[SI-LIST] Re: Question about Simulation in Spectraquest
- From: "Venkataraman, Srinivas" <srinivas.venkataraman@xxxxxxxxx>
- To: "Coleman, Dave" <dave.coleman@xxxxxxxxx>,"'we_r_frendz@xxxxxxxxx'" <we_r_frendz@xxxxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Tue, 7 Aug 2001 11:06:36 -0700
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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