[SI-LIST] How to distiguish tQHS and tDQSQ
- From: Lijun <june_lee@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 13 Jun 2010 17:06:33 +0800
Hi experts;
We have a problem for timing analyze, There are two timing parameters in
Hynix DDR2 memory datasheet. the detailed description is as followed. what are
the differences?
Appricated any replies.
tQHS accounts for:
1) The pulse duration distortion of on-chip clock circuits; and
2) The worst case push-out of DQS on one transition followed by the worst case
pull-in of DQ on the
next transition, both of which are, separately, due to data pin skew and output
pattern effects, and
p-channel to n-channel variation of the output drivers.
tDQSQ: Consists of data pin skew and output pattern effects, and p-channel to
n-channel variation of the
output drivers as well as output slew rate mismatch between DQS/ DQS and
associated DQ in any given cycle.
Lijun
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