Remi Lefevre wrote:
That is the critical issue: the PSDMR values. If all else fails, read the part number off a chip that is on your board and download the datasheet for *that* *exact* part number. Sometimes manufacturers upgrade their parts or hardware makes a "compatible" substitution and the timing is differ
I'm now angry to myself. I was lost in refresh timers and memory controller settings and did not check again the "so basic" SDRAM device mode register.
Burst length was actually incorrect.... no comments! I'm ashamed.
Thank you very much to have persuaded me it was a SDRAM issue, hope was decreasing. And so sorry for wasted time...
Best regards, Rémi
Hi Rémi,
It is great that you have a solution and thanks for posting the resolution - all too many forget to do the last step of posting the resolution information.
Our "wasted time" will become the next engineer's 60 second problem identification and fix, due to the power of gmane/google *and* the fact that you posted the resolution.
For me, your SDRAM problem was not a waste of time, it was an intriguing puzzle to solve. In the words of Sir Isaac Newton, a smoother pebble or a prettier shell.
"I know not what I appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell, whilest the great ocean of truth lay all undiscovered before me."
http://www-groups.dcs.st-and.ac.uk/~history/Quotations/Newton.html
gvb (stepping down from the soapbox)