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From: amess on 19 Nov 2009 10:32
I had the same problem. FTDI just recently released an app-note called:
"AN_130 FT2232H Used In An FT245 Style Synchronous FIFO Mode". In this app.
note they say to enable RTS_CTS flow control in the driver. This fixed the
problem for me. I would not of thought this would be applicable to the high
speed sync-fifo mode, but it fixed it for me. I am currently transferring 1
GB of data in about 1 minute without errors on a machine that is probably 3
to 4 years old.

Good luck!

This chip is pretty nifty assuming the wrinkles can be ironed out.

- amess


>Hello,
>
>I`ve got a problem with the FT2232H programming.
>
>=================================================
>
>I`vs send my 18Mbytes data from FPGA to PC via the FT2232H IC.
>
>I set the USB transfer-size to 64KByte by FT_SetUSBParameters().
>
>And I could find that the received 18MBytes was fully transfferd well.
>
>EXCEPT the several data delay like below : (each number is 8bit received
>data)
>
>
>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
>....
>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
>....
>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
>....
>0 1 2 3 4 5 6 7 8 9 10 7 8 9 10 11 12 13 14 15 16
>....
>17 18 19 20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
>....
>17 18 19 20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
>....
>17 18 19 20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
>....
>
>
>Above is just example. Actually, the delay has started at 31744th byte
>first.
>The starting point didn`t change, but the delay length is changable.
>
>
>I have no idea how I can make it exactly.
>
>==============================================================================
>
>
>Has anybody got an idea about this issue?
>There is few data for this new released device, FT2232H.
>
>Greeting, Paul
>
>
>



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