上一篇笔记指路75.D flip-flop首先简单复习一下D触发器(D flip-flop)。其逻辑功能为:当下一个clk上升沿(或下降沿)到来的时候,输出时序图如下:图片来自百度题目:Create a single D flip-flop.(构建一个D触发器)注:在前面的学习中,已经提到过,在verilog中,时序逻辑电路也是用always语句构建的。基本语法如下:alwa...
分析:在边沿检测的过程中,通过 1 个寄存器 reg 来寄存上一个时钟沿的输入值 D ,当寄存器输出 Q 与输入 D 的值分别为1、0时,证明检测到下降沿。本题中的D就是in,r1就是Q,区别就是,上图检测的是下降沿,本题检测上升沿。module top_module ( input clk, input [7:0] in, output [7:0] pedge );...
A binary ripple counter is generally using bistable multivibrator circuits so that cache input applied to the counter causes the count to advance or decrease. A basic counter circuit is shown in Figure 1 using two triggered (T-type) flip flop stages. Each clock pulse applied to the T-input ...
counters give output so as to count the number of clock pulses applied to them. Generally counters consist of an arrangement of flip-flops and can be a Asynchronous counter where output of one flip flop is the clock signal for the adjacent one ,...
Construction methods for ternary logic circuits and ternary tri-stable flip-flops, using ternary basic operational circuits composed only of CMOS-ICs have been reported. This paper discusses the construction methods for ternary sequential circuits, such as ternary counters, using those ternary logic ...
flip-flop. thus, the transition of clock pulses occurs simultaneously in each flip-flop which helps in the reduction of delay of the counter. like asynchronous counters, synchronous counters can also be designed using jk, d, or t flip-flops. 1. design 3-bit synchronous binary up-counter or...
1 //T flip flop 2 module t_ff(t,clk,rst_n,q); 3 input t,clk,rst_n; 4 outputreg q; 5 6 always @(posedge clk) 7 begin 8 if(!rst_n) 9 q<=0; 10 else 11 begin 12 if(t==1'b1) 13 q<=~q; 14 else 15 q<=q; ...
Shift Registers – Serial-in Serial-out A basic four-bit shift register can be constructed using four D flip-flops. The operation of the circuit is as follows. The register is first cleared, forcing all four outputs to zero. The input data is then applied sequentially to the D input of ...
(i.e. there is still an outstanding interrupt). If there are no outstanding interrupts, the contents of the sequence counter and interrupt registers are interchanged and the EI flip-flop is reset to a binary ZERO causing the compatibility feature circuits to return to normal processing. When ...
Using one J-K flip-flop for each output bit, however, relieves us of the necessity of having a symmetrical clock signal, allowing the use of practically any variety of high/low waveform to increment the count sequence. As indicated by all the other arrows in the pulse diagram, each succeed...