How to give phase shift to dqs signal.

HI Krupesh,

I have done similar experiment and it works!

What I did, instead of using DQS for data sampling (the dqs freq 50Mhz) , used 50Mhz internal clock.I have 50Mhz internal clock driving DDR.

On read instead of sampling data on the DQS we sample it on internal 50 Mhz clcok with a controlled phase shift.

The phase can be produces in multiples of 45 deg using 200Mhz clock using both the clock edges and putting a clock mux.

This mux can even be selected and controlled using a register to align the latching clcok and data so that you wouldnt miss it.

You can try this or even a 2x clock(in my case it could be 100Mhz) be used to create phase shift of the order of 90 degs.