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115 lines
3.6 KiB
VHDL
115 lines
3.6 KiB
VHDL
library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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library work;
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use work.common.all;
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use work.glibc_random.all;
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entity countzero_tb is
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end countzero_tb;
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architecture behave of countzero_tb is
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constant clk_period: time := 10 ns;
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signal rs: std_ulogic_vector(63 downto 0);
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signal is_32bit, count_right: std_ulogic := '0';
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signal result: std_ulogic_vector(63 downto 0);
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signal randno: std_ulogic_vector(63 downto 0);
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signal clk: std_ulogic;
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begin
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zerocounter_0: entity work.zero_counter
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port map (
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clk => clk,
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rs => rs,
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result => result,
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count_right => count_right,
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is_32bit => is_32bit
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);
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clk_process: process
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begin
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clk <= '0';
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wait for clk_period/2;
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clk <= '1';
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wait for clk_period/2;
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end process;
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stim_process: process
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variable r: std_ulogic_vector(63 downto 0);
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begin
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-- test with input = 0
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report "test zero input";
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rs <= (others => '0');
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is_32bit <= '0';
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count_right <= '0';
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wait for clk_period;
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assert result = x"0000000000000040"
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report "bad cntlzd 0 = " & to_hstring(result);
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count_right <= '1';
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wait for clk_period;
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assert result = x"0000000000000040"
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report "bad cnttzd 0 = " & to_hstring(result);
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is_32bit <= '1';
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count_right <= '0';
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wait for clk_period;
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assert result = x"0000000000000020"
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report "bad cntlzw 0 = " & to_hstring(result);
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count_right <= '1';
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wait for clk_period;
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assert result = x"0000000000000020"
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report "bad cnttzw 0 = " & to_hstring(result);
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report "test cntlzd/w";
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count_right <= '0';
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for j in 0 to 100 loop
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r := pseudorand(64);
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r(63) := '1';
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for i in 0 to 63 loop
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rs <= r;
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is_32bit <= '0';
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wait for clk_period;
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assert to_integer(unsigned(result)) = i
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report "bad cntlzd " & to_hstring(rs) & " -> " & to_hstring(result);
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rs <= r(31 downto 0) & r(63 downto 32);
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is_32bit <= '1';
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wait for clk_period;
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if i < 32 then
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assert to_integer(unsigned(result)) = i
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report "bad cntlzw " & to_hstring(rs) & " -> " & to_hstring(result);
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else
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assert to_integer(unsigned(result)) = 32
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report "bad cntlzw " & to_hstring(rs) & " -> " & to_hstring(result);
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end if;
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r := '0' & r(63 downto 1);
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end loop;
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end loop;
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report "test cnttzd/w";
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count_right <= '1';
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for j in 0 to 100 loop
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r := pseudorand(64);
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r(0) := '1';
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for i in 0 to 63 loop
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rs <= r;
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is_32bit <= '0';
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wait for clk_period;
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assert to_integer(unsigned(result)) = i
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report "bad cnttzd " & to_hstring(rs) & " -> " & to_hstring(result);
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is_32bit <= '1';
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wait for clk_period;
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if i < 32 then
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assert to_integer(unsigned(result)) = i
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report "bad cnttzw " & to_hstring(rs) & " -> " & to_hstring(result);
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else
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assert to_integer(unsigned(result)) = 32
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report "bad cnttzw " & to_hstring(rs) & " -> " & to_hstring(result);
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end if;
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r := r(62 downto 0) & '0';
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end loop;
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end loop;
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std.env.finish;
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end process;
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end behave;
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