FX2LP Slave FIFO Mode becomes non responsive for big back to back writes

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FX2LP Slave FIFO Mode becomes non responsive for big back to back writes

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FX2LP Slave FIFO Mode becomes non responsive for big back to back writes

	Abhey posted on 12 Jul 2012 7:02 PM PST Member 2 Forum Posts

Hi,

I am using FX2LP in slave fifo mode for USB integration with the FPGA on a custom board. The USB controller works fine for small to medium transactions. If I try back to back bulk writes (each of 1M Bytes), the controller becomes non responsive. I can see the transactions being posted by the host, but the FPGA never gets any response from slave fifos. The problem suddenly disappears if I try a smaller write. Then for some time, the larger writes will work and again will run into a halt after a few write cycles.

Any suggestions what's going wrong the FX2LP ?

Thanks,

Abhey

Re: FX2LP Slave FIFO Mode becomes non responsive for big back to back writes

	aasi posted on 13 Jul 2012 02:35 AM PST Cypress Employee 1090 Forum Posts

Have you hooked up a CATC analyzer to see what is happening on the bus.

I've seen issues when big transfer (1MB is big when you push it to host controller is one shot) are triggered due to host controller buffer limitation. CATC trace should tell us if the data is even going to the FX2LP or not.

Regards,

Anand

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FX2LP Slave FIFO Mode becomes non responsive for big back to back writes

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