FreeLists / si-list / [SI-LIST] Re: PCI relected wave waveform at Transmitter in SigXplorer

[steve weir <weirsp@xxxxxxxxxx>]

My guess is that you probed the driver to resistor junction, instead of the 
resistor to tx-line junction.

Steve.
At 11:59 AM 9/9/2004 -0700, V S wrote:
>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
>
>Vo = Vcc*Zo/(Zo+R)
>
>where R is the sum of the drive strength and the
>series termination resistance and
>
>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).
>
>
>            ____
>           /    \
>        __/      \__    ____ 2.58V
>       /            \
>      /              \
>     /                \
>    /                  \
>
>
>  SigXplorer waveform at Transmitter
>
>
>            ____
>           /    \
>          /      \
>       __/        \__   ____ 1.65 V
>      /              \
>     /                \
>    /                  \
>
>HSpice waveform at Transmitter
>
>
>VS
>
>
>
>
>
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