Hello List, i use a custom Board based on the AT91RM9200-EK. Now i want to Replace the Nor Flash AT49BV6416 by a larger one from Spanion. The older Atmel chip specifies 70ns Access Time, the most usual Spanion chips are slower in the 100ns Range.

Are you still using static memory controller?

As i read the CPU Datasheet correct at 60MHz EBI Speed the slowest Factor 1/4 gives 67ns Cycle Time.

Is the 67ns BFC clock cycle time? I think so.

Does anyone know, how Access Time for the parallel Flash is calculated and what Speed Grade is needed for a stable U-Boot out of it ?

please refer to datasheet about access time's description.

Could a slower (100ns) Chip be used, how can this be adjusted ? Are there any additional Parameters for the Flash Chip to care of (Burst Mode, Multi Bank) ?

I think the controller should support 100ns chip, if the timing is not enough, You can insert wait cycle for the access?

-Dave