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Labs/03. Register file and memory/tb_data_mem.sv

@@ -21,8 +21,9 @@
 
 module tb_data_mem();
 
-parameter ADDR_SIZE = 4096;
+parameter ADDR_SIZE = 16384;
-parameter TIME_OPERATION  = 50;
+parameter TIME_OPERATION  = 20;
+parameter STEP = 8;
 
     logic        CLK;
     logic        REQ;
@@ -36,14 +37,12 @@ parameter TIME_OPERATION  = 50;
     .mem_req_i      (REQ),
     .write_enable_i (WE ),
     .addr_i         (A  ),
-    .write_data_i   (WD),
+    .write_data_i   (WD ),
-    .read_data_o    (RD)
+    .read_data_o    (RD )
     );
     
     logic [31:0] RDa;
-    
     integer i, err_count = 0;
-    
     assign A = i;
     
     parameter CLK_FREQ_MHz   = 100;
@@ -57,7 +56,7 @@ parameter TIME_OPERATION  = 50;
         $display( "\nStart test: \n\n==========================\nCLICK THE BUTTON 'Run All'\n==========================\n"); $stop();
         REQ = 1;
         WE = 0;
-        i = 1; #10;
+        i = 0; #10;
         if (RD !== 32'hx) begin
             $display("The data memory should not be initialized by the $readmemh function");
             err_count = err_count + 1;
@@ -67,8 +66,8 @@ parameter TIME_OPERATION  = 50;
             WE = 1;
             WD = $urandom;
         end
-        for (i = 0; i < (ADDR_SIZE+1); i = i + 1) begin
+        for (i = 0; i < (ADDR_SIZE+STEP); i = i + 1 + $urandom() % STEP) begin
-            if (i != (ADDR_SIZE+1)) begin
+            if (i < (ADDR_SIZE)) begin
                 REQ = |($urandom %10);
                 WE = 0;
                 #TIME_OPERATION;
@@ -87,10 +86,11 @@ parameter TIME_OPERATION  = 50;
                 end
             end
             else begin
+                WE = 0;
                 REQ = 1;
                 #TIME_OPERATION;
                 if (RD !== 32'd3735928559) begin
-                    $display("When reading (write_enable_i = %h) at an address greater than 4095, it should return dead_beef yor data: %h_%h, time: %t", WE, RD[31:16],RD[15:0], $time);
+                    $display("When reading (write_enable_i = %h) at an address greater than 16383 (addr = %d), it should return dead_beef your data: %h_%h, time: %t", WE, A, RD[31:16],RD[15:0], $time);
                     err_count = err_count + 1;
                 end
             end
@@ -98,31 +98,29 @@ parameter TIME_OPERATION  = 50;
         end
         #TIME_OPERATION;
         REQ = 1;
-        WE = 1;
-        #TIME_OPERATION;
-        for (i = 0; i < 8; i = i + 4) begin 
-            WD = i? 32'hfecd_ba98: 32'h7654_3210;
-            #TIME_OPERATION;
-        end
         WE = 0;
-        i = 2;
         #TIME_OPERATION;
-        if (RD !== 32'hba98_7654) begin
+        for (i = 0; i < 4; i = i + 1) begin 
-            $display("data is being written to the cell incorrectly. RAM [0:7] must be 0x0123456789abcdef, time: %t", $time);
+          if(i==0) begin 
+            repeat(2)@(posedge CLK); 
+            RDa = RD;
+          end else
+          if(RD !== RDa) begin
+            $display("incorrect conversion of the reading address = %h, time: %t", A, $time);
             err_count = err_count + 1;
+          end
+          #TIME_OPERATION;
         end
-        @(posedge CLK)
+        i = 0; WE = 0; REQ = 1;
-        i = 0; 
+        @(posedge CLK);
         @(negedge CLK);
-        if (RD !== 32'hba98_7654) begin
+        i = 4;
+        #1; RDa = RD;
+        @(posedge CLK); #1;
+        if (RD == RDa) begin
             $display("reading from data memory must be synchronous, time: %t", $time);
             err_count = err_count + 1;
         end
-        @(posedge CLK); #5;
-        if (RD !== 32'h7654_3210) begin
-            $display("synchronous data memory read error, time: %t", $time);
-            err_count = err_count + 1;
-        end
         $display("Number of errors: %d", err_count);
         if( !err_count )  $display("\ndata_mem SUCCESS!!!\n");
         $finish();