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Order of preference of serving false path and multicycle path

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biju4u90

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https://www.edaboard.com/threads/321098/

In the above post in this forum, it is said that false path will be given more preference over multicycle path by the STA tool. Why false path is given more priority?

It is said that the order of precedence is - Leftmost having higher priority.
SFP > MCP > SCP > SMT

What does SCP and SMT represent?
 

Hey,

False path constraint is much more strict, as you are saying that paths between launching and capturing flip flops will not exist, may be due to some architectural condition. Hence, tool will not time those paths.

I guess SCP is single cycle paths. I am not sure about SMT.

Thanks,
Abhishek


biju4u90 said:
https://www.edaboard.com/threads/321098/

In the above post in this forum, it is said that false path will be given more preference over multicycle path by the STA tool. Why false path is given more priority?

It is said that the order of precedence is - Leftmost having higher priority.
SFP > MCP > SCP > SMT

What does SCP and SMT represent?
Click to expand...
 

biju4u90 said:
https://www.edaboard.com/threads/321098/
Why false path is given more priority?
Click to expand...

I consider that tools are lazy but smart :D

If path is false, then no optimization needed.
If path is Multicycle, there is a little job to do.
Otherwise, path is normal single cycle, full of load to do for optimization.

So if a path is set to both false and multicycle, there is no choice better than doing nothing for that path to save runtime obviously.
Of course, in this case, you need to review your constraint carefully and answer why such situation happen ? or say bug in your constraint ??
 
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