detect_lowest_high

12 detect_lowest_high/README.md

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+# detect_lowest_high <br />
+Created : 2021-5-20<br />
+Author : Rongye<br />
+Description : detect lowest high bit<br />
+<br />
+**.zip is the vivado project.**

12 detect_lowest_high/detect_lowest_high.v

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+`timescale 1ns / 1ps
+//==================================================================================================
+//  Filename      : detect_lowest_high .v
+//  Created On    : 2021-05-20
+//  Version       : V 1.0
+//  Author        : Rongye
+//  Description   : detect lowest high bit
+//  Modification  : 
+//
+//==================================================================================================
+
+module DETECT_LOWEST_HIGH(
+    // INPUTS
+        Din,           // 128bits
+    // OUTPUTS        
+        Dout          // 8 bits, MSB = 1 =>none of 1
+    );
+    input [127:0] Din;
+    output [7:0] Dout;
+
+    reg [7:0] Dout;
+
+    integer i;
+    always@(*)begin
+        Dout = 8'b1000_0000;
+        for(i=127;i>=0;i=i-1)
+            if(Din[i]==1'b1)
+                Dout = i;
+            else
+                Dout = Dout;
+    end    
+endmodule

12 detect_lowest_high/detect_tb.v

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+`timescale 1ns / 1ps
+`define     Clock      20 // clock cycle
+//////////////////////////////////////////////////////////////////////////////////
+// Company: 
+// Engineer: 
+// 
+// Create Date: 2021/05/20 09:42:55
+// Design Name: 
+// Module Name: DETECT_tb
+// Project Name: 
+// Target Devices: 
+// Tool Versions: 
+// Description: 
+// 
+// Dependencies: 
+// 
+// Revision:
+// Revision 0.01 - File Created
+// Additional Comments:
+// 
+//////////////////////////////////////////////////////////////////////////////////
+
+
+module DETECT_tb;
+    // INPUTS
+        reg [127:0] Din;               // posedge active
+    // OUTPUTS        
+        wire [7:0] Dout;          // 8 bits
+
+    DETECT_LOWEST_HIGH DETECT_LOWEST_HIGH_inst (
+    .Din        (Din      ),
+    .Dout      (Dout    )
+    );      
+
+    initial begin
+        #(`Clock*1);
+        Din = 128'd1213213;        // 100101000001100011101     Dout = 0
+
+        #(`Clock*5);   
+        Din = 128'd2223123513; // 10000100100000100010110000111001   Dout = 0
+
+        #(`Clock*5);  
+        Din = 128'd2; // 10     Dout = 1
+
+        #(`Clock*5);  
+        Din = 128'd4;  // 100   Dout = 2
+
+        #(`Clock*5);  
+        Din = 128'd8; // 1000   Dout = 3
+
+        #(`Clock*5);  
+        Din = 128'd4444; // 1000101011100   Dout = 2
+
+        $stop;
+    end
+endmodule
+