CN116303175A - Multifunctional remote PCIe transfer card based on optical fiber communication - Google Patents

Multifunctional remote PCIe transfer card based on optical fiber communication Download PDF

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Publication number
CN116303175A
CN116303175A CN202310099006.8A CN202310099006A CN116303175A CN 116303175 A CN116303175 A CN 116303175A CN 202310099006 A CN202310099006 A CN 202310099006A CN 116303175 A CN116303175 A CN 116303175A
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China
Prior art keywords
pcie
interface
card
serial
parallel conversion
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Pending
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CN202310099006.8A
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Chinese (zh)
Inventor
余宗洋
黄光明
陈凯
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Central China Normal University
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Central China Normal University
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Priority to CN202310099006.8A priority Critical patent/CN116303175A/en
Publication of CN116303175A publication Critical patent/CN116303175A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4004—Coupling between buses
    • G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0008—High speed serial bus, e.g. Fiber channel
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0026—PCI express
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/38—Universal adapter
    • G06F2213/3852—Converter between protocols
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Information Transfer Systems (AREA)

Abstract

The utility model discloses a multi-functional long-range PCIe adapter card based on optical fiber communication, include: an optical communication interface; a PCIe interface; 2 electrical connection interfaces, one of the 2 electrical connection interfaces being connected with the optical communication interface, the other of the 2 electrical connection interfaces being connected with the PCIe interface; and the connector can expand the number of optical communication channels of the main PCIe board card when the connector is used for connecting one of the 2 electric connection interfaces with the electric connection interface of the main PCIe card, can expand the PCIe interface channel of the main PCIe board card when the connector is used for connecting the other of the 2 electric connection interfaces with the electric connection interface of the main PCIe card, and can realize the function of an optical communication remote PCIe interface when the connector is used for interconnecting the 2 electric connection interfaces. The PCIe adapter card has the characteristics of flexibility, low cost, support of remote connection and the like, and simultaneously supports a plurality of interconnection modes.

Description

Multifunctional remote PCIe transfer card based on optical fiber communication
Technical Field
The invention relates to a multifunctional remote PCIe transfer card based on optical fiber communication.
Background
PCIe acquisition cards are widely used in a variety of data transmission and acquisition systems, and as the requirements of application scenarios increase, the design of the PCIe acquisition cards becomes more and more complex, and the board card structure and occupied space become larger and larger. The PCIe card of the conventional data acquisition system generally receives the collected data transmitted by the front-end electronic device through the data communication interface, and forwards the data to the server software end through the PCIe bus. With the complexity of functions and the increase of bandwidth requirements, PCIe switch cards are emerging that are limited by the size of the server chassis space. The transfer card and the main PCIe board card occupy a plurality of PCIe card slots together, so that higher interface bandwidth and more complex functions are realized. The riser card may also provide an additional PCIe interface for the circuit board outside the chassis for high speed data transmission. The existing adapter cards mainly comprise an OCuLink adapter card, an optical fiber-based PCIe adapter card and the like.
The OCuLink adapter card adopts OCuLink to connect the main PCIe board card to achieve the purpose of adapter or expansion, but it is not suitable for the equipment that the main board card does not have OCuLink connector or PCIe golden finger, and OCuLink connector is the electrical connection, compare in optic fibre, is not suitable for long-distance transmission. The existing PCIe transfer card based on the optical fiber mostly carries out transfer or data exchange through PCIe exchange chips or Field Programmable Gate Arrays (FPGA), and has the defects of high cost, complex circuit and the like.
Disclosure of Invention
The invention provides a remote PCIe transfer card based on optical fiber communication, which has the characteristics of flexibility, low cost, support for remote connection and the like, and simultaneously supports various interconnection modes.
The invention provides a remote PCIe transfer card based on optical fiber communication, which has three transfer functions. Function one: when the switching card is matched with the main PCIe card, the switching card can expand the number of optical communication channels of the main card. And the function II: when the adapter card is matched with the main PCIe card, the adapter card can expand the PCIe channel number from the main PCIe card to the CPU of the computer. And the third function: the PCIe interface is connected to the system outside the case through the optical fiber remotely by adopting a brand new structure, and remote PCIe communication can be realized.
According to a first aspect of an embodiment of the present invention, there is provided a multifunctional remote PCIe switch card based on optical fiber communication, including: an optical communication interface; a PCIe interface; 2 electrical connection interfaces, one of the 2 electrical connection interfaces being connected with the optical communication interface, the other of the 2 electrical connection interfaces being connected with the PCIe interface; and the connector can expand the number of optical communication channels of the main PCIe board card when the connector is used for connecting one of the 2 electric connection interfaces with the electric connection interface of the main PCIe card, can expand the PCIe interface channel of the main PCIe board card when the connector is used for connecting the other of the 2 electric connection interfaces with the electric connection interface of the main PCIe card, and can realize the function of an optical communication remote PCIe interface when the connector is used for interconnecting the 2 electric connection interfaces.
The PCIe interface comprises a high-speed data transmission line and a control line, signals of the control line are converted by a serial-to-parallel conversion chip, a clock of the PCIe interface drives the serial-to-parallel conversion chip, the control line of the PCIe interface is connected to a low-speed parallel port of the serial-to-parallel conversion chip, the serial-to-parallel conversion chip encodes data of multiple paths of parallel ports and then sends the encoded data to the front end through an SFP, serial signals from the front end are decoded by the serial-to-parallel conversion chip and then are converted by the serial-to-parallel conversion chip, and the decoded signals are sent to the PCIe interface.
According to a second aspect of the embodiments of the present invention, a front end board is provided that is capable of receiving data and control signals of the multifunctional remote PCIe switch-card based on fiber optic communications.
The PCIe data channel on the front end board is directly connected with the corresponding FPGA hard core of the FPGA, the control signal interacts with the FPGA after being encoded and decoded by the other serial-parallel conversion chip, and the other serial-parallel conversion chip extracts the PCIe clock and the control signal for the PCIe hard core and receives the WAKE state signal. Or the control and status electrical signals transmitted by the SFP of the front end board are directly input to the MGT high-speed transceiver in the FPGA, the MGT high-speed transceiver and the firmware in the FPGA realize serial-parallel conversion and decoding, the control signals and clocks extracted by the MGT high-speed transceiver are sent to a PCIe related module, and the status signals in the opposite direction are sent out by the SFP after the MGT high-speed transceiver realizes coding and parallel-serial conversion.
The prior art is generally limited to achieving the above-described second function or third function in a more complex manner. The invention can realize three functions through one single board and can switch the working modes according to the needs. For the implementation of the third function, a typical mode is to use a special PCIe switching chip or a Field Programmable Gate Array (FPGA) to perform PCIe protocol forwarding and parsing processing. The invention is unique in that PCIe data is directly subjected to photoelectric-electric conversion on one hand, and control and status signals of the PCIe interface are converted into optical signals by adopting a universal serial-parallel-serial conversion chip on the other hand for transmission. The method supports the long-distance transmission characteristic of the PCIe card, and simultaneously, the PCIe card is simple in design and low in cost. In the front-end system outside the case, the interface to be realized is a standard PCIe interface, and PCIe clock and control signals are analyzed from the serial signals.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the following description will briefly explain the drawings of the embodiments.
FIG. 1 is a functional block diagram of a multifunctional remote PCIe switch card based on fiber communication according to one embodiment of the present invention.
Fig. 2 is a schematic diagram of two connection modes of a multifunctional remote PCIe transit card and a master PCIe card based on optical fiber communication according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a remote PCIe connection mode of a multifunctional remote PCIe switch card based on optical fiber communication according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of main signal transmission between a multifunctional PCIe switch-card and a front-end remote system based on optical fiber communication according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of main signal transmission between a multifunctional PCIe switch-card and a front-end remote system based on optical fiber communication according to another embodiment of the present invention.
Detailed Description
FIG. 1 illustrates a functional block diagram of a multi-function remote PCIe switch card based on fiber optic communications. As shown in fig. 1, the PCIe switch card includes an optical communication interface, a PCIe interface, and 2 electrical connection interfaces 1, 2. The 2 electrical connection interfaces 1, 2 may be OCuLink. In addition, the PCIe adapter card also has a power module. Fig. 2 illustrates two ways of connecting a PCIe transit card and a master PCIe card. As shown in fig. 2, the optical communication interface of the PCIe switching card is connected with the electrical connection interface of the main PCIe card through the electrical connection interface 1, the PCIe interface of the PCIe switching card is connected with the electrical connection interface of the main PCIe card through the electrical connection interface 2, and the electrical connection interface of the main PCIe card is connected with the FPGA. If the electrical connection interfaces 1, 2 of the PCIe switch card are both 16-way (without limitation), then the PCIe switch card in cooperation with the other master PCIe board card can implement two modes: in the first mode, when the electric connection interface 1 is interconnected with another main PCIe board card, the number of optical communication channels of the main PCIe board card in 16 paths can be expanded; in the second mode, when the electrical connection interface 2 is interconnected with another main PCIe board card, PCIe interface channels of the main PCIe board card may be extended by 16 ways.
Referring to fig. 3, the optical communication interfaces of the pcie switch card may be QSFP and SFP. The QSFP has 4, but is not limited thereto. The SFP has 1 number, and is not limited thereto. The interconnection of the electrical connection interfaces 1 and 2 can start a third mode of the PCIe adapter card, namely: four QSFPs transmit 16-way bidirectional PCIe data, and can realize a 16-channel optical communication remote PCIe interface function. The invention can manually select the optical communication interface and the electric connection interface through the connector (connector) to realize the switching among the mode one, the mode two and the mode three. PCIe interfaces include high-speed data transmission lines and control lines (slow control lines). The signal of the control line is converted by a serial-parallel conversion chip. The serial-parallel conversion chip may employ a TLK2501 transceiver chip, but is not limited thereto. As shown in fig. 3, the TLK2501 is driven by a 100MHz clock from the PCIe interface, control lines related to the PCIe interface, such as PERST and PWRBRK, are connected to a low-speed parallel port of the TLK2501, and the TLK2501 encodes 8B10B data of the 16 parallel port and then sends the encoded data to the front end through the SFP at a speed of 2 Gbps. In the opposite direction, the 2Gbps serial signal from the front end is decoded by the TLK2501, and then serial-parallel converted, and the signal such as WAKE is parsed out and sent to the PCIe interface.
The host or the server has a PCIE socket on its motherboard, into which a PCIE adapter card may be inserted. For front-end systems (also known as front-end boards or front-ends) outside of the host or server chassis, a more common example is implementing PCIe protocols using FPGAs. The front end board generally comprises an FPGA and an optical module, and can receive and transmit data and process the data, and the data is sent to a back-end host or a server for storage after the data processing is completed. Aiming at the situation that the front end board only has an optical module and can not send high-speed data to the back end server through optical fibers, the invention provides the multifunctional remote PCIe adapter card based on optical fiber communication. There are two ways the front end board receives the PCIe switch card data and control signals.
In the first mode, as shown in fig. 4, PCIe data channels on the front end board are directly connected to FPGA hard cores corresponding to the FPGA, control signals are interacted with the FPGA after being encoded and decoded by a serial-parallel conversion chip (TLK 2501 may be used, but not limited thereto), and the serial-parallel conversion chip TLK2501 extracts PCIe clocks and control signals for the PCIe hard cores and receives status signals such as WAKE.
The second way is shown in fig. 5, where the control and status electrical signals transmitted by the front end board SFP are directly input to the MGT high speed transceiver inside the FPGA. The MGT high-speed transceiver and the firmware in the FPGA realize similar serial-to-parallel conversion and 8B10B decoding of the TLK2501, and the extracted control signals and clocks are sent to a PCIe related module. The state signal in the opposite direction is sent out by SFP after 8B10B coding and parallel-serial conversion are realized by MGT.
In summary, it can be seen that the remote PCIe switch card based on optical fiber communication according to the present invention can implement 3 different PCIe expansion card functions through different connection modes. The PCIe data line is directly connected with the optical module for optical transmission. The invention adopts a commercial low-price transceiver TLK2501 to combine multiple PCIe slow control lines into one serial signal and adopts optical transmission, and simultaneously embeds PCIe clock signals, and the innovation is not only aimed at TLK series transceivers. The last innovation point is to propose two schemes for extracting PCIe clock and control signals by the front end board.

Claims (5)

1. The utility model provides a multi-functional long-range PCIe adapter card based on optical fiber communication which characterized in that includes:
an optical communication interface;
a PCIe interface;
2 electrical connection interfaces, one of the 2 electrical connection interfaces being connected with the optical communication interface, the other of the 2 electrical connection interfaces being connected with the PCIe interface; and
the connector can expand the number of optical communication channels of the main PCIe board card when one of the 2 electric connection interfaces is communicated with the electric connection interface of the main PCIe card, can expand the PCIe interface channel of the main PCIe board card when the other of the 2 electric connection interfaces is communicated with the electric connection interface of the main PCIe card, and can realize the function of optical communication remote PCIe interfaces when the 2 electric connection interfaces are interconnected.
2. The multifunctional remote PCIe switching card based on optical fiber communication according to claim 1 wherein the PCIe interface comprises a high-speed data transmission line and a control line, signals of the control line are converted by a serial-to-parallel conversion chip, a clock from the PCIe interface drives the serial-to-parallel conversion chip, the control line of the PCIe interface accesses a low-speed parallel port of the serial-to-parallel conversion chip, the serial-to-parallel conversion chip encodes data of multiple paths of parallel ports and sends the encoded data to a front end through an SFP, serial signals from the front end are decoded by the serial-to-parallel conversion chip and then converted into signals to be sent to the PCIe interface.
3. A front end board capable of receiving the data and control signals of the fiber-optic communications based multi-function remote PCIe switch-card of claim 1 or 2.
4. A front end board according to claim 3, wherein PCIe data channels on the front end board are directly connected to corresponding FPGA hard cores of the FPGA, control signals are encoded and decoded by another serial-to-parallel conversion chip and then interact with the FPGA, and the other serial-to-parallel conversion chip extracts PCIe clock and control signals for the PCIe hard cores and receives WAKE status signals.
5. A front end board according to claim 3, wherein SFP-transmitted control and status signals of the front end board are directly input to an MGT high-speed transceiver inside the FPGA, serial-parallel conversion and decoding are implemented by the MGT high-speed transceiver and firmware inside the FPGA, control signals and clocks extracted by the MGT high-speed transceiver are sent to a PCIe-related module, and status signals in opposite directions are sent out through the SFP after being encoded and serial-parallel converted by the MGT high-speed transceiver.
CN202310099006.8A 2023-01-31 2023-01-31 Multifunctional remote PCIe transfer card based on optical fiber communication Pending CN116303175A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310099006.8A CN116303175A (en) 2023-01-31 2023-01-31 Multifunctional remote PCIe transfer card based on optical fiber communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310099006.8A CN116303175A (en) 2023-01-31 2023-01-31 Multifunctional remote PCIe transfer card based on optical fiber communication

Publications (1)

Publication Number Publication Date
CN116303175A true CN116303175A (en) 2023-06-23

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Application Number Title Priority Date Filing Date
CN202310099006.8A Pending CN116303175A (en) 2023-01-31 2023-01-31 Multifunctional remote PCIe transfer card based on optical fiber communication

Country Status (1)

Country Link
CN (1) CN116303175A (en)

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