[SI-LIST] Re: How to distiguish tQHS and tDQSQ
- From: "Istvan Nagy" <buenos@xxxxxxxxxxx>
- To: "Lijun" <june_lee@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sun, 13 Jun 2010 11:22:22 +0100
Hi
both parameters apply to read transactions, both describe the total max
output skew (t_skew) of the data/DQS. t_DQSQ is used in setup budget, while
t_QHS is used in hold analysis.
one way of doing the setup and the hold analysis for DDRx memories:
t_x_margin = t_HP - t_skew - t_other_effects
regards,
Istvan Nagy
CCT
----- Original Message -----
From: "Lijun" <june_lee@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Cc: <vital_hncs@xxxxxxxxxx>; <sujingguo@xxxxxxxxxx>
Sent: Sunday, June 13, 2010 10:06 AM
Subject: [SI-LIST] How to distiguish tQHS and tDQSQ
> 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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