CN216118766U

CN216118766U - Protocol converter of USB bus and PC104 bus

Info

Publication number: CN216118766U
Application number: CN202122732829.9U
Authority: CN
Inventors: 罗贤全; 游玲; 单成进; 邱烨
Original assignee: Yango University
Current assignee: Yango University
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-03-22
Anticipated expiration: 2031-11-09

Abstract

The utility model discloses a protocol converter of a USB bus and a PC104 bus, which comprises an FPGA main control circuit, a USB interface, an MCU control circuit and a PC104 bus interface, wherein the FPGA main control circuit is respectively and electrically connected with the MCU control circuit and the PC104 bus interface, and the MCU control circuit is electrically connected with the USB interface. The utility model realizes the conversion from the PC104 bus protocol to the USB bus protocol, and the USB bus is used for realizing the communication with the computer through plug and play, thereby realizing the test and fault diagnosis of hardware without disassembling a hardware card, having great convenience, the converter is used as a function test card, the system not only has the advantage that the USB device can be used for plug and play hot plugging, but also has the high reliability and high expansibility of the PC104 bus device, and the single MCU control circuit is arranged for processing the receiving and sending tasks of the USB bus, thereby reducing the operation pressure and the IO interface pressure of the FPGA main control circuit.

Description

Protocol converter of USB bus and PC104 bus

Technical Field

The utility model relates to the technical field of protocol conversion, in particular to a protocol converter of a USB bus and a PC104 bus.

Background

The PC104 is an industrial computer bus standard, and due to the advantages of its unique stacked connection mode, high reliability, high scalability, low power consumption, and its high compatibility with PC software, the hardware boards of many application systems all adopt PC104 bus interfaces, which makes the PC104 bus widely used in military and industrial fields. However, due to the pinhole engagement of the PC104 and the large number of pins, the hardware using the PC104 is inconvenient because of the large disassembly workload during testing and maintenance.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: a protocol converter for USB bus and PC104 bus can realize simple test and communication of PC104 bus by computer.

In order to solve the technical problems, the utility model adopts a technical scheme that: a protocol converter of a USB bus and a PC104 bus comprises an FPGA main control circuit, a USB interface and a PC104 bus interface, wherein the FPGA main control circuit is electrically connected with the USB interface and the PC104 bus interface respectively.

Furthermore, the number of the USB interfaces is multiple, and the FPGA main control circuit is electrically connected with each USB interface respectively.

Furthermore, the USB interface control circuit also comprises an MCU control circuit, and the FPGA main control circuit is electrically connected with the USB interface through the MCU control circuit.

Further, the MCU control circuit includes a microprocessor U3 integrated with the USB engine.

Further, the power supply circuit comprises a voltage conversion circuit, and the voltage conversion circuit is electrically connected with the FPGA main control circuit so as to supply power to the FPGA main control circuit after power taking conversion.

Further, the voltage conversion circuit takes power from a USB bus interface and/or a PC104 bus interface.

Furthermore, the power supply circuit further comprises a selection circuit, the selection circuit is provided with two selection ends and a public end, the two selection ends are respectively and electrically connected with the USB bus interface and the PC104 bus interface, and the public end is electrically connected with the voltage conversion circuit.

Furthermore, the output end of the voltage conversion circuit is grounded after passing through the current-limiting resistor and the power indicator lamp.

Furthermore, the output end of the voltage conversion circuit is grounded after passing through the first filter capacitor, and the input end of the voltage conversion circuit is grounded after passing through the second filter capacitor.

The utility model has the beneficial effects that: the converter is used as a function test board card, so that the system not only has the advantage that USB equipment can be plugged and plugged in and out for hot plug, but also has high reliability and high expansibility of PC104 bus equipment, and an independent MCU control circuit is arranged for processing the receiving and transmitting tasks of the USB bus, so that the operation pressure and the IO interface pressure of an FPGA main control circuit are reduced.

Drawings

FIG. 1 is a block diagram of a protocol converter for a USB bus and a PC104 bus according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a selection circuit in the power circuit according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a voltage converting circuit in a power circuit according to an embodiment of the utility model.

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 fig. 3, an embodiment of the present invention provides a protocol converter for a USB bus and a PC104 bus, including an FPGA main control circuit, a USB interface, an MCU control circuit, and a PC104 bus interface, where the FPGA main control circuit is electrically connected to the MCU control circuit and the PC104 bus interface, respectively, and the MCU control circuit is electrically connected to the USB interface.

As can be seen from the above description, the beneficial effects of the present invention are: the converter is used as a function test board card, so that the system not only has the advantage that USB equipment can be plugged and plugged in and out for hot plug, but also has high reliability and high expansibility of PC104 bus equipment, and an independent MCU control circuit is arranged for processing the receiving and transmitting tasks of the USB bus, so that the operation pressure and the IO interface pressure of an FPGA main control circuit are reduced.

As can be seen from the above description, by providing a plurality of serial interfaces, serial data can be split and transmitted through a plurality of serial buses and then reassembled at the protocol converter, thereby improving the conversion efficiency of the protocol converter.

As can be seen from the above description, the MCU control circuit integrates the USB engine, and a separate USB chip is not required to be arranged for transceiving the USB bus.

Further, the MCU control circuit also comprises a memory chip with the model number of 24LC01, and the microprocessor is electrically connected with the memory chip.

As can be seen from the above description, the memory chip is specifically a 24LC01 chip, so as to realize that the firmware can be programmed online.

According to the description, the voltage conversion circuit supplies power to the FPGA main control circuit, so that an externally input power supply can be converted into a power supply suitable for the FPGA main control circuit, and the model selection range of the FPGA main control circuit is expanded.

According to the description, the voltage conversion circuit gets power from the interface, an independent power interface is omitted, the cost is reduced, the step of plugging and unplugging the power supply is omitted, and the complexity of operation is reduced.

From the above description, the PC104 bus is used for supplying power when the power supply requirement is large, the USB bus is used for supplying power when the power supply requirement is small, and the two modes are switched by the selection circuit to meet different power supply requirements.

As can be seen from the above description, the power indicator indicates whether the protocol converter has the working voltage, and can indicate whether the protocol converter is powered on.

From the above description, the filter capacitor ensures the stability of the input and output of the voltage conversion circuit.

The protocol converter of the USB bus and the PC104 bus is mainly applied to simply testing and communicating PC104 bus equipment by adopting a computer, and can also be applied to establishing communication with other equipment adopting the USB bus and the PC104 bus equipment.

Example one

Referring to fig. 1, the protocol converter of this embodiment includes a power circuit, a PC104 bus interface, an FPGA (Field-programmable gate array) main control circuit, an MCU control circuit and a plurality of USB bus interfaces, where the MCU control circuit is electrically connected to the FPGA main control circuit and each USB bus interface, so that the MCU control circuit can receive and transmit data from and to the USB bus interfaces and send the received data to the FPGA circuit according to a certain format for storage, the FPGA main control circuit is electrically connected to the PC104 bus interface, so that the FPGA main control circuit converts data sent by the USB bus interfaces into PC104 data packets and sends the PC104 data packets to the PC104 bus, and converts data interfaced with the PC104 bus interface into data of the USB bus interface and sends the data to the MCU control circuit.

The FPGA master control circuit includes a computer program stored in the FPGA master control circuit and operable on the FPGA master control circuit, and the controller implements the steps of the first embodiment when executing the computer program.

The MCU master control circuit comprises a microprocessor U3 and a memory chip U1, the microprocessor U3 is electrically connected with the FPGA master control circuit, the memory chip U1 and each USB circuit respectively, the microprocessor U3 adopts a CY7C68013 chip of an integrated USB engine, and the memory chip U1 specifically adopts a 24LC01 chip, so that online programming of firmware is realized.

2-3, the power supply circuit includes a selection switch J3, two selection terminals IN1 and IN2 of the selection switch J3 are respectively electrically connected with the power supply terminal +5V of the PC104 bus interface and the power supply terminal ADD of the USB bus interface, the common terminals OUT1 and OUT2 are input to the input terminal IN of the voltage conversion chip U2, and the output terminal OUT of the voltage conversion chip U2 is respectively electrically connected with the FPGA main control circuit and the USB control circuit to provide the converted 3.3V voltage for the two. According to the actual power supply requirement, when the power supply requirement is large, the PC104 bus is used for supplying power, when the power supply requirement is small, the USB bus is used for supplying power, and the two modes are switched through the switch J3 to meet different power supply requirements.

The output end OUT of the voltage conversion chip U2 is grounded after passing through the current-limiting resistor R8 and the power indicator lamp D8, when the protocol converter is powered on, the power indicator lamp D8 is lightened to indicate the working state of the protocol converter, the output end of the voltage conversion circuit is grounded after passing through the first filter capacitor C6, and the input end of the voltage conversion circuit is grounded after passing through the second filter capacitor C7, so that the stability of power input and output is ensured.

In summary, the protocol converter for the USB bus and the PC104 bus provided by the present invention realizes conversion from the PC104 bus protocol to the USB bus protocol, and communicates with a computer through the USB bus by plug and play, so that hardware testing and fault diagnosis can be realized without disassembling a hardware card, and great convenience is provided.

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 changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims

1. A protocol converter of USB bus and PC104 bus is characterized in that: the FPGA main control circuit is electrically connected with the MCU control circuit and the PC104 bus interface respectively, and the MCU control circuit is electrically connected with the USB interface.

2. The protocol converter of claim 1, wherein the protocol converter comprises: the USB interface is a plurality of, FPGA master control circuit electricity respectively connects each USB interface.

3. The protocol converter of claim 1, wherein the protocol converter comprises: the MCU control circuit comprises a microprocessor integrated with the USB engine.

4. A protocol converter for USB bus and PC104 bus according to claim 3, wherein: the MCU control circuit further comprises a memory chip with the model number of 24LC01, and the microprocessor is electrically connected with the memory chip.

5. The protocol converter of claim 1, wherein the protocol converter comprises: the FPGA control circuit further comprises a power circuit, the power circuit comprises a voltage conversion circuit, and the output end of the voltage conversion circuit is electrically connected with the FPGA main control circuit.

6. The protocol converter of claim 5, wherein the protocol converter comprises: the input end of the voltage conversion circuit is electrically connected with the power supply end of the USB bus interface and/or the power supply end of the PC104 bus interface.

7. The protocol converter of claim 6, wherein the protocol converter comprises: the power supply circuit further comprises a selection circuit, the selection circuit is provided with two selection ends and a public end, the two selection ends are respectively and electrically connected with the USB bus interface and the PC104 bus interface, and the public end is electrically connected with the voltage conversion circuit.

8. The protocol converter of claim 5, wherein the protocol converter comprises: the output end of the voltage conversion circuit is grounded after passing through the current-limiting resistor and the power indicator lamp.

9. The protocol converter of claim 5, wherein the protocol converter comprises: the output end of the voltage conversion circuit is grounded after passing through the first filter capacitor, and the input end of the voltage conversion circuit is grounded after passing through the second filter capacitor.