FreeLists / si-list / [SI-LIST] Re: Question about Simulation in Spectraquest

[James Freeman <freeman@xxxxxxxxxxx>]

Hi Srinivas,
    The signal at the receiver is always of interest for signal quality
purposes and in the case of poorly documented receivers, the only way to
quantify the delay.

Thanks
Jim Freeman


"Venkataraman, Srinivas" wrote:

> The flight time will always remain the same and has nothing to do with a
> well or poorly behaved
> t-line. Whether the flight time is fast or slow depends
> only on the dielectric constant of the substrate. This confusion is caused
> because you are trying
> to bucket the driver delay, receiver delay and the interconnect delay in
> different bins. The best
> way would be to model the whole path, driver input->interconnect->receiver
> o/p and then quantify the
> impact of fast and slow skew corners of the devices.
>
> Srinivas
>
> -----Original Message-----
> From: Coleman, Dave [mailto:dave.coleman@xxxxxxxxx]
> Sent: Tuesday, August 07, 2001 7:44 AM
> To: 'we_r_frendz@xxxxxxxxx'; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Question about Simulation in Spectraquest
>
> Rahul,
>
> For a well-behaved transmission line circuit, you are correct - the fast
> corner conditions will yield the min flight time.  If you have a
> not-so-well-behaved circuit (i.e., have signal ringback across threshold),
> the fast corner conditions may cause the signal to settle later than for the
> slow corner conditions, so you CAN get a larger flight time with the fast
> corner conditions.
>
> Dave
>
> -----Original Message-----
> From: whiz kid [mailto:we_r_frendz@xxxxxxxxx]
> Sent: Monday, August 06, 2001 8:14 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Question about Simulation in Spectraquest
>
> Hi Gurus,
> I have a question about the usability of the values
> that spectraquest spits when doing a flight time
> simulation. When I am doing a simulation with a fast
> driver, fast transmission line, and fast reciever I am
> more concerned with the Min switch time (Min flight
> time). Is the settle time (max flight time) that SQ
> displays a use ful parameter here??. Because to find
> the max flight time u make use of the slow driver,
> slow line, slow reciever. Am I missing some thing in
> how to interpret the values.
>
> Regards,
> Rahul.
>
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