Semiconductor device and semiconductor system including the same

文档序号：1345385 发布日期：2020-07-21 浏览：8次中文

阅读说明：本技术 半导体器件及包括半导体器件的半导体系统 (Semiconductor device and semiconductor system including the same ) 是由金光淳于 2019-09-29 设计创作，主要内容包括：本申请公开了一种半导体器件及包括半导体半导体器件的半导体系统。一种半导体系统包括第一半导体器件和第二半导体器件。第一半导体器件输出芯片选择信号、命令/地址信号和时钟信号。第一半导体器件在测试模式下的写入操作期间输出第一外部数据和选通信号,并且在测试模式下的读取操作期间接收第二外部数据以调整选通信号的输出时刻。第二半导体器件根据芯片选择信号和命令/地址信号而在写入操作期间同步于选通信号来锁存从第一外部数据产生的输入数据。第二半导体器件根据芯片选择信号和命令/地址信号而在读取操作期间从输入数据产生输出数据并将输出数据输出作为第二外部数据。(The application discloses a semiconductor device and a semiconductor system including the same. A semiconductor system includes a first semiconductor device and a second semiconductor device. The first semiconductor device outputs a chip select signal, a command/address signal, and a clock signal. The first semiconductor device outputs first external data and a strobe signal during a write operation in a test mode, and receives second external data to adjust an output timing of the strobe signal during a read operation in the test mode. The second semiconductor device latches input data generated from the first external data in synchronization with the strobe signal during a write operation according to the chip select signal and the command/address signal. The second semiconductor device generates output data from the input data and outputs the output data as second external data during a read operation according to the chip select signal and the command/address signal.)

1. A semiconductor system, comprising:

a first semiconductor device configured to output a chip selection signal, a command/address signal, and a clock signal, configured to output first external data and a strobe signal during a write operation in a test mode, and configured to receive second external data to adjust an output timing of the strobe signal during a read operation in the test mode; and

a second semiconductor device configured to latch input data generated from the first external data in synchronization with the strobe signal during the write operation according to the chip select signal and the command/address signal, and configured to generate output data from the input data and output the output data as the second external data during the read operation according to the chip select signal and the command/address signal.

2. The semiconductor system of claim 1, wherein the test mode is an operation mode for adjusting an output timing of the strobe signal and the first external data, the output timing determining a point in time for detecting a logic level of the first external data.

3. The semiconductor system of claim 1, wherein the write operation and the read operation are performed sequentially in the test mode.

4. The semiconductor system of claim 1, wherein the second semiconductor device comprises:

a control circuit configured to generate a write test signal, a read test signal, and a read enable signal in synchronization with the clock signal according to a logic level combination of the chip select signal and the command/address signal, and configured to delay the read test signal in synchronization with the clock signal to generate a read test delay signal;

a control signal generation circuit configured to generate an input control signal that is enabled according to the write test signal, the read test signal, and the read enable signal, and configured to generate an output control signal that is enabled when the read test delay signal is input to the control signal generation circuit; and

a data input/output I/O circuit configured to latch the input data in synchronization with the strobe signal to generate write data loaded on an I/O line, configured to latch read data generated from the write data loaded on the I/O line when the input control signal is input to the data I/O circuit, and configured to generate the output data from the latched read data when the output control signal is input to the data I/O circuit.

5. The semiconductor system of claim 4, wherein the control signal generation circuit comprises:

an input control signal generation circuit configured to: inhibiting the read test signal from being input to the input control signal generation circuit when the read enable signal is input to the input control signal generation circuit, and configured to generate the input control signal that is enabled according to a write/read pulse signal when the write test signal is input to the input control signal generation circuit; and

an output control signal generation circuit configured to generate the output control signal, the output control signal being enabled when the read test delay signal is input to the output control signal generation circuit.

6. The semiconductor system of claim 5, wherein the input control signal generation circuit comprises:

an internal input control signal generation circuit configured to: inhibiting the read test signal from being input to the internal input control signal generation circuit when the read enable signal is input to the internal input control signal generation circuit, and configured to generate an internal input control signal that is enabled when the write test signal is input to the internal input control signal generation circuit; and

an input control signal output circuit configured to generate the input control signal, the input control signal being enabled according to the write/read pulse signal when the internal input control signal is input to the input control signal output circuit.

7. The semiconductor system of claim 5, wherein the output control signal generation circuit comprises:

an internal output control signal generation circuit configured to generate an internal output control signal that is enabled when the read test delay signal is input to the internal output control signal generation circuit; and

an output control signal output circuit configured to generate the output control signal, the output control signal being enabled when the internal output control signal is input to the output control signal output circuit.

8. The semiconductor system of claim 4, wherein the data I/O circuit comprises:

a data input circuit configured to: latching the input data in synchronization with the strobe signal to generate the write data transmitted through the I/O line when the write test signal is input to the data input circuit; and

a data output circuit configured to: latch the read data generated from the write data when the write test signal is enabled and the input control signal is input to the data output circuit, and configured to: the output data is generated from the latched read data when the output control signal is input to the data output circuit.

9. The semiconductor system of claim 8, wherein the data input circuit comprises:

an input buffer configured to buffer the input data to generate write transfer data when the write test signal is enabled; and

a write transfer circuit configured to latch the write transfer data in synchronization with the strobe signal and generate the write data from the latched write transfer data.

10. The semiconductor system of claim 8, wherein the data output circuit comprises:

a read transfer circuit configured to buffer the read data to generate read transfer data when the write test signal is enabled;

a pipeline circuit configured to latch the read transmit data when the input control signal is enabled and configured to generate latched data from the latched read transmit data when the output control signal is enabled; and

an output buffer configured to buffer the latched data to generate the output data.

11. A semiconductor device, comprising:

a control signal generation circuit configured to generate an input control signal that is enabled during a write operation in a test mode and configured to generate an output control signal that is enabled during a read operation in the test mode; and

a data input/output (I/O) circuit configured to: generating write data from input data in synchronization with a strobe signal to transmit the write data to an I/O line, configured to: store read data generated from the write data transmitted to the I/O line when the input control signal is input to the data I/O circuit, and configured to: when the output control signal is input to the data I/O circuit, the stored read data is output as output data.

12. The semiconductor device according to claim 11, wherein the write operation and the read operation are sequentially performed in the test mode.

13. The semiconductor device according to claim 11, wherein the test mode is an operation mode for adjusting a generation timing of the strobe signal and an input timing of the input data when a logic level combination of the output data is different from a logic level combination of the input data.

14. The semiconductor device according to claim 11, wherein the control signal generation circuit comprises:

an input control signal generation circuit configured to: inhibiting a read test signal from being input to the input control signal generation circuit when a read enable signal is input to the input control signal generation circuit and configured to generate the input control signal, the input control signal being enabled according to a write/read pulse signal when a write test signal is input to the input control signal generation circuit; and

an output control signal generation circuit configured to generate the output control signal, the output control signal being enabled when a read test delay signal is input to the output control signal generation circuit.

15. The semiconductor device as set forth in claim 14,

wherein the write test signal, the read test signal, and the read enable signal are enabled according to a logic level combination of command/address signals provided by an external device; and

wherein the read test delay signal is generated by delaying the read test signal.

16. The semiconductor device of claim 15, wherein the input control signal generation circuit comprises:

17. The semiconductor device according to claim 15, wherein the output control signal generation circuit comprises:

18. The semiconductor device according to claim 11, wherein the data I/O circuit comprises:

a data input circuit configured to: latching the input data in synchronization with the strobe signal to generate the write data transmitted through the I/O line when a write test signal is input to the data input circuit; and

19. The semiconductor device of claim 18, wherein the data input circuit comprises:

an input buffer configured to buffer the input data to generate write transfer data when the write test signal is enabled; and

a write transfer circuit configured to latch the write transfer data in synchronization with the strobe signal and generate the write data from the latched write transfer data.

20. The semiconductor device according to claim 18, wherein the data output circuit comprises:

a read transfer circuit configured to buffer the read data to generate read transfer data when the write test signal is enabled;

an output buffer configured to buffer the latched data to generate the output data.

Technical Field

Embodiments of the present disclosure generally relate to a semiconductor device related to a test mode and a semiconductor system including the semiconductor device.

Background

Generally, a semiconductor memory device such as a double data rate synchronous dynamic random access memory (DDR SDRAM) device is configured to perform a read operation or a write operation according to a command provided from an external chipset device. In order for the semiconductor memory devices to perform a read operation or a write operation, each semiconductor memory device may be designed to include various internal circuits, particularly a pipe latch circuit for effectively controlling a large amount of data.

In addition, semiconductor memory devices have been designed to synchronize a read operation or a write operation with respect to data used in the read operation or the write operation using a strobe signal. In this case, in order to prevent an error from occurring during a read operation or a write operation, the semiconductor memory device is designed to operate in a test mode for controlling the generation timings of data and strobe signals prior to the read operation or the write operation.

Disclosure of Invention

According to one embodiment, a semiconductor system may include a first semiconductor device and a second semiconductor device. The first semiconductor device may be configured to output a chip select signal, a command/address signal, and a clock signal. The first semiconductor device may be configured to output first external data and a strobe signal during a write operation in a test mode, and receive second external data to adjust an output timing of the strobe signal during a read operation in the test mode. The second semiconductor device may latch input data generated from the first external data in synchronization with the strobe signal during the write operation according to the chip select signal and the command/address signal. The second semiconductor device may be configured to generate output data from input data and output the output data as second external data during a read operation according to a chip select signal and a command/address signal.

According to one embodiment, a semiconductor device may include a control signal generation circuit and a data input/output (I/O) circuit. The control signal generation circuit may be configured to generate an input control signal that is enabled during a write operation in a test mode and to generate an output control signal that is enabled during a read operation in the test mode. The data input/output (I/O) circuitry may be configured to: write data is generated from input data in synchronization with a strobe signal to transfer the write data to the I/O lines. The data I/O circuitry may be configured to: when the input control signal is input to the data I/O circuit, read data generated from write data transmitted to the I/O line is stored, and when the output control signal is input to the data I/O circuit, the stored read data may be output as output data.

Drawings

Fig. 1 is a block diagram illustrating a configuration of a semiconductor system according to one embodiment of the present disclosure.

Fig. 2 is a table illustrating an operation of a control circuit included in the semiconductor system of fig. 1.

Fig. 3 is a block diagram showing a configuration of a control signal generation circuit included in the semiconductor system of fig. 1.

Fig. 4 is a circuit diagram showing a configuration of an input control signal generation circuit included in the control signal generation circuit of fig. 3.

Fig. 5 is a circuit diagram showing a configuration of an output control signal generation circuit included in the control signal generation circuit of fig. 3.

Fig. 6 is a block diagram illustrating a configuration of a data input/output (I/O) circuit included in the semiconductor system of fig. 1.

Fig. 7 is a circuit diagram showing a configuration of an input buffer included in the data I/O circuit of fig. 6.

Fig. 8 is a circuit diagram showing a configuration of a read transfer circuit included in the data I/O circuit of fig. 6.

Fig. 9 shows a configuration of a pipe circuit included in the data I/O circuit of fig. 6.

Figure 10 is a timing diagram illustrating the operation of a semiconductor system according to one embodiment of the present disclosure.

Fig. 11 is a block diagram showing a configuration of an electronic system employing the semiconductor system shown in fig. 1 to 10.

Detailed Description

Various embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. However, the embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure.

As shown in fig. 1, a semiconductor system 1 according to one embodiment may include a first semiconductor device 10 and a second semiconductor device 20.

The first semiconductor device 10 may output a chip select signal CS, first to sixth command/address signals CA <1:6> and a clock signal C L K. when a write operation is performed in a test mode, the first semiconductor device 10 may output an external data ED and a strobe signal DQS. in one embodiment, the test mode is an operation mode for adjusting output timings of the strobe signal and the first external data, the output timing determining a point in time for detecting a logic level of the first external data. in one embodiment, the test mode is an operation mode for adjusting a generation timing of the strobe signal and an input timing of the input data when a combination of logic levels of the output data is different from a combination of logic levels of the input data. in some embodiments, when the semiconductor system 1 is in the test mode, the write operation and the read operation are performed sequentially. when the write operation is performed in the test mode, the first semiconductor device 10 may receive an external data ED. if a combination of logic levels of the external data input to the first semiconductor device 10 during a read operation in the test mode is performed, the external data ED may be output from the first semiconductor device 10 if the external data ED combined with the first semiconductor device 10 during the read operation in the test mode, the external data ED may be output from the first semiconductor device 10, the external data ED 10 may be output data ED and the external data ED, if the external data ED signal is not output from the first semiconductor device 10 may be output when the combination of the test mode.

The second semiconductor device 20 may include: first to fifth pads P1, P2, P3, P4 and P5, a control circuit 100, a control signal generation circuit 200, a data I/O circuit 300, an I/O line group 400 and a memory circuit 500.

The chip select signal CS may be input to the control circuit 100 through the first pad P1 the first to sixth command/address signals CA <1:6> may be input to the control circuit 100 through the second pad P2 the clock signal C L K may be input to the control circuit 100 through the third pad P3 during a write operation in the test mode, the external data ED may be input to the data I/O circuit 300 as the input data DIN through the fourth pad P4 when a read operation is performed in the test mode, the data I/O circuit 300 may generate the output data DOUT, and the output data DOUT generated by the data I/O circuit 300 may be input to the first semiconductor device 10 as the external data ED through the fourth pad P4 the strobe signal DQS may be input to the data I/O circuit 300 through the fifth pad P5 although the second pad P2 is shown as a single pad in fig. 1, the second pad P2 may be configured to include a number of bits equal to the number of the address signals CA <6 bits included in the first command/address signals CA <1:6 >.

The control circuit 100 may generate the read signal RD, the write test signal WTF, and the read test signal RDF in synchronization with the clock signal C L K according to a logic level combination of the chip select signal CS and the first to sixth command/address signals CA <1:6 >. the control circuit 100 may generate the read enable signal RDEN which is enabled if the read test signal RDF is generated, the control circuit 100 may delay the read signal RD in synchronization with the clock signal C L K to generate the read delay signal RD _ R L, the control circuit 100 may delay the read test signal RDF in synchronization with the clock signal C L K to generate the read test delay signal RDF _ R L, the chip select signal CS and the first to sixth command/address signals wrf for generating the read signal RD, the write test signal WTF, and the read test signal RDF in the control circuit 100 and the logic level combination of the first to sixth command/address signals CA <1:6> will be described with reference to fig. 2.

The control signal generating circuit 200 may generate first to fourth input control signals PIN <1:4> that are enabled according to the read signal RD, the write test signal WTF, the read test signal RDF, and the read enable signal RDEN, and the control signal generating circuit 200 may generate first to fourth output control signals POUT <1:4>, that are enabled if the read delay signal RD _ R L and the read test delay signal RDF _ R L are input to the control signal generating circuit 200, the wrcontrol signal generating circuit 200 may generate the first to fourth output control signals POUT <1:4> that are enabled if the read delay signal RD _ R L and the read test delay signal RDF _ R L are input to the control signal generating circuit 200, that are enabled if any one of the read signal RD > and the write test signal WTF is input to the control signal generating circuit 200, that are sequentially delayed from the read pulse generation signal RD <1:4> to the fourth output control signal POUT <1:4> that are sequentially delayed from the read pulse generation signal RD <1:4> to the read pulse generation circuit may generate the read control signal R <1:4> that are sequentially output from the read pulse generation control signal R <1:4> to the read control signal generating circuit 200, and the read pulse generation control signal R <4> to output control signal R <1:4> that are sequentially delayed from the read control signal generation circuit may be enabled if the read control signal generating circuit 83.

The data I/O circuit 300 may latch the input data DIN in synchronization with the strobe signal DQS to generate the write data WDIN. If the write test signal WTF is input to the data I/O circuit 300, the data I/O circuit 300 may generate the write data WDIN from the input data DIN in synchronization with the strobe signal DQS. Write data WDIN may be transferred through any one of the plurality of I/O lines GIO1 GIOn included in the I/O line group 400. If the first to fourth input control signals PIN <1:4> are input to the data I/O circuit 300, the data I/O circuit 300 may latch read data RDOUT generated from write data WDIN transferred through any one of the plurality of I/O lines GIO1 GIOn. If any one of the write test signal WTF and the read signal RD is input to the data I/O circuit 300, the data I/O circuit 300 may generate the output data DOUT from the read data RDOUT in synchronization with the strobe signal DQS. If the first to fourth output control signals POUT <1:4> are input to the data I/O circuit 300, the data I/O circuit 300 may generate the output data DOUT from the latched read data RDOUT.

When a write operation is performed in the normal mode, the memory circuit 500 may store an internal data ID generated from write data WDIN transferred through the I/O lines GIO1 GIOn. When a read operation is performed in the normal mode, the memory circuit 500 may output the stored internal data ID through the I/O lines GIO1 GIOn.

The combination of logic levels of the chip select signal CS and the first through sixth command/address signals CA <1:6> used to generate the read signal RD, the write test signal WTF, and the read test signal RDF in the control circuit 100 will be described below with reference to FIG. 2, "H" represents a logic "high" level and "L" represents a logic "low" level in FIG. 2 additionally, "X" represents an "don't care state". high and low levels as used herein with respect to signals refer to the logic levels of the signals.

First, the logic level combinations of the chip select signal CS and the first to sixth command/address signals CA <1:6> for generating the read signal RD may be set by way of example, in which the chip select signal CS and the first to fifth command/address signals CA <1:5> inputted in synchronization with the rising edge of the clock signal C L K have a logic "high" level, a logic "low" level, and a logic "low" level, respectively.

Next, the logic level combinations of the chip select signal CS and the first to sixth command/address signals CA <1:6> for generating the write test signal WTF may be set by way of example, in which the first to sixth command/address signals CA <1:6> inputted in synchronization with the rising edge of the clock signal C L K have a logic "low" level, and a logic "high" level, respectively, when the chip select signal CS has a logic "high" level, and the first to sixth command/address signals CA <1:6> inputted in synchronization with the rising edge of the clock signal C L K have a logic "high" level, a logic "low" level, and a logic "low" level, respectively, when the chip select signal CS has a logic "low" level.

Next, the logic level combinations of the chip select signal CS and the first to sixth command/address signals CA <1:6> for generating the read test signal RDF may be set by way of example, in which the first to sixth command/address signals CA <1:6> inputted in synchronization with the rising edge of the clock signal C L K have logic "low" levels, and logic "high" levels, respectively, when the chip select signal CS has a logic "high" level, and the first to sixth command/address signals CA <1:6> inputted in synchronization with the rising edge of the clock signal C L K have logic "high" levels, logic "low" levels, and logic "low" levels, respectively, when the chip select signal CS has a logic "low" level.

Referring to fig. 3, the control signal generation circuit 200 may include an input control signal generation circuit 210 and an output control signal generation circuit 220.

The input control signal generation circuit 210 may generate first to fourth input control signals PIN <1:4> that are enabled according to the write/read pulse signal WRP if the read signal RD is input to the input control signal generation circuit 210. The input control signal generation circuit 210 may prohibit the read test signal RDF from being input to the input control signal generation circuit 210 if the read enable signal RDEN is input to the input control signal generation circuit 210. The input control signal generation circuit 210 may generate first to fourth input control signals PIN <1:4> that are enabled according to the write/read pulse signal WRP if the write test signal WTF is input to the input control signal generation circuit 210. The input control signal generation circuit 210 may generate the first to fourth input control signals PIN <1:4>, which are sequentially enabled if any one of the read signal RD and the write test signal WTF is input to the input control signal generation circuit 210.

The output control signal generation circuit 220 may generate first to fourth output control signals POUT <1:4>, which are enabled if the read delay signal RD _ R L is input to the output control signal generation circuit 220, the output control signal generation circuit 220 may generate the first to fourth output control signals POUT <1:4>, which are enabled if the read test delay signal RDF _ R L is input to the output control signal generation circuit 220, the first to fourth output control signals POUT <1:4> which are enabled if any one of the read delay signal RD _ R L and the read test delay signal RDF _ R L is input to the output control signal generation circuit 220, the output control signal generation circuit 220 may generate the first to fourth output control signals POUT <1:4>, which are sequentially enabled if any one of the read delay signal RD _ R L and the read test delay signal RDF _ R L is input to the output control signal generation circuit 220.

Referring to fig. 4, the input control signal generation circuit 210 may include an internal input control signal generation circuit 211 and an input control signal output circuit 212.

The internal input control signal generation circuit 211 may include a transmission control signal generation circuit 2111 and a signal transmission circuit 2112.

The transmission control signal generation circuit 2111 may be configured to perform an inversion operation, a NAND operation, and a NOR operation, and may be implemented using, for example, but not limited to, inverters IV11, IV12, and IV13, a NAND gate NAND11, and a NOR gate NOR 11. If the read enable signal RDEN having a logic "high" level is input to the transfer control signal generation circuit 2111, the transfer control signal generation circuit 2111 may inhibit the read test signal RDF from being input to the transfer control signal generation circuit 2111. If the write test signal WTF is enabled to have a logic "low" level, the transmission control signal generation circuit 2111 may generate the transmission control signal TCON having a logic "low" level. The transmission control signal generation circuit 2111 may generate the transmission control signal TCON having a logic "high" level if both the read test signal RDF and the read enable signal RDEN have a logic "low" level and the write test signal WTF has a logic "high" level.

If the transmission control signal TCON having a logic "low" level is input to the signal transmission circuit 2112, the signal transmission circuit 2112 can generate the internal input control signal ICON having a logic "low" level. If the read signal RD having a logic "high" level is input to the signal transfer circuit 2112, the signal transfer circuit 2112 may generate the internal input control signal ICON having a logic "low" level. The signal transfer circuit 2112 may generate the internal input control signal ICON having a logic "high" level if the transfer control signal TCON has a logic "high" level and the read signal RD has a logic "low" level.

As described above, the internal input control signal generation circuit 211 may prohibit the read test signal RDF from being input to the internal input control signal generation circuit 211 and generate the internal input control signal ICON if the read enable signal RDEN is input to the internal input control signal generation circuit 211, which is enabled if any one of the read signal RD and the write test signal WTF is input to the internal input control signal generation circuit 211.

The input control signal output circuit 212 may include a transmission signal generating circuit 2121 and a logic circuit 2122.

The transmission signal generating circuit 2121 may be implemented using, for example, but not limited to, flip-flops FF11, FF12, FF13, and FF 14.

The flip-flop FF11 may generate the first transmission signal TS <1>, which is initialized to have a logic "high" level if the reset signal RST is enabled. If the internal input control signal ICON has a logic "low" level, the flip-flop FF11 may output the fourth transmission signal TS <4> as the first transmission signal TS <1 >.

The flip-flop FF12 may generate the second transfer signal TS <2>, and if the reset signal RST is enabled, the second transfer signal TS <2> is initialized to have a logic "low" level. If the internal input control signal ICON has a logic "low" level, the flip-flop FF12 may output the first transmission signal TS <1> as the second transmission signal TS <2 >.

The flip-flop FF13 may generate the third transfer signal TS <3>, which is initialized to have a logic "low" level if the reset signal RST is enabled. If the internal input control signal ICON has a logic "low" level, the flip-flop FF13 may output the second transfer signal TS <2> as the third transfer signal TS <3 >.

The flip-flop FF14 may generate the fourth transfer signal TS <4>, which is initialized to have a logic "low" level if the reset signal RST is enabled. If the internal input control signal ICON has a logic "low" level, the flip-flop FF14 may output the third transfer signal TS <3> as the fourth transfer signal TS <4 >.

The reset signal RST may be enabled to perform an initialization operation of the semiconductor system 1.

The logic circuit 2122 may be configured to perform NAND operations and inversion operations and may be implemented using, for example, but not limited to, NAND gates NAND13, NAND14, NAND15, and NAND16 and inverters IV16, IV17, IV18, and IV 19.

The NAND gate NAND13 and the inverter IV16 may be coupled in series, and if the write/read pulse signal WRP has a logic "high" level, the NAND gate NAND13 and the inverter IV16 may buffer the first transmission signal TS <1> to generate the first input control signal PIN <1 >.

The NAND gate NAND14 and the inverter IV17 may be coupled in series, and if the write/read pulse signal WRP has a logic "high" level, the NAND gate NAND14 and the inverter IV17 may buffer the second transfer signal TS <2> to generate the second input control signal PIN <2 >.

The NAND gate NAND15 and the inverter IV18 may be coupled in series, and if the write/read pulse signal WRP has a logic "high" level, the NAND gate NAND15 and the inverter IV18 may buffer the third transfer signal TS <3> to generate the third input control signal PIN <3 >.

The NAND gate NAND16 and the inverter IV19 may be coupled in series, and if the write/read pulse signal WRP has a logic "high" level, the NAND gate NAND16 and the inverter IV19 may buffer the fourth transfer signal TS <4> to generate the fourth input control signal PIN <4 >.

Referring to fig. 5, the output control signal generation circuit 220 may include an internal output control signal generation circuit 221 and an output control signal output circuit 222.

The internal output control signal generation circuit 221 may be configured to perform a NOR operation and an inversion operation, and may be implemented using, for example, but not limited to, a NOR gate NOR21 and an inverter IV21 coupled in series, if any one of the read delay signal RD _ R L and the read test delay signal RDF _ R L has a logic "high" level, the internal output control signal generation circuit 221 may generate the internal output control signal OCON having a logic "high" level.

The output control signal output circuit 222 may be implemented using flip-flops FF21, FF22, FF23, and FF 24.

The flip-flop FF21 may generate the first output control signal POUT <1>, which is initialized to have a logic "high" level if the reset signal RST is enabled. If the internal output control signal OCON has a logic "high" level, the flip-flop FF21 may output the fourth output control signal POUT <4> as the first output control signal POUT <1 >.

The flip-flop FF22 may generate the second output control signal POUT <2>, which is initialized to have a logic "low" level if the reset signal RST is enabled. If the internal output control signal OCON has a logic "high" level, the flip-flop FF22 may output the first output control signal POUT <1> as the second output control signal POUT <2 >.

The flip-flop FF23 may generate the third output control signal POUT <3>, which is initialized to have a logic "low" level if the reset signal RST is enabled. If the internal output control signal OCON has a logic "high" level, the flip-flop FF23 may output the second output control signal POUT <2> as the third output control signal POUT <3 >.

The flip-flop FF24 may generate the fourth output control signal POUT <4>, which is initialized to have a logic "low" level if the reset signal RST is enabled. If the internal output control signal OCON has a logic "high" level, the flip-flop FF24 may output the third output control signal POUT <3> as the fourth output control signal POUT <4 >.

Referring to fig. 6, the data I/O circuit 300 may include a data input circuit 310 and a data output circuit 320.

The data input circuit 310 may include an input buffer 311 and a write transfer circuit 312.

If the write test signal WTF is enabled, the input buffer 311 may buffer the input data DIN to generate the write transmission data WTD. If the write test signal WTF is enabled, the input buffer 311 may generate write transmission data WTD driven according to a logic level of the input data DIN.

The write transmission circuit 312 may latch the write transmission data WTD in synchronization with the strobe signal DQS and generate the write data WDIN from the latched data of the write transmission data WTD. At the point in time when the strobe signal DQS is toggled, the write transmission circuit 312 may detect the logic level of the write transmission data WTD to generate the write data WDIN. For example, if the write transmission data WTD has a logic "high" level at a time point when the strobe signal DQS is toggled, the write transmission circuit 312 may generate the write data WDIN having a logic "high" level.

Data output circuitry 320 may include read transmit circuitry 321, pipeline circuitry 322, and output buffer 323.

If the read signal RD is enabled, the read transfer circuit 321 may buffer the read data RDOUT to generate the read transfer data RTD. The read transfer circuit 321 may buffer the read data RDOUT to generate the read transfer data RTD if the write test signal WTF is enabled.

Pipeline circuit 322 may latch read transmit data RTD if first through fourth input control signals PIN <1:4> are enabled, pipeline circuit 322 may generate latch data L D from the latch data of read transmit data RTD if first through fourth output control signals POUT <1:4> are enabled.

The output buffer 323 may buffer the latch data L D to generate the output data DOUT the output buffer 323 may generate the output data DOUT driven according to a logic level of the latch data L D.

Referring to fig. 7, the input buffer 311 may include a pull-up/pull-down signal generating circuit 3111 and a driving circuit 3112.

The pull-up/down signal generation circuit 3111 may be configured to perform an inversion operation and a NAND operation, and may be implemented using, for example, but not limited to, an inverter IV31 and NAND gates NAND31 and NAND 32. The pull-up/pull-down signal generation circuit 3111 may generate the pull-up signal PU or the pull-down signal PD according to a logic level of the write test signal WTF and a logic level of the input data DIN. The pull-up/down signal generation circuit 3111 may generate the pull-up signal PU that is enabled to have a logic "low" level if the write test signal WTF has a logic "low" level and the input data DIN has a logic "high" level. The pull-up/down signal generation circuit 3111 may generate the pull-down signal PD enabled to have a logic "high" level if the write test signal WTF has a logic "low" level and the input data DIN has a logic "low" level.

The driving circuit 3112 may be implemented using, for example, but not limited to, a PMOS transistor P31 coupled between the power supply voltage VDD terminal and the node nd31, and an NMOS transistor N31 coupled between the node nd31 and the ground voltage VSS terminal. If the pull-up signal PU is enabled to have a logic "low", the driving circuit 3112 may pull up the node nd31 to the level of the power supply voltage VDD to generate the write transmission data WTD having a logic "high" level. If the pull-down signal PD is enabled to have a logic "high" level, the driving circuit 3112 may pull down the node nd31 to the level of the ground voltage VSS to generate the write transmission data WTD having a logic "low" level.

Referring to fig. 8, the read transmission circuit 321 may include an enable signal generation circuit 3211 and a read transmission data generation circuit 3212.

The enable signal generation circuit 3211 may be configured to perform an inversion operation and a NOR operation, and may be implemented using, for example, but not limited to, inverters IV41 and IV42 and a NOR gate NOR 41. The enable signal generation circuit 3211 may generate an enable signal EN that is enabled if any one of the read signal RD and the write test signal WTF is enabled. If the read signal RD having a logic "high" level is input to the enable signal generation circuit 3211, the enable signal generation circuit 3211 may generate the enable signal EN enabled to have a logic "high" level. If the write test signal WTF having a logic "low" level is input to the enable signal generation circuit 3211, the enable signal generation circuit 3211 may generate the enable signal EN enabled to have a logic "high" level.

The read transfer data generation circuit 3212 may be configured to perform a NAND operation and an inversion operation, and may be implemented using, for example, but not limited to, a NAND gate NAND42 and an inverter IV 43. The read transfer data generation circuit 3212 may buffer the read data RDOUT to generate the read transfer data RTD if the enable signal EN is enabled to have a logic "high" level. If the enable signal EN is disabled to have a logic "low" level, the read transfer data generation circuit 3212 may disable the input of the read data RDOUT to generate the read transfer data RTD having a logic "low" level.

Referring to fig. 9, pipeline circuit 322 may include first pipeline latch 3221, second pipeline latch 3222, third pipeline latch 3223, and fourth pipeline latch 3224.

The first pipe latch 3221 may be configured to perform an inversion operation, and may be implemented using, for example and without limitation, inverters IV51, IV52, IV53, and IV54, if the first input control signal PIN <1> is enabled to have a logic "high" level, the first pipe latch 3221 may receive the read transfer data RTD to generate the stored data SD. if the first input control signal PIN <1> is enabled to have a logic "high" level, the first pipe latch 3221 may inverse buffer the read transfer data RTD to generate the stored data SD. if the first output control signal POUT <1> is enabled to have a logic "high" level, the first pipe latch 3221 may generate the latched data L D from the stored data SD, if the first output control signal POUT <1> is enabled to have a logic "high" level, the first pipe latch 3221 may inverse buffer the stored data 32284D to generate the latched data L D.

Each of second pipeline latch 3222, third pipeline latch 3223, and fourth pipeline latch 3224 may be implemented using substantially the same circuitry as first pipeline latch 3221 except for its I/O signals. Therefore, descriptions of the second to fourth pipeline latches 3222, 3223, and 3224 will be omitted hereinafter.

The operation of the semiconductor system 1 according to an embodiment will be described below with reference to fig. 10 in conjunction with an example in which a read operation in the normal mode, a write operation in the test mode, and a read operation in the test mode are continuously performed.

At a time point "T1", the first semiconductor device 10 may output the chip select signal CS, the first to sixth command/address signals CA <1:6> and the clock signal C L K to perform a read operation, in which case the chip select signal CS and the first to fifth command/address signals CA <1:5> may be output in synchronization with a rising edge of the clock signal C L K to have a logic "high (H)" level, a logic "low (L)" level, a logic "high (H)" level, a logic "low (L)" level, a logic "low (L)" level and a logic "low (L)" level, respectively.

At a time point "T2", the control circuit 100 may generate the read signal RD including a pulse having a logic "high" level in synchronization with the clock signal C L K according to a logic level combination of the chip select signal CS and the first to fifth command/address signals CA <1:5> input to the control circuit 100 at the time point "T1".

The control signal generation circuit 200 may generate the first input control signal PIN <1> enabled to have a logic "high" level according to the read signal RD having a logic "high" level.

During a read operation, the memory circuit 500 may output the internal data ID stored therein as read data RDOUT through any one of the I/O lines GIO1 to GIOn.

The data I/O circuit 300 may latch the read data RDOUT transferred through any one of the I/O lines GIO1 GIOn according to the first input control signal PIN <1> having a logic "high" level.

At a time point "T3", the control circuit 100 may delay the read signal RD at the time point "T2" in synchronization with the clock signal C L K to generate the read delay signal RD _ R L including a pulse having a logic "high" level.

The control signal generation circuit 200 may generate the first output control signal POUT <1> enabled to have a logic "high" level according to the read delay signal RD _ R L having a logic "high" level.

According to the first output control signal POUT <1> having a logic "high" level, the data I/O circuit 300 may generate the output data DOUT from the read data RDOUT latched at the time point "T2" and may output the output data DOUT as the external data ED through the fourth pad P4.

The first semiconductor device 10 may receive external data ED.

At a time point "T4", the first semiconductor device 10 may output the chip select signal CS, the first to sixth command/address signals CA <1:6> and the clock signal C L K to perform a write operation in the test mode, in which case the chip select signal CS and the first to sixth command/address signals CA <1:6> may be output in synchronization with a rising edge of the clock signal C L K to have a logic "high (H)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level and a logic "high (H)" level, respectively.

At a time point "T5", the first semiconductor device 10 may output the chip select signal CS, the first to sixth command/address signals CA <1:6> and the clock signal C L K to perform a write operation in the test mode, in which case the chip select signal CS and the first to sixth command/address signals CA <1:6> may be output in synchronization with a rising edge of the clock signal C L K to have a logic "low (L)" level, a logic "high (H)" level, a logic "low (L)" level, a logic "low (L)" level and a logic "low (L)" level, respectively.

The first semiconductor device 10 may output external data ED and a strobe signal DQS. The external data ED may be output as the input data DIN through the fourth pad P4.

At a time point "T6", the control circuit 100 may generate the write test signal WTF including a pulse having a logic "low" level in synchronization with the clock signal C L K according to a logic level combination of the chip select signal CS and the first to sixth command/address signals CA <1:6> input to the control circuit 100 at the time points "T4" and "T5".

The control signal generation circuit 200 may generate the second input control signal PIN <2> enabled to have a logic "high" level according to the write test signal WTF having a logic "low" level.

The data I/O circuit 300 may latch the input data DIN in synchronization with the strobe signal DQS to generate the write data WDIN. Write data WDIN may be transferred through any one of I/O lines GIO1 GIOn included in I/O line group 400.

According to the second input control signal PIN <2> having a logic "high" level, the data I/O circuit 300 may latch read data RDOUT generated from the write data WDIN transferred through any one of the I/O lines GIO1 GIOn.

At a time point "T7", the first semiconductor device 10 may output the chip select signal CS, the first to sixth command/address signals CA <1:6> and the clock signal C L K to perform a read operation in the test mode, in which case the chip select signal CS and the first to sixth command/address signals CA <1:6> may be output in synchronization with a rising edge of the clock signal C L K to have a logic "high (H)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level and a logic "high (H)" level, respectively.

At a time point "T8", the first semiconductor device 10 may output the chip select signal CS, the first to sixth command/address signals CA <1:6> and the clock signal C L K to perform a read operation in the test mode, in which case the chip select signal CS and the first to sixth command/address signals CA <1:6> may be output in synchronization with a rising edge of the clock signal C L K to have a logic "low (L)" level, a logic "high (H)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level, a logic "low (L)" level and a logic "low (L)" level, respectively.

At a time point "T9", the control circuit 100 may generate the read test signal RDF including a pulse having a logic "low" level and the read enable signal RDEN having a logic "low" level in synchronization with the clock signal C L K according to logic level combinations of the chip select signal CS and the first to sixth command/address signals CA <1:6> input to the control circuit 100 at the time points "T7" and "T8".

At a time point "T10", the control circuit 100 may delay the read test signal RDF at the time point "T9" in synchronization with the clock signal C L K to generate the read test delay signal RDF _ R L including a pulse having a logic "high" level.

The control signal generation circuit 200 may generate the second output control signal POUT <2> enabled to have a logic "high" level according to the read test delay signal RDF _ R L having a logic "high" level.

According to the second output control signal POUT <2> having a logic "high" level, the data I/O circuit 300 may generate the output data DOUT from the read data RDOUT latched at the time point "T6" and may output the output data DOUT as the external data ED through the fourth pad P4.

If the logic level combination of the external data ED input to the first semiconductor device 10 is different from the logic level combination of the external data ED output from the first semiconductor device 10 at the time point "T5", the first semiconductor device 10 may adjust the generation timing of the external data ED and the strobe signal DQS. Meanwhile, if the logic level combination of the external data ED input to the first semiconductor device 10 is the same as the logic level combination of the external data ED output from the first semiconductor device 10 at the time point "T5", the first semiconductor device 10 may terminate the test mode without adjusting the generation timings of the external data ED and the strobe signal DQS.

Although fig. 10 illustrates the write operation and the read operation performed using the first and second input control signals PIN <1:2> and the first and second output control signals POUT <1:2> in the test mode, the write operation and the read operation performed using the third and fourth input control signals PIN <3:4> and the third and fourth output control signals POUT <3:4> in the test mode may also be performed through substantially the same procedure as described with reference to fig. 10. Therefore, a description of the write operation and the read operation performed using the third and fourth input control signals PIN <3:4> and the third and fourth output control signals POUT <3:4> in the test mode will be omitted hereinafter.

As described above, the semiconductor system according to one embodiment can perform the test mode of adjusting the generation timings of the data and strobe signals without performing the write operation and the read operation using the memory circuit, thereby reducing the operation time of the test mode. In addition, the semiconductor system can directly perform a read operation without any intermediate time after a write operation in the test mode, thereby reducing the run time of the test mode.

The semiconductor system described with reference to fig. 1 to 10 may be applied to an electronic system including a memory system, a graphic system, a computing system, a mobile system, or the like. For example, as shown in FIG. 11, an electronic system 1000 according to one embodiment may include a data storage circuit 1001, a memory controller 1002, a buffer memory 1003, and an input/output (I/O) interface 1004.

The data storage circuit 1001 may store data output from the memory controller 1002 or may read the stored data and output it to the memory controller 1002 according to a control signal output from the memory controller 1002. The data storage circuit 1001 may include the second semiconductor device 20 shown in fig. 1. Meanwhile, the data storage circuits 1001 may include nonvolatile memories capable of retaining data they store even when their power supply is interrupted. The nonvolatile memory may be a flash memory such as a NOR type flash memory or a NAND type flash memory, a phase change random access memory (PRAM), a Resistive Random Access Memory (RRAM), a Spin Transfer Torque Random Access Memory (STTRAM), a Magnetic Random Access Memory (MRAM), or the like.

The memory controller 1002 may receive a command output from an external device (e.g., a host device) through the I/O interface 1004 and may decode the command output from the host device to control an operation for inputting data to the data storage circuit 1001 and the buffer memory 1003 or an operation for outputting data stored in the data storage circuit 1001 and the buffer memory 1003. The memory controller 1002 may include the first semiconductor device 10 shown in fig. 1. Although fig. 11 shows the memory controller 1002 as a single block, the memory controller 1002 may include one controller for controlling the data storage circuit 1001 composed of a nonvolatile memory and another controller for controlling the buffer memory 1003 composed of a volatile memory.

The buffer memory 1003 may temporarily store data to be processed by the memory controller 1002. That is, the buffer memory 1003 may temporarily store data output from the data storage circuit 1001 or to be input to the data storage circuit 1001. The buffer memory 1003 may store data output from the memory controller 1002 according to a control signal. The buffer memory 1003 may read the stored data and output it to the memory controller 1002. The buffer memory 1003 may include a volatile memory such as a Dynamic Random Access Memory (DRAM), a mobile DRAM, or a Static Random Access Memory (SRAM).

The I/O interface 1004 may physically and electrically connect the memory controller 1002 to an external device (i.e., a host). Accordingly, the memory controller 1002 may receive control signals and data from an external device (i.e., a host) through the I/O interface 1004 and may output data output from the memory controller 1002 to the external device (i.e., the host) through the I/O interface 1004. That is, electronic system 1000 may communicate with a host through I/O interfaces 1004. The I/O interface 1004 may include any of a variety of interface protocols such as: universal Serial Bus (USB), multi-media card (MMC), peripheral component interconnect express (PCI-E), serial attached SCSI (sas), serial AT attachment (SATA), parallel AT attachment (PATA), Small Computer System Interface (SCSI), Enhanced Small Device Interface (ESDI), and Integrated Drive Electronics (IDE).

Electronic system 1000 may be used as a secondary storage device or an external storage device for a host. The electronic system 1000 may include a Solid State Disk (SSD), a USB memory, a Secure Digital (SD) card, a mini secure digital (mSD) card, a micro secure digital (micro SD) card, a Secure Digital High Capacity (SDHC) card, a memory stick card, a Smart Media (SM) card, a multimedia card (MMC), an embedded multimedia card (eMMC), or a Compact Flash (CF) card, etc.

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