Retrieving db_ports as timing path starting points in OpenROAD

[liangrj2014]

Timing path starting points can be either the CLK pins of registers or input ports. By using the following commands, we can retrieve all the OpenROAD db_pins that serve as starting points:

set startpoints [::sta::startpoints]
foreach startpoint $startpoints {
set start_point_pin [::sta::sta_to_db_pin $startpoint]
if { $start_point_pin == "NULL" } {
continue
}
....
}

However, I have encountered an issue where we are unable to obtain input ports using similar commands. The sta_to_db_port command referenced [here] (

OpenROAD/src/dbSta/src/dbSta.i

Line 99 in b565cb9

sta_to_db_port(Port *port)

) does not seem to function as we expected.

Could you kindly suggest an alternative method to retrieve db_ports that are starting points? Thanks in advance!

[maliberty]

Could you give a small test case showing the issue?

[maliberty]

Solved with #5559

[liangrj2014]

Great! Thanks!