[SI-LIST] Re: Setup-Hold time
- From: Jai Shanker <jswarrier@xxxxxxxxx>
- To: joshmachine_india@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Jun 2006 20:52:48 -0700 (PDT)
Hi Vighnesh,
Switch delay and settle delay are two ways of
quantifying transition times. This next is from an
earlier discussion on SI-LIST, I have added MIN & MAX
as I thought appropriate.
"Switch delay for rise edge is measured at first Vil
(MAX) crossing and for falling edge it is measured
first crossing at Vih (MIN). Settle delay for rise
edge is measured at the final Vih (MIN) crossing and
for falling edge it is measured at the final Vil (MAX)
crossing."
You can easily figure out how transition delays will
factor into an overall timing budget and the impact on
setup-hold times.
Refer to
http://www.qsl.net/wb6tpu/si-list/0214.html
and
//www.freelists.org/archives/si-list/02-2004/msg00119.html
for more discussion on this.
Regards,
Jai Shanker
--- Dharmendra Gowra <dharmendra.gowra@xxxxxxxxxxxx>
wrote:
> Hi Joshmachine,
>
> The switch delay is introduced because of the
> transmission line delay.=20
> If the clock and data lines are well matched, this
> parameter can be=20
> Ignored or will not have any effect on the Setup
> and hold time
> violation.
> =20
> The Settle delay is the skew which should be
> included in the setup and
> hold=20
> time calculation. (Because of under and over shoot
> the signal will not
> be =20
> Settled to defined logic)
>
> The settle delay is the time taken by the signal to
> settle into the
> high =20
> State logic or low state logic of the receiver.
>
> Please Correct if I am wrong.
>
> Thanks
> Dharmendra.G =20
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of vighneshrudra das
> Sent: Tuesday, June 13, 2006 3:13 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Setup-Hold time
>
> Hi gurus...
> Can you please clarify the
> exact relationship
> between...
> Setup/Hold time and
> Settle delay/Switch
> delay....
> Thankz in advance.
>
> Vighnesh
> =20
> =20
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