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TESTBENCH/barrel_shifter_tb.v

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+// Name: barrel_shifter_tb.v
+// Module: BARREL_SHIFTER32_TB
+//
+// Notes: - Testbench for shift module
+//
+// Revision History:
+//
+// Version	Date		Who		email			note
+//------------------------------------------------------------------------------------------
+//  1.0     Sep 10, 2014	Kaushik Patra	kpatra@sjsu.edu		Initial creation
+//------------------------------------------------------------------------------------------
+`include "../prj_definition.v"
+
+module BARREL_SHIFTER32_TB;
+reg [31:0] D;
+reg [31:0] S;
+reg LnR;
+wire [31:0] Y;
+
+integer reg_idx;
+reg [`DATA_INDEX_LIMIT:0] result[0:63];
+
+integer i, e;
+integer no_of_test=0;
+integer no_of_pass=0;
+
+SHIFT32 shift_inst(.Y(Y), .D(D), .S(S), .LnR(LnR));
+
+initial
+begin
+reg_idx=0;
+D=32'ha5a5a5a5;
+S=32'h00000000;
+LnR=1'b1; // left shift
+
+for(i=1; i<33; i=i+1)
+begin
+#5 
+no_of_test = no_of_test + 1;
+S=i; 
+e = D << S; 
+#5
+if (e !== Y)
+begin
+   $write("[TEST %2d] (%8x << %8x) = %8x, got %8x ... FAILED\n", no_of_test, D, S, e, Y);
+end
+else
+  no_of_pass = no_of_pass + 1;
+result[reg_idx] = Y; reg_idx=reg_idx+1;
+end 
+
+#5 LnR=1'b0; // right shift
+
+for(i=1; i<33; i=i+1)
+begin
+#5 
+no_of_test = no_of_test + 1;
+S=i; 
+e = D >> S; 
+#5
+if (e !== Y)
+begin
+   $write("[TEST %2d] (%8x >> %8x) = %8x, got %8x ... FAILED\n", no_of_test, D, S, e, Y);
+end
+else
+  no_of_pass = no_of_pass + 1;
+result[reg_idx] = Y; reg_idx=reg_idx+1;
+end 
+
+$write("\n");
+$write("\tTotal number of tests %d\n", no_of_test);
+$write("\tTotal number of pass  %d\n", no_of_pass);
+$write("\n");
+
+$writememh("./OUTPUT/barret_shifter_tb.out",result);
+
+$stop;
+end
+
+endmodule