The following table shows which families support this constraint and which file formats and tools you can use to enter or modify it:
|
Families |
SDC |
DCF |
I/O Attribute Editor |
PinEditor (non-MVN) |
|
Fusion |
X |
|
X |
|
|
ProASIC3E |
X |
|
X |
|
|
ProASIC3 |
X |
|
X |
|
|
ProASIC PLUS |
|
|
X |
|
|
Axcelerator |
X |
|
X |
|
|
ProASIC |
|
|
X
|
|
|
eX |
X |
X |
|
X |
|
SX-A |
X |
X |
|
X |
|
SX |
|
X |
|
X |
|
MX |
|
X |
|
X |
|
3200DX |
|
X |
|
X |
|
ACT3 |
|
X |
|
X |
|
ACT2/1200XL |
|
X |
|
X |
|
ACT1 |
|
X |
|
X |
Use this constraint to set the capacitance to a specified value on a specified port.
Delay on a given path depends on the load at the output pin of the device. For an accurate static timing analysis of a given design, it is important to set the load on the port which can be taken into account for delay calculations.
You can use one or more of the following commands or GUI tools to set the load on a port:
SDC - set_load
DCF - pin_loads
I/O Attribute Editor - Editing I/O Attributes
PinEditor (non-MVN) - Specifying Capacitance
SmartTime Constraints Editor GUI
Note: You can also set the output load using the pin_assign command in a Tcl script.