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Author: patel-soham

dynamic_pattern_imp.v

@@ -0,0 +1,43 @@
+// Dynamic pattern detector implicit style fsm
+module dyn_pattern_imp(clk, rst, valid, in, out, pattern);
+
+// N bit pattern detector
+parameter BITS = 5;
+
+input clk, rst, valid, in;
+input [BITS-1 : 0] pattern;
+output reg out;
+
+reg [BITS-1 : 0] buffer;
+integer count;
+
+always @ (posedge clk) begin
+	if (rst == 1) begin
+		buffer = 0;
+		out = 0;
+		count = 0;
+	end
+	else begin
+		if (valid == 1) begin
+			buffer = {buffer[BITS-2 : 0], in};
+			count = count + 1;
+			if (count == BITS) begin
+				if (buffer == pattern) begin
+					out = 1;
+					// ** NON-OVERLAPPING **
+					count = 0;
+					// ** OVERLAPPING **
+					//count = count -1;
+				end
+				else begin
+					out = 0;
+					count = count - 1;
+				end
+			end
+			else out = 0;
+		end
+		else out = 0;
+	end
+end
+
+endmodule

tb_dynamic_pattern_imp.v

@@ -0,0 +1,41 @@
+`include "dynamic_pattern_imp.v"
+module tb;
+
+parameter BITS=8; 
+
+reg clk, rst, valid, in;
+reg [BITS-1 : 0] pattern;
+wire out;
+
+
+dyn_pattern_imp # (.BITS(BITS)) u0 (.clk(clk), .rst(rst), .valid(valid), .in(in), .out(out), .pattern(pattern));
+
+always #1 clk = ~clk;
+
+initial begin
+	clk = 0;
+	valid = 0;
+	in = 0;
+	pattern = 0;
+
+	rst = 1;
+	repeat (5) @ (posedge clk);
+	rst = 0;
+
+	pattern = $random;
+	valid = 1;
+	repeat (300) begin
+		in = $random;
+		@ (posedge clk);
+	end
+	valid = 0;
+
+	rst = 1;
+	repeat (10) @ (posedge clk);
+	rst = 0;
+
+	repeat (5) @ (posedge clk);
+	$finish;
+end
+
+endmodule