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I created the system that 4k byte data is transferred through EZ-USB bulk transfer. FPGA (target side) create 4k byte data created and host side received data.
But we sometimes found that EZ-USB FX2 packet data is lost 512*N byte data. And packet reading time is sometimes takes 100msec or more. (usual case average is 16-17msec)
EZ-USB FX2 has two 512 byte buffer that is used as FIFO. I guess to have it overwritten unexpectedly.
This same experience that someone for?
And how you resolved?
The following are the details.
□ Environmental FPGA: Actel APA-450-BG456 Driver: Windows almost as a sample using the Bulk Transfer PC OS: WinXP USB Target: 512byte * 2 FIFO memory used in
□ System Specifications • USB Bulk Transfer • Baud rate is about 2Mbps • FPGA allows every 16msec burn data to create a 4K SRAM save nearly • FPGA look at the USB Overflow flag Overflow if not designed to write data • Host-side applications, a simple data earnestly Read
□ worrisome phenomenon • The data of received at the host is 512*N bytes lost • Read by the host, but sometimes time-consuming than the 100msec