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Synchronous RS422 data receiving equipment based on USB interface

A technology of USB interface and receiving equipment, which is applied in the field of test equipment, can solve the problems of large size and complicated development, achieve the effect of small power consumption and weight, low cost, and meet the test requirements

Inactive Publication Date: 2020-06-23
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, general-purpose digital acquisition cards such as PCI / PCIe are mostly used, which are only suitable for industrial computers with card slots. They are large in size and difficult to develop.

Method used

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  • Synchronous RS422 data receiving equipment based on USB interface
  • Synchronous RS422 data receiving equipment based on USB interface
  • Synchronous RS422 data receiving equipment based on USB interface

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Experimental program
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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0011] The device realizes data acquisition through the universal USB2.0 data transmission interface. In terms of device selection, mature, stable and reliable mainstream chips are selected, while considering the requirements of small size and low power consumption.

[0012] A synchronous RS422 data receiving device based on USB interface, such as figure 1 As shown, it includes a level conversion module, a programmable logic device, a USB interface, and a power supply module.

[0013] The level conversion module, in this embodiment, adopts the low-voltage high-speed four-way differential line receiver AM26LV32 of TI Company to convert the RS422 level signal into an LVTTL signal, and the output signal is connected to FPGA. This chip is powered by 3.3V and supports a maximum line rate of 32Mbps.

[0014] Described programmable logic device (FPGA), this implem...

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Abstract

A synchronous RS422 data receiving device based on a USB interface comprises a level conversion module which converts an RS422 level signal into an LVTTL signal and outputs the LVTTL signal to an FPGAfor processing; a programmable logic device (FPGA) is used for receiving data, carrying out synchronous code detection through shifting, completing conversion from a bit stream to Byte data, storingthe Byte data into an FPGA internal FIFO, and transferring the data of the FPGA internal FIFO to an end point FIFO of a USB interface chip; the USB interface transmits data in the endpoint FIFO to a computer through a USB bus according to a USB reading request of the computer interface; and the power supply module is used for obtaining a 5V direct-current power supply from the USB interface. The invention aims to meet the test requirements of data output equipment with a synchronous RS422 interface.

Description

technical field [0001] The invention belongs to the field of testing equipment, and in particular relates to a synchronous RS422 data receiving equipment. Background technique [0002] The synchronous RS422 interface is a communication interface commonly used in military equipment. Through a pair of clock lines and a pair of data lines, Byte bytes are transmitted according to the bit stream according to the input source clock beat. It is comparable to asynchronous RS422 in terms of anti-interference ability Quite, the transmission efficiency is much higher than the asynchronous RS422 transmission mode. At present, the synchronous RS422 interface is more used as the communication interface between the data source and the wireless data link. During the process of converting data from Byte to Bit stream, the location information of Bit to Byte mapping is lost. In order to solve this problem, two bytes of 0xEB and 0x90 will be inserted regularly as the synchronization code whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42
CPCG06F13/4286G06F2213/0002G06F2213/0042
Inventor 李战行孙东芳白志强潘少朋于云翔
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST