[SI-LIST] Clock skew measurement using XTK simulation tool
- From: Goutham.S@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx, Suchitha.V@xxxxxxxxxx,Ramesh.Reddy@xxxxxxxxxx
- Date: Wed, 18 Jul 2001 15:56:31 +0530
Hi,
(Embedded image moved to file: pic00253.pcx)
CY2210 is the clock driver. There are three receivers receiving three
different clocks.
They are clk_processor1, clk_processor1, clk_cnb. Let us consider skew beween
processor1 and CNB.
Practically skew between processor1 and CNB is the time difference between both
the waveforms on receiver
pins at processor1 and CNB at a particular voltage level.
Using simulation software (XTK), skew can be measured in two different
ways.
1.0 The first method is by calculating the flight time (ft1) between clock and
processor1.
Calculating the flight time (ft2) between clock and CNB.
skew = ft2 +/- ft1
2.0 The second method is measuring the time (t1) for clk_processor1 at
processor1 pin (receiver)
at some constant voltage level (vref).
Measure the time for clk_cnb (t2) at CNB pin (receiver) at the same
constant voltage level (vref).
skew = t1 +/- t2
Flight time varies with signal quality, so is it appropriate to calculate skew
according to the first method for skew validation?
Which is the best method?
Please suggest the better method for skew calculation.
regards
Goutham Sabavat
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