Hi!
With our current SDRAM initialization (in our boot code), sometimes th SDRAM does not work correctly after power-up reset. Every second quad-wor can't be accessed (it seems that it can't be written).
When the SDRAM is in this erroneous state after power-up, repetitiv resets (not power-up) won't resolve the problem. Only a power-off/on cycl will resolve the problem.
So I think, something is missing or wrong in the initialization sequence.
We are using a Technologic Systems TS-7200 board with an EP9302 CPU. The initialization code we took is from the Open TS-72XX system boo code.
The datasheet of the SDRAM does not cover the initialization sequence.
Any ideas?
Thank you in advance! Gerhard