阅读说明：本技术 一种低成本的pcie热拔插多模式兼容装置 (Low-cost PCIE hot plug multi-mode compatible device ) 是由 陈晶 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种低成本的PCIE热拔插多模式兼容装置,包括延时复位监测模块、第一控制电路、第一电源开关器、供电电源和输入输出串口扩展芯片。其中,输入输出串口扩展芯片的扩展卡在位识别引脚与延时复位监测模块的监测信号输入端相连,输入输出串口扩展芯片的电源使能控制引脚和延时复位监测模块的控制输出端分别与第一控制电路的第一控制信号输入端和第二控制信号输入端相连。第一控制电路的信号输出端与第一电源开关器的控制信号输入端相连,供电电源的供电输出端与第一电源开关器的供电输入端相连,第一电源开关器的第一供电输出端用于连接扩展卡的第一电源输入端。本发明能低成本地让网安设备的PCIE扩展接口具有热拔插功能。(The invention discloses a low-cost PCIE hot plug multi-mode compatible device which comprises a delay reset monitoring module, a first control circuit, a first power switch, a power supply and an input/output serial port expansion chip. The on-position identification pin of the expansion card of the input/output serial port expansion chip is connected with the monitoring signal input end of the delay reset monitoring module, and the power supply enabling control pin of the input/output serial port expansion chip and the control output end of the delay reset monitoring module are respectively connected with the first control signal input end and the second control signal input end of the first control circuit. The signal output end of the first control circuit is connected with the control signal input end of the first power switch, the power supply output end of the power supply is connected with the power supply input end of the first power switch, and the first power supply output end of the first power switch is used for being connected with the first power supply input end of the expansion card. The invention can enable the PCIE expansion interface of the network security equipment to have the hot plug function with low cost.)

1. A low-cost PCIE hot plug multi-mode compatible device is characterized by comprising a delay reset monitoring module, a first control circuit, a first power switch, a power supply and an input/output serial port expansion chip, wherein the input/output serial port expansion chip is connected with a system management bus installed on a network and is connected with an expansion card;

an extension card in-place identification pin of the input/output serial port extension chip is connected with a monitoring signal input end of the delay reset monitoring module, and a power supply enabling control pin of the input/output serial port extension chip and a control output end of the delay reset monitoring module are respectively connected with a first control signal input end and a second control signal input end of the first control circuit;

the signal output end of the first control circuit is connected with the control signal input end of the first power switch, the power supply output end of the power supply is connected with the power supply input end of the first power switch, and the first power supply output end of the first power switch is used for being connected with the first power supply input end of the expansion card.

2. The device of claim 1, further comprising a second control circuit and a second power switch;

a power supply enabling control pin of the input/output serial port extension chip, a control output end of the delay reset monitoring module and a second power supply output end of the first power switch are respectively connected with a first control signal input end, a second control signal input end and a third control signal input end of the second control circuit, and a signal output end of the second control circuit is connected with a control signal input end of the second power switch;

and the power supply output end of the power supply is connected with the power supply input end of the second power switch, and the power supply output end of the second power switch is used for connecting the second power input end of the expansion card.

3. The device of claim 2, wherein the second control circuit comprises a first diode, a second diode, a third diode, and a first resistor;

the cathode of the first diode is connected with a power supply enabling control pin of the input/output serial port expansion chip, the cathode of the second diode is connected with the control output end of the delay reset monitoring module, and the cathode of the third diode is connected with the second power supply output end of the first power supply switch;

one end of the first resistor is simultaneously connected with the anode of the first diode, the anode of the second diode, the anode of the third diode and the control signal input end of the second power switch;

the other end of the first resistor is connected with a power supply output end of the power supply.

4. The device of claim 2, further comprising a first inverting circuit and a tri-state buffer;

the enable end of the tri-state buffer is connected with the signal output end of the second control circuit through the first inverting circuit, the input end of the tri-state buffer is used for connecting a Bypass signal equipped in a network, and the output end of the tri-state buffer is used for connecting an expansion card.

5. The device of claim 2, further comprising a third control circuit and a power monitoring module;

a monitoring signal input end of the power supply monitoring chip is connected with a power supply output end of the second power supply switch, and a signal output end of the power supply monitoring chip and a controllable reset signal pin of the input/output serial port expansion chip are connected with a first control signal input end and a second control signal input end of the third control circuit;

and a third control signal input end of the third control circuit is used for connecting PCIE expansion slot reset signals installed and prepared by a network, and a signal output end of the third control circuit is used for connecting a reset signal input end of an expansion card.

6. The device of claim 5, wherein the third control circuit comprises a fourth diode, a fifth diode, a sixth diode, and a second resistor;

the cathode of the fourth diode is connected with a controllable reset signal pin of the input/output serial port expansion chip, the cathode of the fifth diode is connected with a signal output end of the power supply monitoring chip, and the cathode of the sixth diode is used for connecting a PCIE expansion slot reset signal equipped in a network;

one end of the second resistor is connected with the anode of the fourth diode, the anode of the fifth diode and the anode of the sixth diode at the same time and is used for being connected with a reset signal input end of an expansion card;

the other end of the second resistor is connected with a power supply output end of the power supply.

7. The device of claim 1, wherein the first control circuit comprises a seventh diode, an eighth diode, and a third resistor;

the cathode of the seventh diode is connected with the control output end of the delay reset monitoring module, and the cathode of the eighth diode is connected with the power supply enabling control pin of the input/output serial port expansion chip;

one end of the third resistor is connected with the anode of the seventh diode, the anode of the eighth diode and the control signal input end of the first power switch, and the other end of the third resistor is connected with the power supply output end of the power supply.

8. The device of claim 1, wherein the delay reset monitoring module comprises a second inverting circuit and a delay reset monitoring chip;

the signal input end of the second inverting circuit is connected with the extension card of the input/output serial port extension chip through a bit identification pin, the signal output end of the second inverting circuit is connected with the monitoring signal input end of the delay reset monitoring chip, and the control output end of the delay reset monitoring chip is connected with the second control signal input end of the first control circuit.

9. The device of claim 1, further comprising a key module;

and the output end of the key module is connected with the serial input/output pin of the input/output serial port expansion chip.

10. The device of claim 1, wherein a plurality of sets of expansion card interfaces are disposed on the i/o serial port expansion chip.

Technical Field

The invention relates to the field of network security equipment and power equipment, in particular to a low-cost PCIE hot plug multi-mode compatible device.

Background

With the rapid development of cloud computing and the internet of things, network terminal equipment grows exponentially. The requirements for the security protection of the network terminal are more and more increased, and the complexity is more and more increased. The requirement for diversity of network installation interfaces is also increasing. The existing network installation equipment uses non-standard PCIE (high-speed serial computer expansion bus standard) for expansion, and meets the requirements for different application scenes by replacing different expansion cards. However, in view of cost, the network-installed PCIE expansion interface does not support hot-plug. PCIE expansion on the existing mainstream server can realize hot plug function through manual operation of an entity key or a virtual key, but the design cost is high, and the PCIE expansion is not suitable for network security products.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a low-cost PCIE hot plug multi-mode compatible device can enable a PCIE expansion interface installed on a network to support a hot plug function at low cost.

In order to solve the problems, the invention adopts the following scheme:

a low-cost PCIE hot plug multi-mode compatible device comprises a delay reset monitoring module, a first control circuit, a first power switch, a power supply and an input/output serial port expansion chip, wherein the input/output serial port expansion chip is connected with a system management bus equipped in a network and is connected with an expansion card;

an extension card in-place identification pin of the input/output serial port extension chip is connected with a monitoring signal input end of the delay reset monitoring module, and a power supply enabling control pin of the input/output serial port extension chip and a control output end of the delay reset monitoring module are respectively connected with a first control signal input end and a second control signal input end of the first control circuit;

the signal output end of the first control circuit is connected with the control signal input end of the first power switch, the power supply output end of the power supply is connected with the power supply input end of the first power switch, and the first power supply output end of the first power switch is used for being connected with the first power supply input end of the expansion card.

In conclusion, the beneficial effects of the invention are as follows: the PCIE hot plug multi-mode compatible device with low cost is provided, an input/output serial port expansion chip is used for expanding an interface on a system management bus of network security equipment and connecting an expansion card, and power switch control for automatically controlling the hot plug process of the expansion card is realized through a hardware control circuit consisting of a delay reset monitoring module, a first control circuit and a first power switch, so that the working investment of software is reduced, and the PCIE expansion interface arranged on the network can support the hot plug function with low cost.

Drawings

Fig. 1 is a power control block diagram of a low-cost PCIE hot-plug multi-mode compatible device according to an embodiment of the present invention;

fig. 2 is a reset control block diagram of a low-cost PCIE hot-plug multi-mode compatible device according to an embodiment of the present invention;

fig. 3 is a block diagram of a Bypass signal control of a PCIE hot-plug multi-mode compatible device according to an embodiment of the present invention;

fig. 4 is a schematic circuit connection diagram of a second control circuit of a low-cost PCIE hot-plug multi-mode compatible device according to an embodiment of the present invention;

fig. 5 is a schematic circuit connection diagram of a third control circuit of a low-cost PCIE hot-plug multi-mode compatible device according to an embodiment of the present invention;

fig. 6 is a schematic circuit connection diagram of a first control circuit of a low-cost PCIE hot-plug multi-mode compatible device according to an embodiment of the present invention.

Description of reference numerals:

1. a delay reset monitoring module; 2. a first control circuit; 3. a first power switch; 4. a power supply; 5. an expansion card; 6. an input/output serial port expansion chip; 7. a second control circuit; 8. a second power switch; 9. a first inverting circuit; 10. a tri-state buffer; 11. a second inverting circuit; 12. a third control circuit; 13. a power supply monitoring module; 14. resetting the monitoring chip in a delayed manner; 15. a key module; 16. a non-standard PCIE expansion slot;

d1, a first diode; d2, a second diode; d3, a third diode; d4, a fourth diode; d5, a fifth diode; d6, a sixth diode; d7, a seventh diode; d8, an eighth diode;

r1, a first resistor; r2, a second resistor; r3 and a third resistor.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1 to 6, a low-cost PCIE hot-plug multi-mode compatible device includes a delay reset monitoring module 1, a first control circuit 2, a first power switch 3, a power supply 4, and an input/output serial port expansion chip 6, which is connected to a system management bus installed in a network and is connected to an expansion card 5;

an on-position identification pin of an expansion card 5 of the input/output serial port expansion chip 6 is connected with a monitoring signal input end of the delay reset monitoring module 1, and a power supply enabling control pin of the input/output serial port expansion chip 6 and a control output end of the delay reset monitoring module 1 are respectively connected with a first control signal input end and a second control signal input end of the first control circuit 2;

the signal output end of the first control circuit 2 is connected with the control signal input end of the first power switch device 3, the power supply output end of the power supply 4 is connected with the power supply input end of the first power switch device 3, and the first power supply output end of the first power switch device 3 is used for being connected with the first power supply input end of the expansion card 5.

From the above description, the beneficial effects of the present invention are: the PCIE hot plug multi-mode compatible device with low cost is provided, an input/output serial port expansion chip 6 is used for expanding an interface on a system management bus of network security equipment and is connected with an expansion card 5, and through a hardware control circuit consisting of a delay reset monitoring module 1, a first control circuit 2 and a first power switch 3, power switch control for automatically controlling the hot plug process of the expansion card 5 is realized, the working investment of software is reduced, and the PCIE expansion interface arranged on the network can support the hot plug function with low cost.

Further, a second control circuit 7 and a second power switch 8 are also included;

a power supply enabling control pin of the input/output serial port extension chip 6, a control output end of the delay reset monitoring module 1 and a second power supply output end of the first power switch 3 are respectively connected with a first control signal input end, a second control signal input end and a third control signal input end of the second control circuit 7, and a signal output end of the second control circuit 7 is connected with a control signal input end of the second power switch 8;

and the power supply output end of the power supply 4 is connected with the power supply input end of the second power switch 8, and the power supply output end of the second power switch 8 is used for connecting the second power input end of the expansion card 5.

From the above description, the second control circuit 7 and the second power switch 8 are new control circuits, and are matched with the first power switch 3 to implement automatic power control on the power supply requirements of different states of the expansion card 5, so as to implement the hot plug function of the expansion card 5.

Further, the second control circuit 7 includes a first diode D1, a second diode D2, a third diode D3, and a first resistor R1;

the cathode of the first diode D1 is connected to the power enable control pin of the input/output serial port expansion chip 6, the cathode of the second diode D2 is connected to the control output terminal of the delay reset monitoring module 1, and the cathode of the third diode D3 is connected to the second power supply output terminal of the first power switch 3;

one end of the first resistor R1 is connected to the anode of the first diode D1, the anode of the second diode D2, the anode of the third diode D3 and the control signal input terminal of the second power switch 8 at the same time;

the other end of the first resistor R1 is connected to the power supply output terminal of the power supply 4.

As can be seen from the above description, the second control circuit 7 is a three-terminal input line and circuit composed of the first diode D1, the second diode D2, and other devices; and if and only if the output levels of the power supply enabling control pin of the input/output serial port extension chip 6, the control output end of the delay reset monitoring module 1 and the second power supply output end of the first power switch 3 are all high levels, the control output is realized, strict control logic is realized, a stable and reliable switch control effect is provided for a control circuit, and the stability of the circuit is enhanced.

Further, the circuit also comprises a first inverting circuit 9 and a tri-state buffer 10;

the enable end of the tri-state buffer 10 is connected with the signal output end of the second control circuit 7 through the first inverting circuit 9, the input end of the tri-state buffer 10 is used for connecting a Bypass signal equipped by a network, and the output end of the tri-state buffer 10 is used for connecting the expansion card 5.

From the above description, it can be known that the Bypass signal of the network security device is reasonably controlled through the tri-state buffer 10, the problem that the control circuit does not support hot plug processing of the Bypass signal is effectively solved, the compatibility of the device to the network security device is increased, and more comprehensive hot plug control of the network security device is realized.

Further, the system also comprises a third control circuit 12 and a power supply monitoring module 13;

a monitoring signal input end of the power supply monitoring chip is connected with a power supply output end of the second power supply switch device 8, and a signal output end of the power supply monitoring chip and a controllable reset signal pin of the input/output serial port expansion chip 6 are connected with a first control signal input end and a second control signal input end of the third control circuit 12;

a third control signal input end of the third control circuit 12 is used for connecting a PCIE expansion slot reset signal installed and prepared by the network, and a signal output end of the third control circuit 12 is used for connecting a reset signal input end of the expansion card 5.

As can be seen from the above description, the third control circuit 12 uses a three-terminal input line and circuit, and detects the power-up and power-down states of the expansion card 5 in real time, so as to complete the reset control, find the abnormal state of the device in time, perform the reset processing, and ensure the safe and stable operation of the device.

Further, the third control circuit 12 includes a fourth diode D4, a fifth diode D5, a sixth diode D6, and a second resistor R2;

the cathode of the fourth diode D4 is connected to a controllable reset signal pin of the input/output serial port expansion chip 6, the cathode of the fifth diode D5 is connected to a signal output end of the power supply monitoring chip, and the cathode of the sixth diode D6 is used for connecting a PCIE expansion slot reset signal provided by a network;

one end of the second resistor R2 is connected to the anode of the fourth diode D4, the anode of the fifth diode D5 and the anode of the sixth diode D6 at the same time and is used for connecting the reset signal input end of the expansion card 5;

the other end of the second resistor R2 is connected to the power supply output terminal of the power supply 4.

As can be seen from the above description, the third control circuit 12 adopts a three-terminal input line and circuit, including controllable reset and power-on reset, and has a strict line for logic control, so as to implement automatic stable control of power-on reset and abnormal reset of the expansion card 5, thereby increasing flexibility and convenience of use of the device.

Further, the first control circuit 2 includes a seventh diode D7, an eighth diode D8, and a third resistor R3;

the negative electrode of the seventh diode D7 is connected to the control output terminal of the delay reset monitoring module 1, and the negative electrode of the eighth diode D8 is connected to the power enable control pin of the input/output serial port expansion chip 6;

one end of the third resistor R3 is simultaneously connected to the anode of the seventh diode D7, the anode of the eighth diode D8 and the control signal input terminal of the first power switch 3, and the other end of the third resistor R3 is connected to the power supply output terminal of the power supply 4.

From the above description, the first control circuit 2 is a dual-input line and control circuit, and is matched with the delay reset monitoring module 1 to realize the control effects of fast power off when being pulled out and slow power on when being inserted, so that the basic requirements of hot plug design are met, the jitter elimination function is achieved, and the stability of circuit control is improved.

Further, the delay reset monitoring module 1 includes a second inverting circuit 11 and a delay reset monitoring chip 14;

the signal input end of the second inverting circuit 11 is connected with the on-position identification pin of the expansion card 5 of the input-output serial port expansion chip 6, the signal output end of the second inverting circuit 11 is connected with the monitoring signal input end of the delay reset monitoring chip 14, and the control output end of the delay reset monitoring chip 14 is connected with the first control signal input end.

As can be seen from the above description, the second inverting circuit 11 has a function of changing a signal level, and has flexible and changeable control logic in cooperation with the delayed reset monitoring chip 14, so as to achieve different control effects. The delay reset monitoring chip 14 has a delay function, and realizes jitter elimination processing on the control signal, thereby increasing stability.

Further, a key module 15 is also included;

the output end of the key module 15 is connected with the serial input/output pin of the input/output serial port expansion chip 6.

As can be seen from the above description, the key module 15 inputs a corresponding ground level control signal according to actual needs, so as to implement manual hot plug control, so as to meet different scene requirements.

Furthermore, a plurality of groups of expansion card 5 interfaces are arranged on the input/output serial port expansion chip 6.

As can be seen from the above description, the input/output serial port expansion chip 6 can be accessed to multiple expansion cards 5, and the definition does not need to be modified on the non-standard PCIE expansion slot of the network security device, so as to add additional serial input/output pins and ensure the compatibility of the device.

Referring to fig. 1, a first embodiment of the present invention is:

to better explain the content of the embodiment, the definition of the pins of the input/output serial port expansion chip 6 referred to in fig. 1 to 6 is explained as follows:

(1) PCA9555_ PWR _ EN (controllable Power Enable Pin; 0: OFF; 1: ON)

(2) PCA9555_ RSTN (controllable reset pin; 0: reset; 1: normal)

(3) CARD _ PRSNTN (expansion CARD bit identification pin; 0: in-place; 1: out-of-place)

(4) PCA9555_ GPIOKEY (Serial input output pin; 0: pressed; 1: not operated).

A low-cost PCIE hot plug multi-mode compatible device is disclosed as shown in figure 1 and figure 3, and comprises a delay reset monitoring module 1, a first control circuit 2, a first power switch 3, a power supply 4, a second control circuit 7, a second power switch 8, a first inverting circuit 9, a tri-state buffer 10, a key module 15 and an input-output serial port expansion chip 6 which is connected with a system management bus equipped in a network and is connected with an expansion card 5. The delay reset monitoring module 1 comprises a second inverting circuit 11 and a delay reset monitoring chip 14. The on-position identification pin of the expansion card 5 of the input/output serial port expansion chip 6 is connected with the signal input end of the second inverting circuit 11, the signal output end of the second inverting circuit 11 is connected with the monitoring signal input end of the delay reset monitoring chip 14, and the power supply enabling control pin of the input/output serial port expansion chip 6 and the control output end of the delay reset monitoring chip 14 are respectively connected with the first control signal input end and the second control signal input end of the first control circuit 2. The signal output end of the first control circuit 2 is connected with the control signal input end of the first power switch device 3, the power supply output end of the power supply 4 is connected with the power supply input end of the first power switch device 3, and the first power supply output end of the first power switch device 3 is used for being connected with the first power supply input end of the expansion card 5. The output end of the key module 15 is connected with the serial input/output pin of the input/output serial port expansion chip 6.

As shown in fig. 1, the power enable control pin of the input/output serial port expansion chip 6, the control output terminal of the delay reset monitoring module 1, and the second power supply output terminal of the first power switch 3 are respectively connected to the first control signal input terminal, the second control signal input terminal, and the third control signal input terminal of the second control circuit 7, and the signal output terminal of the second control circuit 7 is connected to the control signal input terminal of the second power switch 8. The power supply output end of the power supply 4 is connected with the power supply input end of the second power switch 8, and the power supply output end of the second power switch 8 is used for being connected with the second power input end of the expansion card 5.

As shown in fig. 3, the enable terminal of the tri-state buffer 10 is connected to the signal output terminal of the second control circuit 7 through the first inverting circuit 9, the input terminal of the tri-state buffer 10 is used for connecting a network-mounted Bypass signal, and the output terminal of the tri-state buffer 10 is used for connecting the expansion card 5. The Bypass signal is the Bypass signal. Also, the first inverting circuit 9 and the second inverting circuit 11 may be composed of a transistor 2N 7002. Specifically, the Bypass signal is accessed to the third control circuit 12 from the non-standard PCIE expansion slot 16 of the network security device.

In this embodiment, the automated insertion process is as follows:

firstly, after the expansion card 5 is inserted, the bit identification pin of the expansion card 5 of the input/output serial port expansion chip 6 is changed into a low level, and then the bit identification pin is changed into a high level through the second negation circuit 11, so as to control the control output end of the delay reset monitoring chip 14 to be a high level, namely, the PWR _ AUTO _ EN signal shown in fig. 1;

secondly, the power supply enabling control pin of the input/output serial port expansion chip 6 is not used and is at a high level; when the power enable control pin of the input/output serial port expansion chip 6 and the control output terminal of the delay reset monitoring chip 14 are both at a high level, the signal output terminal of the first control circuit 2 is at a high level, that is, the PWR _ EN1 signal shown in fig. 1, so that the first power switch 3 is turned on;

then, the power supply output end of the power supply 4 passes through the first power switch 3, is converted into the power supply of 3.3VSB and is output to the expansion card 5 for power supply; at the same time, the output of the second power supply output terminal of the first power switch 3 is pulled high, i.e., the PG _3.3VSB signal shown in fig. 1.

Finally, when the power enable control pin of the input/output serial port expansion chip 6, the control output terminal of the delay reset monitoring chip 14 and the second power supply output terminal of the first power switch 3 are all at high level, the second control circuit 7 outputs high level, that is, PWR _ EN2 signal; the second power switch 8 is turned on; the power supply output end of the power supply 4 is converted by the second power switch 8 to output 12V/3.3V to supply power to the expansion card 5. At the same time. And the tri-state buffer 10 is gated to start the Bypass signal output of the network security equipment.

The automated plucking process is as follows:

firstly, after the expansion card 5 is unplugged, the on-bit identification pin of the expansion card 5 of the input/output serial port expansion chip 6 is changed into a high level, and the on-bit identification pin is changed into a low level after passing through the second inverting circuit 11, so that the control output end of the delay reset monitoring chip 14 is controlled to be the low level;

secondly, the power supply enabling control pin of the input/output serial port expansion chip 6 is not used and is at a high level; when the power enable control pin of the input/output serial port extension chip 6 and the control output end of the delay reset monitoring chip 14 are not all at high level, the signal output end of the first control circuit 2 is at low level, so that the first power switch 3 is turned off;

then, the power supply of the 3.3VSB is stopped; meanwhile, the output of the second power supply output terminal of the first power switch 3 is set low.

Finally, when the power supply enabling control pin of the input/output serial port extension chip 6, the control output end of the delay reset monitoring chip 14 and the second power supply output end of the first power switch 3 are not all at high level, the second control circuit 7 outputs low level; the second power switch 8 is turned off; the tri-state buffer 10 is off; the Bypass signal output of the network security equipment is closed; the power supply module stops supplying power to the expansion card 5.

In addition, the present embodiment is also provided with a manual mode. The manual mode insertion procedure is as follows:

after the expansion card 5 is inserted, the user presses the keys of the key module 15 for a long time; when the input/output serial port expansion chip 6 detects that the serial input/output pin is at a low level for a long time, the expansion card 5 is judged to be in place but not powered, the controllable power supply enabling pin is kept at a high level, and the expansion card 5 is powered on and the Bypass signal is turned on in cooperation with an automatic insertion process.

The process of manual mode plucking is as follows:

when the expansion card 5 needs to be removed, the user presses the keys of the key module 15 for a long time; the input/output serial port expansion chip 6 detects that the serial input/output pin is at a low level for a long time, judges that the expansion card 5 is in place and supplies power, and sets the controllable power supply enable pin to be at a low level, so that the first control circuit 2 and the second control circuit 7 do not have high level output any more, power-off of the expansion card 5 is completed, the Bypass signal is turned off, and then the expansion card 5 can be pulled out.

In the embodiment, the input/output serial port expansion chip 6 is a PCA9555 chip having up to four expansion cards 5. Each expansion card 5 uses 4 signals. In other equivalent embodiments, the input-output serial port expansion chip 6 can also use other models of expansion chips.

Referring to fig. 4 and fig. 6, a second embodiment of the present invention is:

based on the first embodiment, as shown in fig. 4, the second control circuit 7 includes a first diode D1, a second diode D2, a third diode D3, and a first resistor R1. The cathode of the first diode D1 is connected to the power enable control pin of the input/output serial port expansion chip 6, the cathode of the second diode D2 is connected to the control output terminal of the delay reset monitoring module 1, and the cathode of the third diode D3 is connected to the second power supply output terminal of the first power switch 3; one end of the first resistor R1 is connected to the anode of the first diode D1, the anode of the second diode D2, the anode of the third diode D3 and the control signal input terminal of the second power switch 8 at the same time; the other end of the first resistor R1 is connected to the power supply output terminal of the power supply 4.

As shown in fig. 6, the first control circuit 2 includes a seventh diode D7, an eighth diode D8, and a third resistor R3. The negative electrode of the seventh diode D7 is connected to the control output terminal of the delay reset monitoring module 1, and the negative electrode of the eighth diode D8 is connected to the power enable control pin of the input/output serial port expansion chip 6. One end of the third resistor R3 is connected to the anode of the seventh diode D7, the anode of the eighth diode D8 and the control signal input terminal of the first power switch 3, and the other end of the third resistor R3 is connected to the power output terminal of the power supply 4.

In the present embodiment, the first control circuit 2 and the second control circuit 7 both use a wired-and circuit having a diode as a main device. The wired-and circuit outputs a high level only when all input signals are high level.

Referring to fig. 2 and 5, a third embodiment of the present invention is:

a low-cost PCIE hot-plug multi-mode compatible device, based on the first or second embodiment, as shown in fig. 2, further includes a third control circuit 12 and a power monitoring module 13. The monitoring signal input end of the power supply monitoring chip is connected with the power supply output end of the second power supply switch 8, and the signal output end of the power supply monitoring chip and the controllable reset signal pin of the input/output serial port expansion chip 6 are connected with the first control signal input end and the second control signal input end of the third control circuit 12. A third control signal input end of the third control circuit 12 is used for connecting a PCIE expansion slot reset signal installed and prepared by the network, and a signal output end of the third control circuit 12 is used for connecting a reset signal input end of the expansion card 5. The output signal of the signal output end of the power supply monitoring chip is an AUTO _ RSTN signal; the output signal at the signal output of the third control circuit 12 is the RSTN _ CARD signal.

In the present embodiment, specifically, as shown in fig. 5, the third control circuit 12 includes a fourth diode D4, a fifth diode D5, a sixth diode D6, and a second resistor R2. The cathode of the fourth diode D4 is connected to a controllable reset signal pin of the input/output serial port expansion chip 6, the cathode of the fifth diode D5 is connected to a signal output end of the power supply monitoring chip, and the cathode of the sixth diode D6 is used for connecting a PCIE expansion slot reset signal provided by the network; one end of the second resistor R2 is simultaneously connected with the anode of the fourth diode D4, the anode of the fifth diode D5 and the anode of the sixth diode D6 and is used for connecting the reset signal input end of the expansion card 5; the other end of the second resistor R2 is connected to the power supply output terminal of the power supply 4. Specifically, the PCIE expansion slot reset signal is accessed to the third control circuit 12 from the non-standard PCIE expansion slot 16 of the network security device.

In this embodiment, as shown in fig. 5, the third control circuit 12 is a three-terminal input line and signal, and only when the output of the controllable reset signal pin of the input/output serial port expansion chip 6, the signal output terminal of the power monitoring chip, and the PCIE expansion slot reset signal of the network security device are all at high level, the high level is output, that is, the reset is implemented. In general, the output of the controllable reset signal pin of the input/output serial port expansion chip 6 and the PCIE expansion slot reset signal of the network security device are both at high levels, and the device monitors the power supply of the expansion card 5 through the power supply monitoring chip to implement power-on reset. When the expansion card 5 is detected to be abnormal, the device can control the controllable reset signal pin of the input/output serial port expansion chip 6 to reset the expansion card 5. A reset indicator lamp is also provided on the device to indicate the reset of the expansion card 5.

In summary, the present invention discloses a low-cost PCIE hot-plug multi-mode compatible device, which uses an input/output serial port expansion chip to expand an interface on a system management bus of a network security device and access an expansion card, and does not need to redefine an expansion slot installed on the network, and has good compatibility.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.