From d7a11e0e8584e088921c9486c4f064eaf5e004f7 Mon Sep 17 00:00:00 2001
From: Brian Woods
Date: Fri, 24 Feb 2023 12:17:46 -0500
Subject: counter: simple simulation of a counter

---
 counter/simulation.vhd | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 counter/simulation.vhd

(limited to 'counter/simulation.vhd')

diff --git a/counter/simulation.vhd b/counter/simulation.vhd
new file mode 100644
index 0000000..4fbb228
--- /dev/null
+++ b/counter/simulation.vhd
@@ -0,0 +1,97 @@
+-- SPDX-FileCopyrightText: 2023 Brian Woods
+-- SPDX-License-Identifier: GPL-2.0-or-later
+
+library IEEE;
+use IEEE.std_logic_1164.all;
+use IEEE.numeric_std.all;
+
+entity simulation is
+end;
+
+architecture sim of simulation is
+	component top is
+	port(
+		set: in std_logic;
+		set_val: in unsigned(7 downto 0);
+		cnt: out unsigned(7 downto 0);
+		en: in  std_logic;
+		clr: in std_logic;
+		cnt_auto: out unsigned(7 downto 0);
+		clk: in std_logic
+	);
+	end component;
+
+	signal set: std_logic := '0';
+	signal set_val: unsigned(7 downto 0) := "00000000";
+	signal cnt: unsigned(7 downto 0);
+	signal en:  std_logic := '0';
+	signal clr: std_logic := '0';
+	signal cnt_auto: unsigned(7 downto 0);
+	signal clk: std_logic := '0';
+begin
+	dut: top port map(
+		set => set,
+		set_val => set_val,
+		cnt => cnt,
+		en => en,
+		clr => clr,
+		cnt_auto => cnt_auto,
+		clk => clk
+	);
+
+	clk <= not clk after 5 ns;
+	-- clr <= '1', '0' after 20 ns;
+	-- en  <= '0', '1' after 10 ns;
+
+	-- clk_proc: process begin
+	-- begin
+	-- end process clk_proc;
+
+	process begin
+		-- at 0 ns
+		set <= '0';
+		set_val <= "00000000";
+		en <= '0';
+		clr <= '1';
+		wait for 10 ns;
+
+		-- at 10 ns
+		set <= '0';
+		set_val <= "00000000";
+		en <= '1';
+		clr <= '1';
+		wait for 10 ns;
+
+		-- at 20 ns
+		set <= '0';
+		set_val <= "00000000";
+		en <= '1';
+		clr <= '0';
+		wait for 80 ns;
+
+		-- at 100 ns
+		set <= '1';
+		set_val <= "00100000";
+		en <= '1';
+		clr <= '0';
+		wait for 10 ns;
+
+		-- at 110 ns
+		set <= '0';
+		set_val <= "00000000";
+		en <= '1';
+		clr <= '0';
+		wait for 100 ns;
+
+		-- at 210 ns
+		set <= '0';
+		set_val <= "00000000";
+		en <= '0';
+		clr <= '0';
+		wait for 10 ns;
+
+		-- end sim
+		wait;
+	end process;
+
+end sim;
-- 
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