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Is CDL netlist *.PININFO pin1:O pin2:I pin3:IO property a syntax requirement?

max123321 over 5 years ago

Trying to understand what tools read the direction of pins in the CDL netlist.

Is this syntax a requirement? Which tools will give out errors when reading the CDL without the directions?

Where can i find "Syntax manual" sort of guide for CDL format?

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Andrew Beckett over 5 years ago

CDL is documented in several places, but it's certainly in the PVS Developers Guide in a chapter called Physical Verification System and CDL. It's not a requirement, and I don't believe it's checked by physical verification tools as far as I know. It's been supported for a very long time (CDL originated with Dracula), but I don't recall Dracula ever checking pin direction information either - given that the direction couldn't be identified from the layout.

It is however used if you import a CDL netlist using File->Import->SPICE in Virtuoso to know which direction the resulting pins should be. SPICE itself doesn't have pin direction information, so this pragma is useful in that case.

Regards,

Andrew.
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Andrew Beckett over 5 years ago

CDL is documented in several places, but it's certainly in the PVS Developers Guide in a chapter called Physical Verification System and CDL. It's not a requirement, and I don't believe it's checked by physical verification tools as far as I know. It's been supported for a very long time (CDL originated with Dracula), but I don't recall Dracula ever checking pin direction information either - given that the direction couldn't be identified from the layout.

It is however used if you import a CDL netlist using File->Import->SPICE in Virtuoso to know which direction the resulting pins should be. SPICE itself doesn't have pin direction information, so this pragma is useful in that case.

Regards,

Andrew.
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max123321 over 5 years ago in reply to Andrew Beckett

Hi Andrew, thanks for the info. Where can I find the PVS Guide? Which EDA tool packages does it come with?
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Andrew Beckett over 5 years ago in reply to max123321

You'd find it in the PVS19.1 stream for example. Or on Cadence Online Support here

Andrew.
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