LS1046 Codewarrior DDR: How to calculate this data 'CLK to DQS'

[Hmc510]

chip ls1046 with DDR 8G (16bit*1G *4chip) .ECC*1

I'm not sure if my calculation is correct:

1.CK_C =62.723mm. CK_T=62.722mm  (Length of copper wire between ls1046 and DDR on PCB)

2.LDQS_C=45.661.LDQS_T=45.782

3.UDQS_C=48.758.UDQS_T=48.750

4.Select one of the groups:CK_C-LDQS_C. CK_C-UDQS_C. 

5.get result: 17 14...

one chip of DDR:

new Codewarrior project:

[Arxy]

I have a clarification question: 

Assuming that a CK is routed from the source to DRAM0 and then terminates at DRAM1, would the skew calculation for DRAM0 be (CK length at DRAM1)- (DQS at DRAM0)? Or (CK length at DRAM0)- (DQS at DRAM0)?

Thanks!

[mrudangshelat-13]

Hi @Hmc510,

Yes, it is the length difference between the clock signal and strobe signal connected to each memory chip.

Regards,

Mrudang