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Using Flexbus with K10 with 100 pin package

Question asked by DON PORADA on Jan 10, 2014
Latest reply on Jan 27, 2014 by DON PORADA

Hello everyone.  The 100 pin package does not have all 32 pins of the buss on the Flexbus.  I have a project with 8megs of external ram connected to the flex bus.  The RAM chip has a 16 bit bus and I have a 16 bit latch on the lower 16 bits of the Flexbus.

 

As far as I can tell, the signals look OK for a write, but when I try to read, I get the latch signal, R/W signal, and CE signal, but not the OE signal.  It always stays high.  As far as I can tell, it was enabled by processor expert when I look at the PE code.

 

I also tried changing the OE pin to a generic IO pin and I am able to toggle the pin in software, so the pin is not shorted.

 

Anybody have any suggestions?

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