[SI-LIST] Re: effects of propagation time with respect to rise time
- From: "Lynne D. Green" <lgreen22@xxxxxxxxxxxxxx>
- To: <johnmattfaq@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 14 Dec 2005 08:32:01 -0800
Hello, John,
Welcome to the wonderful world of signal integrity.
Rise time is not always equal to 10% of clk period. For example, when
people talk about "over clocking", they are talking about having the
half-period and the risetime being nearly equal.
In high speed boards, the risetime is commonly much less than the
propagation time. This is why interconnects must be treated as transmission
lines. Keep reading, because Eric does a great job of explaining
transmission line effects for digital signals.
Best regards,
Lynne
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of john matt
Sent: Tuesday, December 13, 2005 10:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] effects of propagation time with respect to rise time
Hi Gurus,
I am an Electronics student came to know about this wonderful forum
recently. Going through the archived topics I feel I am with right people to
clear my queries.
As suggested in the si-list archive I am going through Signal integrity
simplified by Eric. Few queries raised which may be basic but need your
advice on this.
I studied the rise time is approx equals to 10% of clock period. Also the
interconnect length contributes to the propagation time( time for signal to
reach from driver to load through interconnect) of the signal.
During signal switching from low to high or vice versa, do the propagation
time should always less than the rise time? If so, what effect will the
signal see for longer interconnect which makes propagation time greater than
rise time.
Thanks in advance for your help.
Thanks much,
John.
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