[SI-LIST] Re: VIH(AC) & VIH(DC) in DDR Analysis
- From: Johnson Sebastian <johnson007@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Thu, 23 Jun 2011 12:06:35 +0530
In simple words, device will change the logic state when it crosses AC level
and will stay in that logic till it exists its DC level. AC level will be
higher than DC level always(In the other way for a falling edge).
On Thu, Jun 23, 2011 at 11:30 AM, steve weir <weirsi@xxxxxxxxxx> wrote:
> DC thresholds represent two sets of values: A first set is the minimum
> offset from VREF that if given an indefinite amount of time the device
> will switch. The other is the maximum voltage outside the power rails
> that the device can continuously tolerate.
>
> The AC thresholds represent values that when satisfied the device will
> switch within the specified timing. Consequently the AC switching
> thresholds are further from VREF than the DC switching thresholds.
>
> Steve.
> On 6/22/2011 10:49 PM, karthi keyan wrote:
> > Hi experts,
> > What is the difference between VIH(AC)& VIH(DC) in DDR
> waveform?
> > Why we are considering both for "Logic level 1" ?
> >
> > Thanks,
> > Karthi
> >
> >
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-Johnson
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