[SI-LIST] Re: hspice questions
- From: "Jim (James) Antonellis" <janton@xxxxxxxxxxxx>
- To: "Siva kumar" <sivakumar_skm@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 18 Mar 2008 09:42:05 -0700
Hi Siva,
Many ways to "skin the cat", here are a couple:
If you have Cscope with your HSPICE (CosmosScope is a waveform viewer
also a Synopsys product) you can easily plot Eye Diagrams and measure
the zero-crossing of all transitions. Avanwaves is an older Synopsys
waveform viewer that can alos plot Eye diagrams and give you the zero
crossing measurement.
In regards to "sweeping" multiple parameters, Using the ".Data" and
".ALTER"
HSPICE constructs you can get any nested loop parameter sweep you
desire!
For example (this is only psuedo code from memory):
.tran STEP END sweep =3D foobar
.DATA foobar
param1 param2
x y
m n
a b
.ENDDATA
.ALTER
.del lib SLOW_PVT
.lib FAST_PVT
This example will produce 6 runs. The inner loop (.DATA) provides 3
sweeps=20
of param1 and param2. The outer loop (.ALTER) will add a second run with
a change in my process lib.
Jim Antonellis=20
janton@xxxxxxxxxxxx
Broadcom Corp www.broadcom.com
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Siva kumar
Sent: Tuesday, March 18, 2008 11:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] hspice questions
ladies and gentlemen,
i am a newbie to Hspice and i have few questions on it.
1. I have a differential clock output and i would like to measure the
signal crossing points (the time at which the clk_p and clk_n crossing
event occurs.). I went thru the user manuals and tutorials. Though there
are bunch of info on .MEASURE command, but i couldnt find a method to
find the crossing of clk_p and clk_n.
these values i need it to do the timing analysis.
2. My signals operates at 400mbps and i would like to generate the eye
diagram. how to do that using hspice.
can anybody give info on that?
3. I have one more question on Paramater sweep. I need to sweep two
variables in my circuit.=20
For example,
.tran 0.01ns 20ns sweep length1 100 1000 100 .tran 0.01ns 20ns sweep
length2 500 1000 250
i tried like above but always i am seeing only one variable in the
waveform.( if i sweep var1 and var2 using the above method, tr1 and tr2
results with var1 displayed but i dont know for which value of var2 the
sweep happened..
The objective is, i am doing the SI analysis and i want to sweep the
tracelengths of the topology.
I want to try like the following for loop and print both length1 and
length2.=20
for length1=3D100 to 1000 step 100
{
for length2=3D500 to 1000 step 25
}
thanking you in advance.
Also i would appreciate if anybody can share any advanced / complex
examples on SI analysis using hspice that helps to improve the
efficiency and saves time.
thanks,
kumar
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