Create a VCD checkpoint (equivalent of Verilog $dumpall system task)
checkpoint_vcd [‑ports] [‑quiet] [‑verbose]
|Control extended vcd dump file.
|Ignore command errors
|Suspend message limits during command execution
checkpoint_vcd command inserts current HDL object signal values into the Value Change Dump (VCD) file. Nothing is returned. This Tcl command is the equivalent of the Verilog
$dumpall system task, providing the initial values of the specified signals.
VCD is an ASCII file containing header information, variable definitions, and value change details of a set of HDL signals. The VCD file can be used to view simulation result in a VCD viewer or to estimate the power consumption of the design. See the IEEE Standard for Verilog Hardware Description Language (IEEE Std 1364-2005) for a description of the VCD file format.
You must execute the
log_vcd commands before using the
checkpoint_vcd command. After you execute the
checkpoint_vcd command, run or rerun the simulation to capture the signal values.
-quiet - (Optional) Execute the command quietly, returning no messages from the command. The command also returns TCL_OK regardless of any errors encountered during execution.
-verbose - (Optional) Temporarily override any message limits and return all messages from this command.
The following is an example of the
checkpoint_vcd command where the command dumps signal values of specified HDL objects into the open VCD file: