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AM3358: DDR3 connections

Part Number: AM3358
Other Parts Discussed in Thread: TMDSSK3358

I have a question about mapping between DDR3 and AP.

I'm making a custom board using AM3358 and DDR3(MT41K256M16TW-107 AAT:P https://www.micron.com/products/dram/ddr3-sdram/part-catalog/mt41k256m16tw-107-aat )

I found something difference DDR3 mapping on Beaglebone Black and TMDSSK3358(MT41J128M16JT-125) starter kit.

What reference board do I follow in my case?

Is there any guide about the difference?

*Beaglebone DDR3 mapping (https://github.com/beagleboard/beaglebone-black/blob/master/BBB_SCH.pdf)

Memory - AP

1) DDR A lines

DDR_A15 - DDR_A15

2) DDR D lines

DDR_D0 - DQ0

DDR_D1 - DQ1

DDR_D2 - DQ2

...

DDR_D15 - DQ15

*TMDSSK3358 DDR3 mapping http://www.ti.com/lit/df/sprr356/sprr356.pdf

1) DDR_A lines

DDR_A15 # DGND or OPEN?

2) DDR D lines

DDR_D3 - DQ0

DDR_D6 - DQ1

DDR_D5 - DQ2

...

DDR_D13 - DQ14

DDR_D9 - DQ15

  • Hi,

    MT41K256M16TW-107 AAT:P has 15 row addresses, A[14:0], so you do not need to connect A15. You can leave A15 unconnected.

    As for the data lines, you can freely swap bits within a byte lane to facilitate routing, but each byte lane must be matched with its corresponding DQS and DM signals.