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Short violation

skow over 11 years ago

I did a verifyGeometry right after placeDesign -prePlaceOpt and had 1000 short violations.

The messages are : SHORT:

Special Wire of Net VSS & Pin of Cell U7178 ( M1 )
Bounds : ( 277.600, 31.035 ) ( 280.600, 31.365 )

SHORT: Special Via of Net VDD & Pin of Cell U35043 ( M1 )
Bounds : ( 348.000, 14.835 ) ( 351.000, 15.165 )

The display showed the short aligned with the power stripes; I did the previous short violation's suggestion to ensure VDD, VSS are properly set. The standard cell is provided by foundry so it should be fine. Is there anything else I missed?

Kari over 11 years ago

what layer is the power stripe? what layers are the std cell pins?
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skow over 11 years ago

The power stripes(using special route to create for the standard cell tracks ) and cell pins use M1 Layer.
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Kari over 11 years ago

i thought you meant vertical stripes, sounds like you might be talking about the rails. you'll need to post a picture.
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skow over 11 years ago

Here is the display of short violations.
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skow over 11 years ago

I have
set rda_Input(ui_pwrnet) {vdd}
set rda_Input(ui_gndnet) {vss}
set rda_Input(PIN:VDD:) {vdd}
set rda_Input(PIN:VSS:) {vss}
set rda_Input(TIEHI::) {vdd}
set rda_Input(TIELO::) {vss}
and it failed the same so I use
globalNetConnect VSS -type pgpin -pin VSS -all -override
globalNetConnect VDD -type pgpin -pin VDD -all -override cmd again before the placement then verify geometry. The short violations are gone. Why the .conf did not work?
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Kari over 11 years ago

What are your pwr/gnd net names? Capital VDD/VSS or lower-case vdd/vss?
In the first case, you have lower-case. In the second, upper-case.
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skow over 11 years ago

I used loadConfig for the first one(vdd, vss) and it did not resolve the short violations.
I restart SOC to use Import design to use *.globals which has VDD, VSS.
In the *.globals file only has set init_pwr_net {VDD} and set init_gnd_net {VSS} so I tried the globalNetConnect again. Is there a script to covert *.conf to *.globals so all the parameters can be set?
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