how to unset set_false_path

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billylee

Joined: 10 Sep 2009
Posts: 7
Location: Korea

22 Oct 2009 13:11 how to unset set_false_path

there are many clocks on my design
clk0 - clk50

so i want to set_false_path between all clocks

set clock_list [list clk0 clk1 .. clk50]
foreach each_clock1 $clock_list {
foreach each_clock2 $clock_list {
if { $each_clock1 != $each_clock2 } {
set_false_path -from [get_clock $each_clock1] -to [get_clock $each_clock2]
set_false_path -from [get_clock $each_clock2] -to [get_clock $each_clock1]
} else {
}}}

and now, how to unset false_path already defined
and how to make some kind of 'set_true_path' between clocks

BR

arjun1110

Joined: 03 Jul 2008
Posts: 76
Helped: 2
Location: Bangalore,India

23 Oct 2009 7:15 Re: how to unset set_false_path

Hello Billylee,

To undo a set_false_path command, use the reset_path
command with similar options. For example, enter

dc_shell> set_false_path -setup -from IN2 -to FF12/D
dc_shell> reset_path -setup -from IN2 -to FF12/D

Regards,

billylee

Joined: 10 Sep 2009
Posts: 7
Location: Korea

23 Oct 2009 7:22 Re: how to unset set_false_path

thanks a lot Smile

I found good answer on this site such as
'A good paper to check out is "Complex Clocking Situations Using PrimeTime".
Just google that title.
http://www.edaboard.com/viewtopic.php?t=112675&highlight=setfalsepath'

and solvenet
Key word : set_clock_groups
https://solvnet.synopsys.com/retrieve/004693.html?otSearchResultSrc=advSearch&otSearchResultNumber=8&otPageNum=1
or
https://solvnet.synopsys.com/retrieve/004319.html?otSearchResultSrc=advSearch&otSearchResultNumber=6&otPageNum=1

have a goodday Smile