Altera Quartus II Scripting - Manual (Page 628)

3–498 Chapter 3: Tcl Packages & Commands
timing_assignment
Quartus II Scripting Reference Manual © July 2013 Altera Corporation
set_output_delay
Usage
set_output_delay [-clk_ref ] [-clock_fall] [-comment ] [-disable]
[-max] [-min] [-remove] [-tag ] -to
Options
-clk_ref : Reference clock name
-clock_fall: Option to specify that delay is relative to falling edge of reference clock
-comment : Comment
-disable: Option to disable assignment
-max: Option to set maximum delay
-min: Option to set minimum delay
-remove: Option to remove output delay requirement
-tag : Option to tag data to this assignment
-to : Output pin name or output assignment group
: Delay value after rise of reference clock
Description
Specifies the required minimum or maximum delay on the output pin or output assignment group as
specified by the "-to" option. The Quartus II®timing analysis propagates this delay and checks it against
the actual delay. For more information about assignment groups, type "assignment_group -h".
The "assignment_group" command replaces the deprecated "timegroup" command in ::quartus::project,
version 5.0.
If both "-min" and "-max" options are not used, then the assignment is set for both minimum and
maximum delay.
The "-clock_fall" option specifies that the output delay is relative to the falling edge of the reference clock.
The rising edge of the reference clock is the default.
The is the output delay after the rise or fall of the reference clock. If you do not specify the
"-clk_ref" option, all clocks are assumed to be reference clocks by default.
The format of is "", for example, "7.55ns".
The following table displays available time units:
Time Unit Description
s second(s)
ms millisecond(s)
us microsecond(s)
ns nanosecond(s)
ps picosecond(s)
fs femtosecond(s)
Hz Hertz
KHz KiloHertz