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usbn9604 speed increase needed

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xirix

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usbn9604 speed

I have a interface between a pic16F877 and a usbn9604 configured for isochronous transfer. I only achieved 64kbytes/s.
This means 1 transfer/ 1ms (1 FIFO= 64bytes). Ping-pong method doesn't give me any results.
Does anybody know how to increase transfer rate? It should be possible to send more than 1 pachet per frame (1ms).
 

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