FPGA Verilog VHDL Courses

Verilog code for D Flip Flop

D Flip-Flop is a fundamental component in digital logic circuits. Verilog code for D Flip Flop is presented in this project. There are two types of D Flip-Flops being implemented which are Rising-Edge D Flip Flop and Falling-Edge D Flip Flop. 

Verilog code for D Flip Flop


Verilog code for Rising Edge D Flip Flop:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for rising edge D flip flop 
module RisingEdge_DFlipFlop(D,clk,Q);
input D; // Data input 
input clk; // clock input 
output Q; // output Q 
always @(posedge clk) 
begin
 Q <= D; 
end 
endmodule

Verilog code for Rising Edge D Flip-Flop with Synchronous Reset:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for Rising edge D flip flop with Synchronous Reset input 
module RisingEdge_DFlipFlop_SyncReset(D,clk,sync_reset,Q);
input D; // Data input 
input clk; // clock input 
input sync_reset; // synchronous reset 
output reg Q; // output Q 
always @(posedge clk) 
begin
 if(sync_reset==1'b1)
  Q <= 1'b0; 
 else 
  Q <= D; 
end 
endmodule

Verilog code for Rising Edge D Flip-Flop with Asynchronous Reset High Level:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for Rising edge D flip flop with Asynchronous Reset high
module RisingEdge_DFlipFlop_AsyncResetHigh(D,clk,async_reset,Q);
input D; // Data input 
input clk; // clock input 
input async_reset; // asynchronous reset high level
output reg Q; // output Q 
always @(posedge clk or posedge async_reset) 
begin
 if(async_reset==1'b1)
  Q <= 1'b0; 
 else 
  Q <= D; 
end 
endmodule

Verilog code for Rising Edge D Flip-Flop with Asynchronous Reset Low Level:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for Rising edge D flip flop with Asynchronous Reset Low 
module RisingEdge_DFlipFlop_AsyncResetLow(D,clk,async_reset,Q);
input D; // Data input 
input clk; // clock input 
input async_reset; // asynchronous reset low level 
output reg Q; // output Q 
always @(posedge clk or negedge async_reset) 
begin
 if(async_reset==1'b0)
  Q <= 1'b0; 
 else 
  Q <= D; 
end 
endmodule

Verilog code for Falling Edge D Flip Flop:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for falling edge D flip flop 
module FallingEdge_DFlipFlop(D,clk,Q);
input D; // Data input 
input clk; // clock input 
output reg Q; // output Q 
always @(negedge clk) 
begin
 Q <= D; 
end 
endmodule

Verilog code for Falling Edge D Flip-Flop with Synchronous Reset:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for Falling edge D flip flop with Synchronous Reset input 
module FallingEdge_DFlipFlop_SyncReset(D,clk,sync_reset,Q);
input D; // Data input 
input clk; // clock input 
input sync_reset; // synchronous reset 
output reg Q; // output Q 
always @(negedge clk) 
begin
 if(sync_reset==1'b1)
  Q <= 1'b0; 
 else 
  Q <= D; 
end 
endmodule

Verilog code for Falling Edge D Flip-Flop with Asynchronous Reset High Level:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for Falling edge D flip flop with Asynchronous Reset high
module FallingEdge_DFlipFlop_AsyncResetHigh(D,clk,async_reset,Q);
input D; // Data input 
input clk; // clock input 
input async_reset; // asynchronous reset high level 
output reg Q; // output Q 
always @(negedge clk or posedge async_reset) 
begin
 if(async_reset==1'b1)
  Q <= 1'b0; 
 else 
  Q <= D; 
end 
endmodule

Verilog code for Falling Edge D Flip-Flop with Asynchronous Reset Low Level:

// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Verilog code for Falling edge D flip flop with Asynchronous Reset low
module FallingEdge_DFlipFlop_AsyncResetLow(D,clk,async_reset,Q);
input D; // Data input 
input clk; // clock input 
input async_reset; // asynchronous reset low level 
output reg Q; // output Q 
always @(negedge clk or negedge async_reset) 
begin
 if(async_reset==1'b0)
  Q <= 1'b0; 
 else 
  Q <= D; 
end 
endmodule

Verilog Testbench code to simulate and verify D Flip-Flop:

`timescale 1ns/1ps;
// FPGA projects using Verilog/ VHDL 
// fpga4student.com
// Verilog code for D Flip FLop
// Testbench Verilog code for verification
module tb_DFF();
reg D;
reg clk;
reg reset;
wire Q;

RisingEdge_DFlipFlop_SyncReset dut(D,clk,reset,Q);

initial begin
  clk=0;
     forever #10 clk = ~clk;  
end 
initial begin 
 reset=1;
 D <= 0;
 #100;
 reset=0;
 D <= 1;
 #100;
 D <= 0;
 #100;
 D <= 1;
end 
endmodule

Simulation Waveform for D Flip-Flop:

Verilog code for D flip flop
This tutorial explains in detail the flip-flop schematic and how it works: HERE.
To understand more about setup and hold time of flip-flop, check it out HERE.
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