[SI-LIST] Re: A question about the tIS,tIH derating value of DDR2

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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