Note: In MVN tools, the column heading for this attribute is "Output load." In non-MVN tools, the column heading for this attribute is "Loading (pf)."
Purpose: Indicates the output-capacitance value based on the I/O standard selected in the I/O Standard cell. This option is not available in ACTgen.
|
Families |
Supported |
|
Fusion |
Yes |
|
ProASIC3E |
Yes |
|
ProASIC3 |
Yes |
|
ProASIC PLUS |
Yes |
|
Axcelerator |
Yes |
|
ProASIC |
Yes |
|
SX-A |
Yes |
|
SX |
Yes |
|
RTSX-S |
Yes |
|
eX |
Yes |
|
MX |
Yes |
Values: You can enter a capacitative load as an integral number of picofarads. 35pF is the default.
Default value: The default value is based upon the I/O specification set in the I/O Standard cell. If necessary, you can change the output capacitance default setting to improve timing definition and analysis. Both the capacitive loading on the board and the Vil/Vih trip points of driven devices affect output-propagation delay.
Timer, Timing-Driven Layout, Timing Report, and Back-Annotation automatically uses the modified delay model for delay calculations.