Vhdl Program For 8 Bit Up Down Counter D

Library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_signed.all; entity counter is port(CLK, CLR: in std_logic; output: inout std_logic_vector(3 downto 0)); end counter; architecture archi of counter is signal tmp: std_logic_vector(3 downto 0); begin process (CLK, CLR) variable i: integer:=0; begin if (CLR='1') then tmp. Needs to operate off one clock edge Because your counter port has clk in it, we can assume you want the counter to count synchronous to the clock. You're operating off of both clock edges elsif (clk = '1') then should be something like elsif clk'event and clk = '1' then or elsif rising_edge(clk) then These examples use the rising edge of clk. You can't synthesize something that uses both clock edges under the IEEE-1076.6 IEEE Standard for VHDL Register Transfer Level (RTL) Synthesis.

Verilog source code for a up down counter which can count up or down. VHDL Programs. Verilog program for 8bit Up down counter Verilog program for 8bit.

It's not a recognized clocking method. Making a modulo 10 counter Under the assumption you want the counter to go from 0 to 9 and rollover this for i in 0 to 6 loop tmp '0'); # equivalent to '0000' else tmp.

I have this code for a t-flip flop: library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED. Serial Youtube Music Downloader Key. ALL; entity tff is Port ( clk: in STD_LOGIC; enable: in STD_LOGIC; t: in STD_LOGIC; q: out STD_LOGIC); end tff; architecture Behavioral of tff is signal q_reg: std_logic; signal q_next: std_logic; begin process(clk) begin if (enable = '1') then q_reg. Your tff enable is actual expressed as an asynchronous reset although it is not in the process sensitivity list. The actual enable is the t input (toggle enable) which controls the multiplexer you connected in front of a D flipflop. 3d Plants For Sketchup here. You could make it a synchronous reset, I left it as an asynchronous reset in the following.