[SI-LIST] Re: A question about the tIS,tIH derating value of DDR2
- From: steve weir <weirsi@xxxxxxxxxx>
- To: sujingguo 00138059 <sujingguo@xxxxxxxxxx>
- Date: Thu, 15 Jul 2010 06:12:55 -0700
Faster slew rates reduce set-up time requirements, but extend hold time
requirements from the point the signal crosses the DC threshold.
Conversely, slower slew rates increase set-up and reduce hold time
requirements.
Steve
sujingguo 00138059 wrote:
> Hi all，
>
> We have a question about the tIS,tIH derating value of ddr2.
>
>
> According to the datasheet of Hynx:
>
> 1) For all input signals the total tIS(setup time) and tIH(hold time)
> required is calculated by adding the
> datasheet value to the derating value listed in above Table. (PS:"the
> derating value" is marked as delta(tIS) & delta(tIH) here,and the table is
> not listed for some reason.)
>
> Should the delta(tIS) and delta(tIH) above be added to the total tIS/tIH
> or the minimum value of tIS/tIH which is required by the receiver to ensure
> the right sampling?
>
> If the latter is the choice,does this mean that the the minimum value of
> tIS/tIH will change with the alterance of the skew rate of clk & AC / DQS &
> DQ？
>
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Steve Weir
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