We have a custom 9G45 board running 2.6.35 main line kernel booting from NAND with the file system on a USB 2.0 hard disc.

The hard disc is connected using the EHCI controller and we can obtain 25MB/s transfer rate using the following command to test the interface:

dd if=/dev/sdb of=/dev/null bs1024k count=8

If we then wrap this command in a loop or increase the count to say 1024 after a short while we get USB reset's and disconnects.

All USB pcb traces were impedance matched and we have tried using a bare PCB to route the signals from a PC to a USB drive through. This completes a 64GB transfer with no errors.

+1V0 core is fed from a linear regulator and a separate 1v0 regulator feeds the PLL's etc via the filters specified in the datasheet.

Has anyone else tried this test on their own board / ek? What sort of results did you get?

Hi Matt,

I've got exactly the same problem. Did you ever find a solution for this? I've tried everything.... including re-routing board and getting Atmel approval for schem/pcb - but still have this problem!

Evan

Hi Evan

We haven't got to the bottom of the issue yet. We now have 3 designs with the 9G45 / 9M10 fitted and each one of them exhibits the same issue.

We did find lowering the drive strength to the DDR2 helped but still did not completely fix the issue.

I'll drop you a pm with my contact details if the forum will let me and perhaps we could have a chat?

Many thanks

Matt

Any Luck yet? I have the same issues as well..
Has anyone contacted Atmel on this yet?

OAC.

Hi canat91

Atmel have updated the errata for the device which is on the current datasheet. I have been in contact with Evan and we have tried a couple of things but nothing is concrete.

Send me a pm with your email and we can compare notes too.

Matt