[SI-LIST] Re: Ring back
- From: "sreekanth namboothiri" <nsreekanth@xxxxxxxxxxxx>
- To: jain.nitin@xxxxxxxxx
- Date: Tue, 23 May 2006 01:13:26 -0500
Nice comments Nithin.
I also think its like that .
Sreekanth N Nampoothiri.
EDA Interoperability,
PTC Software-Pune
----- Original Message -----
From: jain.nitin@xxxxxxxxx
To: leeritchey@xxxxxxxxxxxxx, madhusudhan@xxxxxxxxxx,
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ring back
Date: Tue, 23 May 2006 11:03:51 +0530
I think there is lot of difference between undershoot & ringback.
Undershoot is a condition in which signal crosses the absolute
minimum
value expected(specified in datasheet). Whereas Ringing is condition
in
which signal while going from high to low or low to high rings
(something like a sinusoidal wave) and then settles down to a
definite
level.=0D
Ringing is not a problem as long as it is happening above Vih (min) &
below Vil (min). But if during ringing, signal tries to go into the
undefined state (region b/w Vih (min) & Vil (min)) during high period
or
low period, then that it is definetly a problem as it can simply
confuse
the receiver & operation might not be gurranted.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lee Ritchey
Sent: Monday, May 22, 2006 8:32 PM
To: Madhusudhan Kulkarni; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ring back
Ringback is just another name for undershoot. I don't know why
someone
had to invent another name for something that already had a name.
When you have undershoot and you use series terminations, the
terminator
value it too high or the output impedance of the driver is too high.
When you have undershoot and you use parallel terminations, the value
of
the terminator is too low. Fix which ever problem you have by
changing
the value appropriately.
> [Original Message]
> From: Madhusudhan Kulkarni
> To:
> Date: 5/22/2006 9:28:26 AM
> Subject: [SI-LIST] Ring back
>
> Hi,
> How to solve ringback problem and what is the disadvantages of=0D
> ringback
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