ICC help --- dc not loaded??

hi,
I'm not familiar with ICC, I used Astro before..
now I don't know why everytime I use derive_pg_connection to conncet P/G, ICC will prompt this:

derive_pg_connection -power_net VDD -power_pin VDD -ground_net VSS -ground_pin VSS
begin derive_pg_connection...
dc not loaded
--- connected 0 power ports and 0 ground ports
1

Click to expand...

anyone knows why?thanks!!!

what is ICC.
Details required for futher help.

kamranravian said:

what is ICC.
Details required for futher help.

Click to expand...

IC compiler from synopsys, a Place&Route tool...

sicheng163 said:

hi,
I'm not familiar with ICC, I used Astro before..
now I don't know why everytime I use derive_pg_connection to conncet P/G, ICC will prompt this:

anyone knows why?thanks!!!

Click to expand...

Hi
I don't know what does your error mean.

But I use derive_pg_connection to make logical connection between Power pings and power nets.

In my flow, first I create power pins and power nets through the UPF flow

then I make connections using

derive_pg_connection -create_nets

and then, after you did power network synthesis and you obtained your power straps
you connect them to cell's power/ground pins by

preroute_standard_cells

hope this help
good luck.