[SI-LIST] Re: flight time = propagation delay?
- From: "John Ellis" <jellis@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 15 Nov 2002 09:18:41 -0500
Craig,
Simply put, flight time is the time it takes the signal to travel from the
output of the driver to the input of the receiver.
John
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Clewell, Craig
Sent: Friday, November 15, 2002 8:57 AM
To: 'Andrew.Ingraham@xxxxxx'
Cc: [SI-LIST]; HouKevin@xxxxxxxxxx
Subject: [SI-LIST] Re: flight time = propagation delay?
Andy,
Oh if you want to be technically correct...
Prop delay is the absolute delay of a T-Line
Flight time is the difference between the reference waveform and the
waveform at the receiver.
CC
-----Original Message-----
From: Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxx]
Sent: Friday, November 15, 2002 8:47 AM
To: [SI-LIST]; HouKevin@xxxxxxxxxx
Subject: [SI-LIST] Re: flight time = propagation delay?
> flight is equal to propagation delay?
No.
Propagation delay might mean the silicon delay of a buffer.
Or it might mean the apparent wire delay from one IC output pin to an
input pin.
Or a combination of both. Or something else.
There are several ways to specify wire or net propagation delay, and you
can get a negative number depending on how it is done. But the flight
time of the electromagnetic signal is always positive.
Andy
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