DDR3L bit swapping with LS1012A processor within byte

nilavchoksi — Mon, 24 Jul 2017 10:48:56 GMT

Hello,

I am designing custom board using LS1012A processor and interface with two 1Gx8 DDR3L micron DDR3L chip.

During layout, I am facing issue of routing of data lines so that as per AN3940 (Hardware and Layout Design
Considerations for DDR3 SDRAM Memory Interfaces) I have swapped the datalines in D0 to D7 at first DDR3L end.

Also, attached swapped connections of first DDR3L with Processor.

So, will it work for me? because I can't see any information or guide to change this bits from firmware configuration level and confusion on the connections.

Looking for your help.

Re: DDR3L bit swapping with LS1012A processor within byte

ufedor — Mon, 24 Jul 2017 13:48:12 GMT

It is possible to swap bits within a byte lane.

Please refer to the AN3940, Table 1. DDR3 Designer Checklist, 45:

https://www.nxp.com/webapp/Download?colCode=AN3940

Note that the MMDC supports only x16 data bus width.

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DDR3L bit swapping with LS1012A processor within byte

Re: DDR3L bit swapping with LS1012A processor within byte