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FRAM is ready for continuously delivering up to 40MHz SPI clock due to its technology... as explained in FRAM's data sheet (see Functional Overview in first post). There is no buffer involved... it is really like reading and writing RAM... There exist also FRAMs with 8bit parallel interface, that are then 8 times faster regarding throughput. I just do not know where the ferroelectric technology is heading for and what the caveats are.
allObjects
@Gordon
Great news it's working.
You'd have to check the datasheet. It's possible. You won't get a continuous stream of bits at that though!
I've just checked into this - it'll be fixed for 1v72. Looks like the same issue caused CS to be raised too early, which could have caused problems too.
They're connected to the SD card as well - could that be doing it?