RE: [IBIS-Users] maximum current flows

Hello yylau,

I think the problem can be resolved by doing the folowing:
1)In your s2i file check out for the name of your output buffer under
the pins header.
for eg.
[Pin]
1 dout dout output
In this case the output buffer name is "dout"

2)Once you know this,you then open the netlist.sp and add the following
statement :

rohm dout dout_pad 2.0

What this statement does is that it will insert a resistance of 2.0ohms
between your old output buffer "dout" and your new output buffer named
"dout_pad"
This will help you reduce the high currents you are getting and should
eliminate all the errors during ibischk.

3)After making this change in the netlist.sp go back to the s2i file and
change the name of the output buffer to dout_pad as this is your new
output buffer.
4)You can now run the s2ibis script.

The value of the resistance can be adjusted till you get the desired
result.


Hope this helps.

regards,
Nilimp Bhatt
________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of lau yy
Sent: Wednesday, June 01, 2005 11:19 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] maximum current flows


Dear ALL,

Recently, I have faced the maximumcurrent flows warning. Do anyone know
what actual the main cause?

I suspect is the R package/ R _pin value that is too small. I try to
replace some larger value
and simulate again. I found that the problems gone. Is it that mean the
problem cause by the R?

Below are the message the shown after use ibischk3.

WARNING - Model 'A22': Extreme currents present in TYP GND_Clamp VI
Curve
(-23.94A @ -1.5V)
 WARNING - Model 'A22': Extreme currents present in MIN GND_Clamp VI
Curve
(-26.24A @ -1.5V)
 WARNING - Model 'A22': Extreme currents present in MAX GND_Clamp VI
Curve
(-22.08A @ -1.5V)
 WARNING - Model 'OEB': Extreme currents present in TYP GND_Clamp VI
Curve
(-15.92A @ -1.5V)
 WARNING - Model 'OEB': Extreme currents present in MIN GND_Clamp VI
Curve
(-17.48A @ -1.5V)
 WARNING - Model 'OEB': Extreme currents present in MAX GND_Clamp VI
Curve
(-14.66A @ -1.5V)
 WARNING - Model 'CLK': Extreme currents present in TYP GND_Clamp VI
Curve
(-3.133e+11A @ -1.5V)
 WARNING - Model 'CLK': Extreme currents present in MIN GND_Clamp VI
Curve
(-4.438e+10A @ -1.5V)
 WARNING - Model 'CLK': Extreme currents present in MAX GND_Clamp VI
Curve
(-3.558e+12A @ -1.5V)

Any comments on this?


Rdgs
YYLAU
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