[SI-LIST] Re: PCI relected wave waveform at Transmitter in SigXplorer
- From: "Bhagwath, Nitin" <nitin.bhagwath@xxxxxx>
- To: <for_si2003@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 9 Sep 2004 14:06:54 -0700
VS,
Are you detecting the voltage in Sigexplorer before or after series
terminating resistor? Before (right at the output of the buffer) works
out to 2.xV, while after works out to about 1.65V.
If the above is not the root-cause, then could you please forward a more
detailed setup of the simulations (transmission line type, length,
value, termination value, load, buffer model). Is it fair to assume
that the same ibis models are used in both simulators (with a B element
in spice), and that the transmission lines are identical? =20
Regards
-Nitin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of V S
Sent: Thursday, September 09, 2004 11:59 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] PCI relected wave waveform at Transmitter in
SigXplorer
I am trying to use SigXplorer for a PCI reflected wave switching. I am
comparing the waveform of the SigXplorer and the hspice at the
TRANSMITTER. Although the waveforms at the receiver look similar, the
waveform at the transmitter in the SigXplorer looks different and
unexplainable. I expect the initial voltage at the tranmitter to be=20
Vo =3D Vcc*Zo/(Zo+R)=20
where R is the sum of the drive strength and the
series termination resistance and=20
is equal to Zo. Thus, I expect it to be 1.65V ( 1/2 of
3.3 V) and I am getting 1.65V in hspice. But in
SigXplorer, I am am getting it about 2.58V. Can anyone
try any PCI clock or data and confirm is it so and why
?
For example try Texas Instrument ibis model for 33 MHz
Clock Driver CDC960 model CDC960_T5 ( it can be
downloaded from TI website).=20
____
/ \=20
__/ \__ ____ 2.58V =20
/ \
/ \=20
/ \
/ \=20
SigXplorer waveform at Transmitter
____
/ \=20
/ \ =20
__/ \__ ____ 1.65 V =20
/ \=20
/ \
/ \=20
HSpice waveform at Transmitter
VS
=09
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=20
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