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Visitor
Visitor
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Registered: ‎04-18-2020

constraints 18-5257 - critical warning

hi,

I run Implementation and I have a critical warning [constraints 18-5257].

As I understand this warning means that there is a signal that goes into an Isolated pblock. ( I am learning to use IDF).

in my case, the specific signal that shown in the warning is NOT connected to the Isolated pblock in my design and still, there is a critical warning as shown in the attached file.

 

if someone knows what it means or had this warning once...I'll be happy to get some help.

thank you.

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Moderator
Moderator
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Registered: ‎11-04-2010

Hi, @prodanny1 ,

Please refer to UG1291:

IDF_VIV2-1 - Provenance
IDF_VIV2-1 is an advisory DRC documenting the circumstances of the run. It also validates
that the design has at least two partitions marked as isolated (using the HD.ISOLATED IDF Design Rule Checks
property).

Nets driven by cells marked HD.ISOLATED_EXEMPT are exempt from inter-region isolation rules and are listed in the IDF_VIV2-1 output.

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Visitor
Visitor
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Registered: ‎04-18-2020

hi,

 

all the IDF DRC checks, are O.K and there is no errors.

even though, I got this critical warnings after the Implementation.

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Moderator
Moderator
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Registered: ‎11-04-2010

Applying HD.ISOLATED_EXEMPT property on the global buffer cell can remove such types of warning.

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