HBLbits_Verilog Basic_Edgedetect
For each bit in an 8-bit vector, detect when the input signal changes from 0 in one clock cycle to 1 the next (similar to positive edge detection). The output bit should be set the cycle after a 0 to 1 transition occurs.
Here are some examples. For clarity, in[1] and pedge[1] are shown separately.
module top_module (
input clk,
input [7:0] in,
output [7:0] pedge
);
reg [7:0] d_last;
always @(posedge clk) begin
d_last <= in; // Remember the state of the previous cycle
pedge <= in & ~d_last; // A positive edge occurred if input was 0 and is now 1.
end
endmodule
input clk,
input [7:0] in,
output [7:0] pedge
);
reg [7:0] d_last;
always @(posedge clk) begin
d_last <= in; // Remember the state of the previous cycle
pedge <= in & ~d_last; // A positive edge occurred if input was 0 and is now 1.
end
endmodule
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