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dhanisch
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Registered: ‎03-06-2009

plb_ddr_v2_00_a upgrade to mpmc_v4_03_a

I am trying to upgrade an older system using plb 3.4/opb interfaces to the plb_v4.6 interface and am having trouble with the memory controller upgrade.  I've read that the PLB_DDR memory controller provides a big endian connection to devices whereas the MPMC controller provides a little endian connection.  I know I need to swap pins to match the endianess, but does that mean I should swap all pins, just address pins, or just data pins?

 

Any suggestions?

 

--David 

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prateek_bhatt
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Registered: ‎08-21-2008

Hello. 

As far as swapping is concerned to tackle the big endian format you have to reverse every signal which is a vector.

Like address, data, DM, etc....as far as SDRAM is concerned. 

Best of luck.
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Unlimited in my Limits.
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