Altera Quartus II Scripting - Manual (Page 617)

Chapter 3: Tcl Packages & Commands 3–487
timing_assignment
© July 2013 Altera Corporation Quartus II Scripting Reference Manual
create_relative_clock
Usage
create_relative_clock -base_clock [-comment ] [-disable] [-divide
] [-duty_cycle ] [-entity ] [-invert] [-multiply ]
[-no_target] [-offset ] [-phase_shift ] [-tag ] [-target ]
[-virtual]
Options
-base_clock : Base clock name
-comment : Comment
-disable: Option to disable assignment
-divide : Base clock division factor
-duty_cycle : Duty cycle
-entity : Entity to which to add clock assignment
-invert: Option to invert base clock
-multiply : Base clock multiplication factor
-no_target: Option to not assign clock to node
-offset : Offset from base clock
-phase_shift : Phase shift from base clock
-tag : Option to tag data to this assignment
-target : Clock node name
-virtual: Option to specify the clock as a virtual clock
: Clock name
Description
Creates a relative clock that derived from the absolute clock.
The "-offset" option can take the format:
For example, if the offset is 10.55ns, "10.55" is the and "ns" is the .
The following table displays possible time units:
Time Unit Description
s second(s)
ms millisecond(s)
us microsecond(s)
ns nanosecond(s)
ps picosecond(s)
fs femtosecond(s)