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The data loss could be because the host application isn't fast enough to keep up with the data rate.
Please have a look at the streamer application source code available in the following path after FX3 SDK installation:
C# version :C:\Program Files (x86)\Cypress\EZ-USB FX3 SDK\1.2\application\c_sharp\streamer
CPP version: C:\Program Files (x86)\Cypress\EZ-USB FX3 SDK\1.2\application\cpp\streamer
You could also try and use the same streamer application to read data from FX3 and see if there is a data loss occuring.
Add the VID/PID in the source code of streamer to detect the FX3 running your firmware.
I've checked several times.When I set the data rate to 20MByte/s,there's still data loss.
I set the burst length to 16 (16KB per burst),and found that the data lost in a discipline of every 16KB.
I followed the example of AN75779 http://www.cypress.com/?rID=62824 .I created a DMA_TYPE_AUTO_MANY_TO_ONE channel .In this channel , the GPIF switch sockets（threads) via the data counter in GPIF state machine. The data counter was set to 8191(16KB,GPIF data bus is 16bit) as descriped in AN75779. It seemed that the data loss happened at buffer boundry.Can you give some advices about this phenomenon.