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Explorer
Explorer
134 Views
Registered: ‎10-12-2016

two constraint files have interdependencies ?

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Hi Friends, 

In UG903, page 13 mentioned as below. Can you pls provide a small example for interdependencies of two constraint files ?

The order of the constraint files matters. You must be sure that the constraints in each file do not rely on the constraints of another file. If this is the case, you must read the file that contains the constraint dependencies last. If two constraint files have interdependencies, you must either merge them manually into one file that contains the proper sequence, or
divide the files into several separate files and order them correctly.

Thank You 

S Sampath

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Moderator
Moderator
112 Views
Registered: ‎11-04-2010

Re: two constraint files have interdependencies ?

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Hi, @ssampath ,

An example for you:

Constraint file A.xdc contains the create_clock constraints:

create_clock -period 10 -name wbClk [get_ports wbClk]
create_clock -period 5 -name bftClk [get_ports bftClk]

Constraint file B.xdc contains the set_false_path constraint which will refer to the create_clock constraints in A.xdc. That's interdependency.

set_false_path -from [get_clocks wbClk] -to [get_clocks bftClk]

In this case, B.xdc has to be read after A.xdc.

 

 

 

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1 Reply
Moderator
Moderator
113 Views
Registered: ‎11-04-2010

Re: two constraint files have interdependencies ?

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Hi, @ssampath ,

An example for you:

Constraint file A.xdc contains the create_clock constraints:

create_clock -period 10 -name wbClk [get_ports wbClk]
create_clock -period 5 -name bftClk [get_ports bftClk]

Constraint file B.xdc contains the set_false_path constraint which will refer to the create_clock constraints in A.xdc. That's interdependency.

set_false_path -from [get_clocks wbClk] -to [get_clocks bftClk]

In this case, B.xdc has to be read after A.xdc.

 

 

 

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Don't forget to reply, kudo, and accept as solution.
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