QS之force(1)

force

　　This command allows you to apply stimulus interactively to VHDL signals(not variables), Verilog nets and registers, and SystemC boundary types. It is possible to create a complex sequence of stimuli when the force command is included in a DO file.

Syntax　　Forcing values, driver type, repetition time or stop time on an object　　

force {<object_name> <value> [[@]<time_info>][, <value> [@]<time_info>]...
[-deposit | -drive | -drive] [-cancel [@]<time_info>] [-repeat [@]<time_info>]

Arguments

1) <object_name>　　- specifies the name of the HDL object to be forced.

2) <value>

　　 

3) -cancel [@]<time_info>　　- (optional) cancel the force command at the time specified by <time_info>

4) -drive

　　- (optional) attach a driver to the object and drives the specified <value> until the object is forced again or until it is unforced

5) -deposit

　　- (optional) set the object to the specified <value>. The <value> remains until the object is forced again,or it is unforced

6) -freeze

　　- (optional) freeze the object at the specified <value> until it is forced again or until it is unforced with the noforce command.

　　- If the -freeze, -drive, or -deposit options are not used, then -freeze is the default for unresolved objects, and -drive is the default for resolved objects.

7) -repeat [@]<time_info>　　- (optional) repeat a series of forced values and times at the time specified.

8) [@]<time_info>

　　@　　　　

-cancel {520 ns}      \\ Relative Time
-cancel {@ 520 ns}    \\ Absolute Time

　　<tim_info> = <time_value> <time_unit>

  10ns
  10 ns
  {10 ns}
  “10 ns”