What is the slack in synthesis results of SynplifyPRO?

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ahmadagha23

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synplifypro sythesizer

Hi
what is slack in synthesis results?

and how can I can understand RTL schematic results of synplifypro7.5?

thanks from your help
 

synplifypro sythesizer

Slack = Required Time of a signal at point(to tun at a particular frequency) - Actual arrival time of the signal.
A negative slack means.. your circuit wont run at the requested frequency.
 

Re: synplifypro sythesizer

Hi
I know but why it used?


thanks
 

synplifypro sythesizer

probably, must have : "your circuit won't run ..."
It changes a situation ?

Kukaz.
 

Re: synplifypro sythesizer

ahmadagha23 said:
Hi
I know but why it used?


thanks
Click to expand...

The slack is used for set/hold check, if the slack is negative, your circuit

can't run at the timing your want.

wang1
 

Re: synplifypro sythesizer

Hi
If the slack is negative I must change my circuit design or must change frequency requirement?

Why if I choose automatice frequency requirment mode for synthesis operation sometimes it give me negative slack times?

thanks?
 

Re: synplifypro sythesizer

ahmadagha23 said:
Hi
If the slack is negative I must change my circuit design or must change frequency requirement?

Why if I choose automatice frequency requirment mode for synthesis operation sometimes it give me negative slack times?

thanks?
Click to expand...

Hi ahmadagha23:

Yes, you have to modify you design or timing requirement to make the

slack>=0.

wang1
 

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