To set a default define option while allowing it to be overridden from the command line.
`ifndef mode_sel
`define mode_sel …Other articles
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"Verilog: shm waveforms"
The best practice is to use a tcl file:
shm.tcl
read moredatabase -open waves -shm probe -create your_top_level -depth all …"Verilog Timeformat"
Time can be displayed during simulation using
%t.$display("%t", $realtime);Timeformat is used to control the way (
read more%t) this …"SystemVerilog: Constrained Random"
A minimal example of constrained random to constraining a 4 bit value to 0 to 11 when randomised.
read moremodule tb …"Verilog: Thermometer Code"
Efficiently create a thermometer code in verilog:
read morelocalparam M = 32; function [M-1:0] therm_code; input [$clog2(M):0] val; begin …"Verilog: Calculate primes"
"Verilog: Timeout"
To wait for a maximum of
10nsfor positive edge on clk then carry on with simulation.read morefork : wait_or_timeout begin …"Verilog importing envvar"
Based on a Stackoverflow answer, to import environment variables into Verilog you can use:
read moreimport "DPI-C" function string getenv(input …"$display without a line return"
In Verilog to output to stdout without a line return use
$write();Equivalent statements :
read more$write("\n"); $display("");"Navigate Verilog with VIM"
Using
gfIn your vimrc
read more" gf goto_file, automatically add search for these file extensions :set suffixesadd+=.v :set suffixesadd+=.sv …Tasks Using Absolute Delays
As previously mentioned SystemVerilog introduced abolute delays in the form of
read more#1s;,#1ms,#1us,#1ns. Using these as values passed …