Hi all,
Andy Green wrote:
On 12/02/09 20:25, Somebody in the thread at some point said:
What did you do with your chip select line on the ULPI PHY?
I turn this line (CS_N) low before initializing ISP1504.
It's more a question about what that input on the PHY chip sees during
powerup / reset... it needs to be nicely and definitely high the whole
time so it will ignore what happens then. Is it pulled up, or just
connected to the iMX GPIO? iMX GPIO alone may not be enough. They
mostly default to 100K pullup but even that may not be enabled early in
the powerup action.
A 10K to your IO voltage rail on CS_N solved it for the LiteKIT and on
the boards we have made.
I just wanted to point out that we also have a 10K pull-up on the CS_N
on our boards, it helps a lot.
Val
--
Valentin Longchamp, PhD Student, EPFL-STI-LSRO1
valentin.longchamp@xxxxxxx, Phone: +41216937827
http://people.epfl.ch/valentin.longchamp
MEA3485, Station 9, CH-1015 Lausanne
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