阅读说明：本技术 一种跨电源信号管理总线 (Cross-power signal management bus ) 是由 石波 于 2021-09-30 设计创作，主要内容包括：本发明提供一种跨电源信号管理总线,包括：第一信号支路和第二信号支路,所述第一信号支路包括第一光耦合器,所述第二信号支路包括第二光耦合器；第一信号支路和第二信号支路的输入端均连接第一器件的信号端口和电平端口,第一信号支路和第二信号支路的输出端均连接第二器件的信号端口和电平端口。本发明可有效解决当前使用mosfet器件进行电平转换得速率慢得问题。(The invention provides a cross-power signal management bus, comprising: the optical coupler comprises a first signal branch and a second signal branch, wherein the first signal branch comprises a first optical coupler, and the second signal branch comprises a second optical coupler; the input ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the first device, and the output ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the second device. The invention can effectively solve the problem that the current mosfet device is used for carrying out level conversion with low rate.)

1. A cross-power signal management bus, comprising: the optical coupler comprises a first signal branch and a second signal branch, wherein the first signal branch comprises a first optical coupler, and the second signal branch comprises a second optical coupler; the input ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the first device, and the output ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the second device.

2. The cross-power signal management bus of claim 1, wherein the first signal branch comprises a first optical coupler and a first triode positive feedback drive circuit connected in series in sequence, and the second signal branch comprises a second optical coupler and a second triode positive feedback drive circuit connected in series in sequence.

3. The cross-power signal management bus of claim 2, wherein a first pin of the first optocoupler is connected to a level port of the first device, and a second pin of the first optocoupler is connected to the first signal input; a third pin of the first optical coupler is connected with a base electrode of the first triode, and the third pin of the first optical coupler is grounded through a resistor; a fourth pin of the first optical coupler is connected with a first signal output end through a first resistor, and is also connected with a level port of a second device; the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the first signal output end.

4. The cross-power signal management bus of claim 2, wherein a first pin of the second optocoupler is connected to the level port of the first device, and a second pin of the second optocoupler is connected to the second signal input; a third pin of the second optical coupler is connected with a base electrode of the second triode, and the third pin of the second optical coupler is grounded through a resistor; a fourth pin of the second optical coupler is connected with a second signal output end through a second resistor, and is also connected with a level port of a second device; the emitting electrode of the second triode is grounded, and the collector electrode of the second triode is connected with the second signal output end.

5. The cross-power signal management bus of claim 3, wherein the first transistor is an NPN transistor.

6. The cross-power signal management bus of claim 4, wherein the second transistor is an NPN transistor.

7. The cross-power signal management bus of claim 1, wherein the first device is an upper level topology node of a second device.

8. The cross-power signal management bus of claim 7, wherein the level port of the first device is different from the level port of the second device in level value.

Technical Field

The invention belongs to the technical field of servers, and particularly relates to a cross-power signal management bus.

Background

Along with the expansion and upgrading of a server system architecture, the types of system board cards and devices are increased day by day, so that the types of system power supplies are increased, the interconnection among the board card devices is more and more complex, the system management requirement is more and more severe, the topology of each management bus is more difficult, the requirement of routing wiring rules is upgraded, the requirement of signal quality is more strict, and more attention is paid to the signal transmission and the isolation among multiple boards and multiple systems. In the prior art, various management buses do not perform strict signal link processing on cross-board cascade transmission, various problems can occur in multi-level cross-board communication or communication links of different sources of the same level, and particularly, communication failure can occur under the condition that high-speed transmission is needed, and the electrical characteristics are such as board leakage, undervoltage, large signal fluctuation amplitude, level loss and the like, so that the management and monitoring of a server system are seriously influenced.

The current server system has the complex conditions of multi-power supply, independent power-on of multiple board cards, multi-level driving and the like, so that the management bus signal topology is in cross connection with a power domain, and level conversion and isolation are needed. The existing signal management bus adopts MOS tubes to carry out level conversion of different board card devices, logic level conversion of signals among different power supplies is processed, and the situations of electric leakage, undervoltage and the like can be solved.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the present invention provides a cross power signal management bus to solve the above-mentioned technical problems.

The invention provides a cross-power signal management bus, comprising: the optical coupler comprises a first signal branch and a second signal branch, wherein the first signal branch comprises a first optical coupler, and the second signal branch comprises a second optical coupler; the input ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the first device, and the output ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the second device.

Furthermore, the first signal branch comprises a first optical coupler and a first triode positive feedback driving circuit which are sequentially connected in series, and the second signal branch comprises a second optical coupler and a second triode positive feedback driving circuit which are sequentially connected in series.

Furthermore, a first pin of the first optical coupler is connected with a level port of the first device, and a second pin of the first optical coupler is connected with the first signal input end; a third pin of the first optical coupler is connected with a base electrode of the first triode, and the third pin of the first optical coupler is grounded through a resistor; a fourth pin of the first optical coupler is connected with a first signal output end through a first resistor, and is also connected with a level port of a second device; the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the first signal output end.

Furthermore, a first pin of the second optical coupler is connected with a level port of the first device, and a second pin of the second optical coupler is connected with a second signal input end; a third pin of the second optical coupler is connected with a base electrode of the second triode, and the third pin of the second optical coupler is grounded through a resistor; a fourth pin of the second optical coupler is connected with a second signal output end through a second resistor, and is also connected with a level port of a second device; the emitting electrode of the second triode is grounded, and the collector electrode of the second triode is connected with the second signal output end.

Further, the first triode is an NPN type triode.

Further, the second triode is an NPN type triode.

Further, the first device is a superior topology node of the second device.

Further, the level port of the first device is different from the level port of the second device in level value.

The beneficial effect of the invention is that,

the invention provides a cross-power signal management bus, which is characterized in that two signal branches with optical couplers are arranged, namely a first signal branch and a second signal branch, wherein the first signal branch comprises a first optical coupler, and the second signal branch comprises a second optical coupler; the input end of first signal branch road and second signal branch road all connects the signal port and the level port of first device, the signal port and the level port of second device are all connected to the output of first signal branch road and second signal branch road, firstly, get communication signal (SIG1, SIG2) and get into the output level domain through the conversion of opto-coupler S1/S2 under the input level, at this moment slew rate is decided by opto-coupler switching speed, can satisfy high low level switching speed demand, utilize triode positive feedback circuit drive high-speed opto-coupler device simultaneously, further improve level switching rate, can effectively solve and use the mosfet device to carry out the slow problem of rate of level transition at present.

In addition, the invention has reliable design principle, simple structure and very wide application prospect.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a cross power signal management bus according to an embodiment of the present application.

FIG. 2 is a pin diagram of an optocoupler across a power signal management bus according to one embodiment of the application.

FIG. 3 is a schematic diagram of a server device topology according to an embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The BMC executes a server remote Management controller, which is called Basebard Management controller in English. The method can perform operations such as firmware upgrading, machine equipment checking and the like on the machine in a state that the machine is not started. Fully implementing IPMI functionality in a BMC requires a powerful 16-bit or 32-bit microcontroller as well as RAM for data storage, flash memory and firmware for non-volatile data storage, providing basic remote manageability in terms of secure remote restart, secure re-power-up, LAN alerts and system health monitoring. In addition to the basic IPMI function and system operation monitoring function, the mBMC enables selection and protection of BIOS flash devices by storing the previous BIOS using one of 2 flash memories. For example, when the system cannot be started after the remote BIOS is upgraded, the remote administrator can switch back to the BIOS image that worked before to start the system. Once BIOS is upgraded, BIOS image can be locked to prevent virus from invading it.

A Central Processing Unit (CPU) is a final execution unit for information processing and program operation, and serves as an operation and control core of a computer system.

The new-generation bus interface specification eSPI (enhanced Serial peripheral) eSPI bus uses and multiplexes the electrical clock specification of the SPI bus, but uses a completely new definition in the protocol layer, so that the two are completely two-code in terms of functions and applications, and please not confuse the name simply because the names are similar. In addition to being fully compatible with the role and function of the LPC Bus, the eSPI Bus also translates both the SMBUS of oob (out of Band) and the GPIO of SideBand to an In Band Message that can be passed over the eSPI Bus, and In addition, can share flash with chipset In real time.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

Referring to fig. 1 and fig. 2, the present embodiment provides a cross power signal management bus, including: the signal conversion circuit comprises a first signal branch and a second signal branch, wherein the first signal branch comprises a first optical coupler S1 and a first triode Q1 positive feedback driving circuit which are sequentially connected in series, and the second signal branch comprises a second optical coupler S2 and a second triode Q2 positive feedback driving circuit which are sequentially connected in series. A first pin of the first optical coupler S1 is connected with a level port of the first device, and a second pin of the first optical coupler S1 is connected with a first signal input end; a third pin of the first optical coupler S1 is connected with the base of the first triode Q1, and a third pin of the first optical coupler S1 is grounded through a resistor; a fourth pin of the first optical coupler S1 is connected with a first signal output end through a first resistor, and a fourth pin of the first optical coupler S1 is also connected with a level port of a second device; the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to the first signal output terminal. A first pin of the second optical coupler S2 is connected with a level port of the first device, and a second pin of the second optical coupler S2 is connected with a second signal input end; a third pin of the second optical coupler S2 is connected with the base of the second triode Q2, and a third pin of the second optical coupler S2 is grounded through a resistor; a fourth pin of the second optical coupler S2 is connected with a second signal output end through a second resistor, and a fourth pin of the second optical coupler S2 is also connected with a level port of a second device; the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is connected to the second signal output terminal.

The first triode Q1 and the second triode Q2 are both NPN-type triodes.

Opto-coupler elements (Opto-isolators, or optical couplers, abbreviated as OCs), also known as optocouplers or optoisolators and Opto-isolators, abbreviated as optocouplers. The photoelectric coupling element is a set of devices for transmitting electric signals by using light as a medium, and has the function of maintaining good isolation between input and output of the electric signals at ordinary times and enabling the electric signals to pass through the isolation layer in a transmission mode when necessary. The photoelectric coupling element can transmit signals between two circuits which are not in common with the ground, and the two circuits cannot be influenced even if high voltage exists between the two circuits. The withstand voltage of the input to the output of a commercial photoelectric coupling element can reach 10kV, and the voltage change rate can be as fast as 10 kV/mu s.

An optical coupler generally consists of three parts: light emission, light reception and signal amplification. The input electric signal drives the light emitting source to emit light, which is received by the light detector to generate optical current, which is further amplified and output. This completes the electro-optic-electric conversion, thereby playing the role of input, output and isolation. The input and the output of the optical coupler are isolated from each other, so that the optical coupler has good electrical insulation capability and interference resistance. And because the input end of the optical coupler belongs to a low-resistance element working in a current mode, the optical coupler has strong common-mode rejection capability. Therefore, it can be used as a terminal isolation device in long line transmission information to greatly improve the signal-to-noise ratio. The interface device used for signal isolation in computer digital communication and real-time control can greatly increase the reliability of its operation. The light emitting source of the optical coupler is typically an infrared light emitting diode, which converts electrical energy into light of a specific wavelength, there is a closed optical channel (also called a dielectric channel) between the emitting source and the receiver, which is an optical sensor, which senses the light of the specific wavelength, and may be directly converted into electrical energy, or may modulate the current provided by the external power source by this signal. The receiver may be a photo resistor, a photodiode, a phototransistor, a Silicon Controlled Rectifier (SCR), or a TRIAC. Besides emitting light, the light emitting diode can also be used as a light sensing element, so that the light emitting diode can be used as the light sensing element, namely, the symmetrical bidirectional optical coupler. An optically coupled solid state relay in which a power switch is driven by an optocoupler having a photodiode, typically a pair of complementary MOSFETs. The slotted optical switch comprises a light emitting source and a receiver, but the light channel of the slotted optical switch is provided with an opening, and if other objects block the opening to prevent light from passing through, the signal generated by the receiver can be changed accordingly. One of the main functions of the optocoupler is to block high voltages and voltage transients, without voltage transients in these circuits affecting other parts of the circuit. In the past, this kind of function was realized by an isolation transformer, and the input and output terminals isolated by current by inductive coupling could transmit signals. The transformer and optocoupler are only two functions that provide enhanced protection while protecting the equipment and the personnel using the equipment. These devices physically have only a single isolation layer, but offer protection equivalent to IEC appliance class ii appliances with double isolation. The safety, testing and acceptance of optoelectronic coupling elements are subject to the specifications of various countries and international standards: IEC60747-5-2, European Commission on electrotechnical standardization 60747-5-2, UL1577, and CSA component Acceptance Notice # 5. The specification of the photoelectric coupling element issued by the manufacturer at least needs to meet one of the regulation standards.

As shown in fig. 3, for the multi-system cascaded eSPI, the main host end of the bus is on the CPU, the BMC and the CPLD link the next-stage bus topology, and each unit with control logic capability switches the role (host/slave) at any time according to different function applications, and finally monitors the information of the sensor and the riser. The CPU eSPI level source is 3V3_ AUX, the eSPI level source obtained by BMC/CPLD is 3V3_ AUX and P3V3 exist at the same time, and the level obtained by RISER and eSPI _ MUX are provided by independent level conversion chips, namely 3V3_ RISER and 3V3_ MUX respectively. Under the condition that the eSPIs are interconnected between different boards or different devices, the upper and lower topological nodes are interconnected by adopting the cross-power signal management bus provided by the embodiment, for example, between a sensor and a CPLD, the sensor is connected with the input end of the cross-power signal management bus, and the corresponding upper CPLD is connected with the output end of the cross-power signal management bus, so that the requirement of the eSPIMbit/s-level communication rate can be completely met.

In the cross-power-supply signal management bus provided by this embodiment, two signal branches with optical couplers are provided, that is, a first signal branch and a second signal branch, where the first signal branch includes a first optical coupler, and the second signal branch includes a second optical coupler; the input end of first signal branch road and second signal branch road all connects the signal port and the level port of first device, the signal port and the level port of second device are all connected to the output of first signal branch road and second signal branch road, firstly, get communication signal (SIG1, SIG2) and get into the output level domain through the conversion of opto-coupler S1/S2 under the input level, at this moment slew rate is decided by opto-coupler switching speed, can satisfy high low level switching speed demand, utilize triode positive feedback circuit drive high-speed opto-coupler device simultaneously, further improve level switching rate, can effectively solve and use the mosfet device to carry out the slow problem of rate of level transition at present.

Example 2

The present embodiment provides a cross power signal management bus, including: the optical coupler comprises a first signal branch and a second signal branch, wherein the first signal branch comprises a first optical coupler, and the second signal branch comprises a second optical coupler; the input ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the first device, and the output ends of the first signal branch and the second signal branch are connected with the signal port and the level port of the second device.

Compared with the prior art that the MOS tube is adopted, under the condition of the level conversion processing of the existing MOSFET, the logic level conversion of signals among different power supplies can be processed, the conditions of electric leakage, undervoltage and the like can be solved, but a very serious problem is that the requirement of high-speed transmission cannot be met, and the high-low level conversion speed cannot keep up with the high-speed condition. In the embodiment, an optical coupler is adopted for level conversion, communication signals (SIG1 and SIG2) with the level VCC1 enter a VCC2 level domain through the conversion of an optical coupler S1/S2, and the conversion rate is determined by the switching speed of the optical coupler and can basically reach 1 Mbit/S.

Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.