slave FIFO autoin

	petrol posted on 09 Sep 2011 2:36 AM PST Member 5 Forum Posts

Hi,friends

I am using CY7C68013-56PVC to transfer data from FPGA to USB Host. I use EP6 as autoin mode, autoinlength is 512 byte, dada wordwide is 8bits. When I tranfer an array consisted of 0x00 and 0xFF alternately as "0x00,0xFF,0x00,0xFF,0x00,0xFF...". The data received by host is not right. There are added 0x00 among such as "0x00,0xFF,0x00,00x00,xFF,0x00,0xFF...". The added 0x00 is stochastic. Meanwhile, the received data number is more than transferred. For example, 32 8bit-datas transferred,34 8bit-datas reveived. But when I tranfer an array not consisted of 0x00 and 0xFF alternately, I can received correct data and correct number. So puzzled!

So is anyone know where is the problem?Thank you very much!

Hi,friends

I am using CY7C68013-56PVC to transfer data from FPGA to USB Host. I use EP6 as autoin mode, autoinlength is 512 byte,

dada wordwide is 8bits. When I tranfer an array consisted of 0x00 and 0xFF alternately as

"0x00,0xFF,0x00,0xFF,0x00,0xFF...". The data received by host is not right. There are added 0x00 among such as

"0x00,0xFF,0x00,00x00,xFF,0x00,0xFF...". The added 0x00 is stochastic. Meanwhile, the received data number is more than

transferred. For example, 32 8bit-datas transferred,34 8bit-datas reveived. But when I tranfer an array not consisted of

0x00 and 0xFF alternately, I can received correct data and correct number. So puzzled!

The data example is show in attah.

So is anyone know where is the problem?Thank you very much!

0 255 0 255 0 255 0 255 0 255 0 255 0 255 0 255

0 255 0 0 255 0 255 0 255 0 255 0 255 0 255 0

255 0 255 0 255 0 255 0 255 0 255 0 255 0 255 0

255 0 255 0 255 0 0 255 0 255 0 255 0 255 0 255

0 255 0 255 0 255 0 255 0 255 0 255 0 255 0 255

53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97 53 97

Re: slave FIFO autoin

	aasi posted on 09 Sep 2011 06:22 AM PST Cypress Employee 1090 Forum Posts

Hi,

Did you check if you're meeting the timing?

When you say you're commiting 32 byte and 34 byte packets I assume you're using PKTEND pin to do that. The interleaved 0s and the bigger packet size suggest that your timing might not be right.

Regards,

Anand

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slave FIFO autoin

Re: slave FIFO autoin