[microblaze-uclinux] DDR Data size Question

[Greg Miller <apco25@xxxxxxxxx>]

Hello,

 

OK, I'm a little confused about OPB data sizes. I got a design working with a V2Pro and Microblaze with the opb_ddr controller. This 'seemed' to read and write 32-bit data sizes but the DDR was 16-bits. I thought it was doing this with BE control automatically.

 

Now, I am working on a different design and have created a similar structure. opb-ddr controller is the same with the same version and microblaze is set up the same. The new ddr controller works, but it only will read write the LS two bytes. Am I missing something in the setup? I mean the mb_vanilla's ddr is only 16 bits wide. When you pull up XSP in that board do you read and write '32-bits' (not really 32, but you know what I mean)

 

Thanks,

Greg Miller