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K66 SDRAM always addressing same location

Question asked by Jim Hall on Oct 26, 2017
Latest reply on Oct 30, 2017 by Hui_Ma

Hello,

 

I'm using a MK66FX1M0VMD18 with a 16bit  AS4C4M16SA-TIN SDRAM. The SDRAM has 8 column addresses, so the connections between it and the K66 are the same as in Table 35-7 of the K66 Family Reference Manual, with A21-22 on the K66 going to BA0-1 on the SDRAM.

 

The problem we are having is that if I write a value to a specific address, then I will get that same value back for every address that I then read.  So it is essentially as if the SDRAM controller ignores the address in the CPU instruction and always accesses the same SDRAM location. 

 

Has anyone seen this isssue before?

 

Thanks,

Jim

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