Re: Recommendation for creating a DDR Sdram core for custom board and integrate in XPS

On 13 jun, 19:40, "MM" <m...@xxxxxxxxx> wrote:
"Pablo" <pbantu...@xxxxxxxxx> wrote in message

news:1181755261.328091.228890@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx



I have a custom board with a Micron memory. The company has said to me
that I should use a xilinx core but I have to modify this because they
said that their memories use internal loopback. I have tried to modify
these signals but this doesn't work.

If I understand your question correctly, take a look at the reference design
at the link below. It shows how to close the feedback loop internally. I
guess, depending on the hardware, you might need to introduce some delay in
this path...http://www.digilentinc.com/Data/Products/FX12/FX_12_BIST_Clean.zip

Finally I have decide to implement the core neccesary for this but I
don't know how could I integrate this with xps, since I need to use
XMD for PowerPC debug.

So, I need some recommendation about how to create a core for my DDR
Sdram and integrate in my PowerPC model (in XPS) so I could use XMD
for download the application in this memory.

XMD has nothing to do with the core. What exactly are you going to
implement? Integrating a peripheral into XPS isn't that difficult. Copy the
PLB_DDR core from the
%Xilinx_EDK\hw\XilinxProcessorIPLib\pcores\ directory into your projects
pcores directory and edit the source files however you want. Restart XPS or
rescan project repositories, XPS will pick up the local version of the core
instead of the one in the EDK tree.

/Mikhail

Thanks for your reply.

Respect to the project you send me, I cannot see the vhdl code related
to the ddr control. Where do I look for?.

Once again I am very grateful for your help

Regards

.

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