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Flexbus SRAM deep problems

Question asked by Andreas Schmidt on Nov 3, 2014
Latest reply on Nov 3, 2014 by TomE



we are using a MCF52259 board with Flexbus external 512KByte SRAM of type AS6C4008A 55ns. Our problem were bytes that occured on wrong places in the external SRAM when the MCU was on heavy duty. I wrote MarchC and MarchX RAM tests with 8, 16 and 32-bit access but I found no error. Finally we replaced the AS6C4008A 55ns with RAM of type IS62WV5128BLL 55ns and all our problems vanished. Until now we have no idea how to exact reproduce this errors, so that we could analyze them with a oscilloscope.


Has anybody experienced a similar behavior with Coldfire and SRAM on Flexbus? Any ideas how to reproduce this kind of error?


Best Regards,