latch的最大缺点就是没有时钟端,和当前我们尽可能采用时序电路的设计思路不符。 latch是电平触发,相当于有一个使能端,且在激活之后(在使能电平的时候)相当于导线了,随输出而变化,在非使能状态下是保持原来的信号,这就可以看出和flip-flop的差别,其实很多时候latch是不能代替ff的 1.latch对毛刺敏感 2.在ASIC中使...
always@(posedge clk or negedge rst_n) begin if(!rst_n) dout<=1'b0; else dout<=din; end endmodule 2. DFF with Async reset module dff1(clk,rst_n,din,dout) input clk; input rst_n; input din; output dout; reg dout; always@(posedge clk or negedge rst_n) begin if(!rst_n) dou...
💭 写在前面:本章将理解 RS/D 锁存器的概念,了解 RS/D/JK 触发器的概念,使用 Verilog 实现各种锁存器 (Latch) 和翻转器 (Flip-Flop),并通过 FPGA 验证用 Verilog 的实现。 📜 本章目录: Ⅰ. 前置知识回顾 0x00 锁存器(Latch) 0x01 RS 触发器(RS Flip-Flop) 0x02 D 触发器(D Flip-Flop) ...
I'm attempting to write a specific version of the D Flip Flop that uses NOR gates only: Following is gate level diagram: The code I'm using in Verilog: module DFlipFlop(D,CLK,Q,QN); input D, CLK; output Q, QN; reg Q, QN, R, S; always @(negedge CLK) begin R = ~(~(~(...
Then, we will show how to implement multi-bit flip-flop methodology using gated drive tree by XILINX Design Compiler. Experimental results indicate that multi-bit flip-flop using gated drive tree is very effective and efficient method in lower -power designs.V.GOUTHAM KUMAR...
看别人的吧:Verilog code for D flip-flop - All modeling styles (technobyte.org)Verilog: T flip flop using dataflow model - Stack Overflow 我倾向于认为Verilog的<=没那么强; 它可以偷偷地把 q <= ~((enable & reset) | q_); 换成if嘛。
q <= p;endalways @(negedge clk)beginp <= o;endendmodule This DFF seems to work just fine when I test it directly. But when I reused it to create a Bit (a memory cell), it gets crazy. Interestingly, the craziness is different using Icarus Verilog or EDAPlayground (which uses VCS)...
仿真文件源代码 `define SYS_CLOCK 20moduletest;regr;regclk;regd;wireq;initialbeginclk=0;d=0;r=1;#100r=0;d=1;#100r=1;#100d=0;endalways#(`SYS_CLOCK/2)clk<=~clk;D_type_flip_floptest_DFF(.d(d),.r(r),.clk(clk),.q(q));endmodule...
Verilog T Flip Flop Design moduletff(inputclk,inputrstn,inputt,outputregq);always @(posedgeclk)beginif(!rstn)q<=0;elseif(t)q<=~q;elseq<=q;endendmodule Testbench moduletb;regclk;regrstn;regt;tff u0(.clk(clk),.rstn(rstn),.t(t),.q(q));always#5clk=~clk;initialbegin{rstn,clk,...
Assume that you want to implement hierarchical Verilog code for this circuit, using three instantiations of a submodule that has a flip-flop and multiplexer in it. Write a Verilog module (containing one flip-flop and multiplexer) namedtop_modulefor this submodule. ...