I am a complete beginner in VHDL, so I was hoping that someone could help me with this project I am working on. I need to realize rectangular pulse generator which frequency can be changed in the range 0 through 255. Frequency value in kHz must be shown binary on 8 LED diodes on the development board. Binary-Up-Down-Counter| Counters| VHDL. To make the code a little bit different, the counter output signal Q is declared as an integer that ranges from 0 to. For adjusting the output pulse frequency two buttons are used(incrementing/decrementing). When the button is held down for more than a second, the frequency is automatically incrementing/decrementing. I wrote some code, but in Xilinx I get a ton of warnings. Can somebody explain them to me? The second process of your state machine is the culprit. A process should be either synchronous or combinational, not a mix of both. ![]() A synchronous process has this form: process(reset, clk) begin if (reset = '0' then signals. Can't see the video? CPLD Board Configuration It is necessary to have a clock pulse supplied to the CPLD for this tutorial.
This is supplied to pin P7 of the CPLD from the AVR on the home built CPLD board as described in. Binary Counter VHDL Code The VHDL code listing for the binary counter is shown below. Library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity binary_counter_top is Port ( CLK: in STD_LOGIC; LED: out STD_LOGIC_VECTOR (7 downto 0)); end binary_counter_top; architecture Behavioral of binary_counter_top is signal CLK_DIV: std_logic_vector (2 downto 0); signal COUNT: std_logic_vector (7 downto 0); begin -- clock divider process (CLK) begin if (CLK'Event and CLK = '1') then CLK_DIV. 8-bit ArmiesAn up/down counter is written in VHDL and implemented on a CPLD. The VHDL while loop as well as VHDL generic are also demonstrated. Four different VHDL up/down counters are created in this tutorial: • Up/down counter that counts up to a maximum value and then wraps around to 0. Counts down to 0 and then wraps around to a maximum value. • Up/down counter that counts up to a maximum limit then stops. Counts down to 0 then stops. Demonstrates the VHDL while loop. • Up/down counter that demonstrates the use of a single VHDL generic. • Up/down counter that demonstrates the use of two VHDL generic values. Continuous Up/Down Counter This counter will continuously count up and wrap around to 0 when the maximum value is reached if the direction input to the counter is set to count up. 8-bit CreatorThe counter will continuously count down and wrap around to the maximum value when 0 is reached if the direction input to the counter is set to count down. This video shows the continuous up/down counter in operation. 8-bit ColorCan't see the video? Can't see the video? VHDL Code for up_dn_counter2 The VHDL code for the up/down counter with limits is shown here. Library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity up_down_counter2 is Port ( CLK: in STD_LOGIC; DIR: in STD_LOGIC; LED: out STD_LOGIC_VECTOR (7 downto 0)); end up_down_counter2; architecture Behavioral of up_down_counter2 is signal clk_div: STD_LOGIC_VECTOR (5 downto 0); signal count: STD_LOGIC_VECTOR (7 downto 0); begin -- clock divider process (CLK) begin if (CLK'Event and CLK = '1') then clk_div 0) loop count. Up/Down Counter using One VHDL Generic A generic is a named value that is put in the entity part of the VHDL code. Revelation 1 commentary in easy simple.
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