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AM5746: 32 bit DDR3 to 64bit SO-DIMM socket

Part Number: AM5746

Hello TI team!

I am creating board with AM5746 CPU, and this CPU has 32 bit DDR3 controller. I would like to route the DDR to the standard SO-DIMM socket.

The question is: Is it possible to route the 32 bit DDR controller(of AM5746) to the SO-DIMM 204 pin socket? This socket has 64 bit wide DDR interface. In theory it should be possible that just half of data signals and strobes are connected and the rest remains unused (data 32-64). Thus only half of the chips on board in socket would be used (I dont mind this). It is better to get big,cheap memory to DIMM socket and use only its 50% than have custom,hardwired chips on board. If it is possible how should I treat the Data 32-64 pins, strobes and mask pins of the SO-DIMM socket?

Thank you.

  • TI has not tested this configuration, thus cannot confirm if it will work.  Note the DDR PCB requirements defined in the Data Manual will still need to be met (trace impedance, length, skew, etc).  For the unused signals, likely want to terminate any unused inputs (unused data strobes, etc) - to keep them from floating.  The connector will have an impact on the signals - which TI has not evaluated or tested.