Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

DDR3 discret component skew question

Hi all, I'm designing a new board based on an ARRIA V with 2 DDR3 component. Both of them are x16 DQ. I routed CLK, address and command as T-topology. I want to use the Hard External Memory Int...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

I found another reference by chance in the Altera External Memory Interface Handbook, Vol 3, Assumptions p1-46:

This assumption requires that DQ-to-DQS skews be within the recommended 20 ps.

So it must be better than +/-1.5mm.