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USB Superspeed Peripherals

Anonymous
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 when i used the syn slave fifo example to transfer data from fpga to pc,my fpga give data at the speed of 20M/s(i use a FIFO in my fpga),i still want to let the FX3 works at the PCLK of 100MHz and 32bit mode ,so i think i have to use PKTEND to transfer short packets,then the problems come. i can't get the correct data, somebody can tell me about this problems? the handbook says that the PKTEND is used at the last word to be transfer, when i transfer a short packet , can i go on transfer a full packet or a short packet and go on and go on.....,

   

regards.

   

lint

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Anonymous
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What is the data that you are getting in the PC when you are committing a short packet using pktend signal?

   

Are you getting any extra data for a clock cycle or you are not getting any data?

   

Please let me know the behaviour that you are seeing at your end.

   

Regards,

   

sai krishna.

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Anonymous
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 hello,sai krishna! thanks for your reply.

   

when i try to transfer one short packet, i can get it in a packet correctly but i found a extra 00 00 00 00 packet, but i just set one buffer in the FX3 ! 

   

another problem is that i set only one buffer for each dma channel , then when the short packet is write into the FX3, the FLAG does not show full , what does FLAG show? short packet doesn't make the FLAG show the buffer is full?

   

regards,

   

lint

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Anonymous
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 you can tell me some of the problems you found and describe here for me , so i can compare them with my problem so i can try to solve it , thank you very much!

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