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Design of USB interface of embedded system based on FPGA

YANG Zhi-kun,ZENG Bo,TANG Guo-wen (School of Electronic Engineering,University of Electronic Science and Technology,Chengdu 611731,China)  
The paper focus on the implementation of the IP-PBX PSTN system based on FPGA,realizes the interface connection between conventional PSTN and PC.The USB2.0 interface chip EZ-USB FX2 CY7C68013A-56 works in slave FIFO mode,it provides high-speed transmission channels for data and commands of the embedded system based on FPGA, realizes the high-speed data transmission between the PC and FPGA system.The hardware testing result proves that the system works stable,and satisfies the audio criterion.
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