[SI-LIST] Regarding AC Input test conditions and Slew rate definition in DDR2 Specification
- From: mallikarjun K <malli.1729@xxxxxxxxx>
- To: SI-List <si-list@xxxxxxxxxxxxx>
- Date: Mon, 9 Dec 2013 12:30:52 +0530
When i am reading DDR2 specifications,
i got 2 different definitions for input signal slew rate , one is from
JESD79-2F and another is from JESD8-15A.
JESD79-2F says:
Falling skew = (Vref- Vil(ac)max)/delta TF
and Rising skew =(Vih(ac)min-Vref) / delta TR
JESD8-15A(SSTL_18) says :
Falling skew = (Vih(dc)min- Vil(ac)max)/delta TF
and Rising skew = (Vih(ac)min-Vil(dc)max) / delta TR.
Why this difference in definition, which one to be considered.
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