need to fix max_transition violations?

[adrian_hu]

max_transition

Pin: U75/I

max_transition 2.00
- Transition Time 3.34
------------------------------
Slack -1.34 (VIOLATED)

and how? (above is the verbose violation report)

 

[logicdrag]

max_transition violated

General speaking, Max transition is one of DRC, you must fix this kind of violation before sign off

 

[doggybo]

One possible reason is this pin has a big loading or wire is too long.

you should find out the real reason first, then you can do something as sizing, moving , adding buffer or changing wire by hand to fix it

 

[haosg]

yes, it is DRC ,need be corrected.
and correcting it would improve delay.

 

[tony_taoyh]

The Max transition problem is also around me...

I am always not sure what "max_transition" should be apply on the design????

Any idea???

My thinking when transition reduce:
(1) transient power consumption reduce.
(2) circuit speed increase.
(3) Safe usage for DC library.

But:
(1) worse signal integrity problem.
(2) Big design area.

How to do the trade-off?????

Thanks...

 

[floatgrass]

use this command

compile -inc -only_drc_rule

 

[zyphor]

it depends, you need to do some analysis on the violations.

Some violations need not to be fixed if they do not harm to the delay greatly.