Verga++ is a Verilog simulator. It was developed by Jeffery P. Hansen as part of TkGate digital circuit editor and simulator.

This file contains notes on the internal commands sent between tkgate and the simulator verga.

Commands recognized by simulator:

$script <file>					Read a verilog script file
$show <net>					Show current value of net
$sendto <q> <value>				Put value in named channel
$cpath <n>					Do a critical path analysis
$set <net> <value>				Set a net to a value
$break <id> <expr>				Create a breakpoint
$delete_break <id>				Delete a breakpoint
$probe <net> [<who>]				Monitor a net
$unprobe <net> [<who>]				Remove a monitor from a net
$memload <fmt> <file> [<mem>]			Load a memory(s) from a file
$memdump <fmt> <file> <mem>			Dump a memory to a file.
$time						Report current time
$step [<n>]					Step simulator a number of epochs.
$addclock <net>					Register 'net' as a clock.
$stepclock <+/-> <ncycle> <nafter> [<gate>]	Step simulator a number of clock cycles.
$wait						Wait for all events to be executed.
$stop						Pause simulator.
$go						Put simulator in continuos mode.
$exit						Exit the simulator

Commands sent from simulator to tkgate: 

stop @ <t>					Indicate simulator is stopped
break <n> @ <t>					Indicate simulator is stopped at a breakpoint
time @ <t>					Report of current simulator
valueof <who> <net> <value>  @ <t>		Report value of a net to a tkgate listener
comment <text>					Comment command.  Ignored by tkgate.
echo <text>					Text to be displayed as is.
error file <text>				Error message with
error gate <gate> <text>			Error occuring related to a gate/module
error net <net> <text>				Error occuring related to a net
error run <text>				Run-time error report
error command <text>				Error in command from tkgate