The following table shows which families support this constraint and which file formats and tools you can use to enter or modify it:
|
Families |
PDC |
GCF |
|
Fusion |
|
|
|
ProASIC3E |
|
|
|
ProASIC3 |
|
|
|
ProASIC PLUS |
|
X |
|
Axcelerator |
X |
|
|
ProASIC |
|
X |
|
eX |
|
|
|
SX-A |
|
|
|
SX |
|
|
|
MX |
|
|
|
3200DX |
|
|
|
ACT3 |
|
|
|
ACT2/1200XL |
|
|
|
ACT1 |
|
|
Use this constraint to set the level at which the place-and-route tool must keep instances connected to a net.
Net criticality is a guide for the place-and-route tool to keep instances connected to a net as close as possible at the cost of other (less critical) nets. Net criticality can vary from 1 to 10 with 1 being the least critical and 10 being the most. You can set a net's criticality to any number between 1 and 10 to help place-and-route tool prioritize its timing driven placement.
You can use one or more of the following commands or GUI tools to set net criticality:
PDC - set_net_critical
GCF - set_critical