1 files changed, 68 insertions, 0 deletions
diff --git a/sources/hdl/verilog/pop_count4.v b/sources/hdl/verilog/pop_count4.v
new file mode 100644
index 0000000..80bea46
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+++ b/sources/hdl/verilog/pop_count4.v
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+`timescale 1ns / 1ps
+//////////////////////////////////////////////////////////////////////////////////
+// Company: 
+// Engineer: 
+// 
+// Create Date: 12/19/2018 10:51:52 AM
+// Design Name: 
+// Module Name: pop_count4
+// Project Name: 
+// Target Devices: 
+// Tool Versions: 
+// Description: 
+// 
+// Dependencies: 
+// 
+// Revision:
+// Revision 0.01 - File Created
+// Additional Comments:
+// 
+//////////////////////////////////////////////////////////////////////////////////
+
+
+module pop_count4(
+  input [3:0] in,
+  output [2:0] out
+  );
+    
+  reg [2:0] out_r; 
+    
+  always @* begin
+    out_r = 3'd0;
+    case(in)
+      4'b0000:
+        out_r = 3'd0;
+      4'b0001:
+        out_r = 3'd1;
+      4'b0010:
+        out_r = 3'd1;
+      4'b0011:
+        out_r = 3'd2;
+      4'b0100:
+        out_r = 3'd1;
+      4'b0101:
+        out_r = 3'd2;
+      4'b0110:
+        out_r = 3'd2;
+      4'b0111:
+        out_r = 3'd3;
+      4'b1000:
+        out_r = 3'd1;
+      4'b1001:
+        out_r = 3'd2;
+      4'b1010:
+        out_r = 3'd2;
+      4'b1011:
+        out_r = 3'd3;
+      4'b1100:
+        out_r = 3'd2;
+      4'b1101:
+        out_r = 3'd3;
+      4'b1111:
+        out_r = 3'd4;
+    endcase  
+  end
+  
+  assign out = out_r;
+  
+endmodule