Gtkwave tutorial how to#

On the left hand select signals while holding Shift/Ctrl and hit Append on the bottom.

Gtkwave tutorial how to#

Launch GTKWave with the filename as argument: gtkwave full_adder_testbench.vcd The main goal of this guide is to show you how to view in GTKWave the values of the signals of your program in a more human way. If you select a speci c module in the hierarchy, you should see the wires and registers contained within that module in the lower left pane. You can use this window to browse the designвЂ™s module hierarchy using Signal Search Tree (SST) pane in the top left.

Installation Open a terminal and type (or copy-paste) the below commands. open it with GTKwave: gtkwave check.vcd & Figure 4 shows the GTKWave Waveform Viewer. Will contain the waveform data: ghdl -a full_adder.vhd GTKWave is the best free wave viewer and is the recommended viewer by Icarus Verilog developer. all entity full_adder_testbench is end full_adder_testbench architecture behavior of full_adder_testbench is component full_adder is port ( a : in std_logic b : in std_logic ci : in std_logic s : out std_logic co : out std_logic ) end component signal input : std_logic_vector ( 2 downto 0 ) signal output : std_logic_vector ( 1 downto 0 ) begin uut : full_adder port map ( a => input ( 0 ), b => input ( 1 ), ci => input ( 2 ), s => output ( 0 ), co => output ( 1 ) ) stim_proc : process begin input <= '000' wait for 10 ns assert output = '00' report '0+0+0 failed' input <= '001' wait for 10 ns assert output = '01' report '0+0+1 failed' input <= '010' wait for 10 ns assert output = '01' report '0+1+0 failed' input <= '100' wait for 10 ns assert output = '01' report '1+0+0 failed' input <= '011' wait for 10 ns assert output = '10' report '0+1+1 failed' input <= '110' wait for 10 ns assert output = '10' report '1+1+0 failed' input <= '111' wait for 10 ns assert output = '11' report '1+1+1 failed' report 'Full adder testbench finished' wait end process end Д®xecuting roughly following will generate full_adder_testbench.vcd which Consider following VHDL snippet: library ieee use ieee.std_logic_1164.