Dracula LVS errors: power node and ground node are not specified

[Jing]

I use Dracula to run LVS. In the final .lvs result file. I got such warning.

POWER NODE IS NOT SPECIFIED

GROUND NODE IS NOT SPECIFIED

*/W* WARNING: NO POWER ON LAYOUT SIDE
*/W* WARNING: THEN THE POWER NODE MAY BE ASSIGNED DIFFERENT SCHEMATIC NAME.


*/W* WARNING: NO GROUND ON LAYOUT SIDE
*/W* WARNING: THEN THE GROUND NODE MAY BE ASSIGNED DIFFERENT SCHEMATIC NAME.


I did label and pin the vdd and gnd. why it happened?

 

[Fom]

Re: Dracula LVS errors

It is only warnings not errors.
Did you define POWER-NODE and GROUND-NODE in description block (in the beginning yours LVS command file?

 

[Hughes]

Dracula LVS errors

Define POWER-NODE and GROUND-NODE in you LVS command file, or add suffixes "" ":G" to the labels.