2008-11-06 11:56:14     usb disk can not be written with large files

2008-11-06 11:56:14     usb disk can not be written with large files

yacobi chen (CHINA)

Message: 64778   

I driver a usb disk on my custom BF527 board. On the board BF527 connects to a root hub SL811. then sl811 connects to a 4 ports hub AU6254. The usb disk connect to the second port of AU6254.

Now the problem is that the usb disk can not be written with larger files, no matter it is connected to the on board power or external power.

But I find that the performace is better when I enlarge the value of B1WAT (BANK 1 write access time) (the SL811 is connect to BANK1 on my board).

So it looks like that there is not sufficient bank write access time to sl811. But i have already set it to 15, the maxium value. Anybody met this kind of problem before? Please tell me what should I do!

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2008-11-06 12:07:49     Re: usb disk can not be written with large files

Michael Hennerich (GERMANY)

Message: 64779   

On high Blackfin SCLK - The SL811HS requires dummy delay access in-between r/w accesses.

- To satisfy SL811 timing requirements. Check the SL811 Datasheet.

There is a config option for that

<M> SL811HS HCD support

(54) GPIO IRQ pin for Interrupt (NEW)

Dummy Delay ASYNC Memory Bank (No Dummy Delay) --->

-Michael