constant DUTY_CYCLE : real := <value_0.01_to_0.99>; --定义占空比系数 constant PERIOD : time := <value>; --定义时钟周期 --使用after语句 CLK <= '1' after (PERIOD - (PERIOD * DUTY_CYCLE)) when CLK = '0' else '0' after (PERIOD * DUTY_CYCLE); --使用wait语句 CLK <= '0'; ...
CLK <= '1' after (PERIOD - (PERIOD * DUTY_CYCLE)) when CLK = '0' else '0' after (PERIOD * DUTY_CYCLE); --使用wait语句 CLK <= '0'; wait for (PERIOD - (PERIOD * DUTY_CYCLE)); CLK <= '1'; wait for (PERIOD * DUTY_CYCLE); c)差分端口占空比为50% constant PERIOD : time...
ALL; entity debouncing_tb is end debouncing_tb; architecture tb of debouncing_tb is constant N: integer := 8; signal delay: std_logic_vector(N-1 downto 0); signal u, y,z : std_logic; signal clk, rst : std_logic; -- Clock period definitions constant Ts : time := 10 ns; begin...
constant PERIOD : time := <value>; --定义时钟周期 --使用after语句 CLK <= '1' after (PERIOD - (PERIOD * DUTY_CYCLE)) when CLK = '0' else '0' after (PERIOD * DUTY_CYCLE); --使用wait语句 CLK <= '0'; wait for (PERIOD - (PERIOD * DUTY_CYCLE)); CLK <= '1'; wait for ...
DELAY_PROC :process(clk) begin ifrising_edge(clk)then ifrst ='1'then sig_p1 <='0'; else sig_p1 <= sig; endif; endif; endprocess; The code above shows a fully synchronous process that creates a copy of a signal delayed by one clock cycle. This code will infer a singleflip-flop...
timer_s <= delay_65us_c; state <= wait_65us; ENDIF; WHENconvert_data => ---convert raw dataintotemperature--- o_temp_ready <='1'; WHENwait_65us => ---waitforread/write cycletofinish--- IF(timer_s =0)THEN state <= previous_state; ELSE timer...
Preventing over-read and overwrite is a common problem when creating data stream interfaces. The issue is that when two clocked logic modules communicate, each module will only be able to read the outputs from its counterpart with one clock cycle delay. ...
The delay is -- one master clock cycle long. output_flipflop: process(clk) begin if rising_edge(clk) then if (reset = '1') then flipflop_4 <= '0'; else flipflop_4 <= flipflop_3; end if; end if; end process output_flipflop; -- The delay is needed to create one short (...
A VHDL process is sequential (as opposed to combinatorial) when some assigned signals are not explicitly assigned in all paths within the process. The generated hardware has an internal state or memory (Flip-Flops or Latches). Recommended: Use a sensitiv
read data openmac.inWrite must be set to HIGH during the access. Synchronously to asserting the select and write strobes the address (openmac.iAddress) and byteenable qualifiers (openmac.inByteenable) must be set valid. After one cycle delay the valid data is presented at openmac.oReaddat...