Stats

Locked Locked
Replies 6
Subscribers 96
Views 13862
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

[Innovus] report the fanout of ICG

hammercui over 3 years ago

I am looking for one way to report the ICG fanout status, below pic is the example of the ICG connection

I could get the fanout count of ICG a :

> sizeof_collection [all_fanout -from a -endpoints_only] , then I will get 100+200+300+3(b,c,d)

Now, I want to get the regs count from a: 100; and b's fanout of regs: 200 and c's fanout of regs :300 respectively.

Any comments will be appreciated

hammercui over 3 years ago

+ more, actually I am looking for one way to ask tool to stop tracing at the first sub level ICG when I report the fanout from one point
Cancel
Vote Up 0 Vote Down

Cancel
DimoM over 3 years ago in reply to hammercui

Hi,
all_fanout has the switches -levels and -pin_levels , which you can use for this purpose.

-Dimo
Cancel
Vote Up 0 Vote Down

Cancel
hammercui over 3 years ago in reply to DimoM

Thanks Dimo

But it seems, that the -levels include all kinds of gate, for my case, I hope it by pass all combinational logic ....
Cancel
Vote Up 0 Vote Down

Cancel
DimoM over 3 years ago in reply to hammercui

I see what you mean now.

The easiest way that comes in mind is to use set_case_analysis on the CP pin of the ICG. Then all_fanout won't trace trough it.

E.g.
set_interactive_constraint_modes [get_db constraint_modes .name]
set_case_analysis 0 b/CP

all_fanout -from a -endpoints_only

# Remove case analysis after that
reset_case_analysis b/CP
set_interactive_constraint_modes {}
Cancel
Vote Up 0 Vote Down

Cancel
hammercui over 3 years ago in reply to DimoM

Hi DimoM

Thanks for your comments, yes, by this way I could get the end point (fanout) count for each ICG, but the limitation is we can not trace the relationship between ICGs

I mean, I can not trace : ICG a drives b, and b drives c, and c drives d .....
Cancel
Vote Up 0 Vote Down

Cancel
hammercui over 3 years ago in reply to hammercui

Innovus should provide one feature to report the ICG tree, which only include ICG and other sequential cells
Cancel
Vote Up 0 Vote Down

Cancel

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.