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USB digital I/O module hardware design

Author: WangXiaoLi
Tutor: LongBing
School: University of Electronic Science and Technology
Course: Measuring Technology and Instruments
Keywords: USB data acquisition FPGA SRAM
CLC: TP336
Type: Master's thesis
Year: 2012
Downloads: 20
Quote: 0
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Abstract


The USB digital I/O module realized high-speed data transmission, data acquisition, storing control, trigger function. It is not only can send different excitation signals to the DUT, but also can quickly collect feedback data from DUT. The USB digital I/O module has64-channel independent input and output, and with memory function, whose memory depth is512kbits of per channel, and the fastest data rates up to50MHz. A variety of data transmission mode, which is single, period, discrete-level. In the aspect of trigger, this project realizes rising edge trigger, falling edge trigger, random trigger. The dissertation focuses on hardware circuit structures, digital logic circuit design of two aspects to elaborate the hardware design of USB digital I/O module. The main work accomplished in the following aspects:1. Hardware circuit design. The emphatically discusses the design of USB interface circuit, controller circuit, data memory circuit, two-way level of transform circuit. Analyzed problems of print circuit board. In the USB bus interface design, the design method of Special chip has been used to communicate with USB bus, which enhance the stability and reliability of data transmission, reduce the costs.2. Digital logic circuit design. For the USB digital I/O module, the key part lain in the external SRAM’s speed reading and writing operation. With Verilog HDL construct the rigorous digital logic in the FPGA internal, realize the multi-chip external SRAM’s various modes of read and writing. Focus on the design of the clock circuit module, data transmission module, data acquisition module, counter module design, realized the vary data quantity, vary frequencies, vary models of data transmission and acquisition.3. Soft and hardware online testing all functions and guideline. The testing results show that the USB digital I/O module work normal, PC can favorable control I/O module, achieve all function and meet each indication.This USB digital I/O module has preliminary finalize the design, and application in the related fields. The practice proved that this equipment transmission speed, excellent versatility, simple operation, light structure, convenient to carry, and will be a wide application in test field.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Electronic digital computer (not a continuous role in computer ) > Bus channel
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