DDR3 Memory controller has no DM pins

[buenos]

Hi

I'm designing a board with a CPU that has no DM (data mask) pins on it's DDR3 memory interface.
Where should I connect the DM pins on the DDR3 memory chips? GND, or VCC, or what?

 

[sivamani]

Hi,
With out mask signals how can we achieve mask functionality during read and write?I think it should be available.Can you share me the CPU part number or datasheet.

 

[buenos]

hi
I cannot share anything, it is under NDA.
Actually I have checked the jedec 240pin RDIMM design document and that one showd chip DM pins tied to GND, and the dim module has no DM pins.

 

[sivamani]

chk this micron RDIMM.u will get some idea how they are using mask..

https://download.micron.com/pdf/datasheets/modules/ddr3/JSZF36C512x72PD.pdf