AW_ready_valid_handshake

sim_1/imports/sim_1/tb_axi4_Lite_MM.v

@@ -96,6 +96,9 @@ module tb_axi4_Lite_MM;
            s_axi_wdata  = 32'h11_44_33_22;
            s_axi_wvalid = 1;
            s_axi_bready = 1;
+           #8
+           s_axi_awvalid = 0;               // added on 23022021.
+           s_axi_wvalid = 0;    
            #8;
            //s_axi_awaddr = 18'h04;
            //s_axi_wdata  = 32'haa_bb_cc_ff;
@@ -114,6 +117,9 @@ module tb_axi4_Lite_MM;
            s_axi_wdata  = 32'h88_77_66_55;  //66_55_77_88;
            s_axi_wvalid = 1;
            //s_axi_bready = 1;
+            #12
+           s_axi_awvalid = 0;               // added on 23022021.
+           s_axi_wvalid = 0;  
           
           #12
           s_axi_araddr = 18'h10;  

sources_1/imports/AXI4_liteMM/adderss_gen1.v

@@ -38,19 +38,19 @@ wire [17:0] addr_out;
 
 always @ (posedge core_clk)
     begin
-        if (!rst_n)
+        if (!(rst_n && en_cnt))      // addded on 23022021.
                 cnt <= 2'b00;
         else if (en_cnt)
                 begin
                     cnt <= cnt + 1'b1;
                 end
         else 
-            begin
-               if (cnt != 2'b00)        // addded on 22022021.
-                    cnt <= 2'b00;       // addded on 22022021.
-               else                     // addded on 22022021.
+//            begin
+//               if (cnt != 2'b00)        // addded on 22022021.
+//                    cnt <= 2'b00;       // addded on 22022021.
+//               else                     // addded on 22022021.
                     cnt <= cnt;   
-            end
+            //end
           
     
     end

sources_1/imports/AXI4_liteMM/axi4_lite_v1_0_S_AXI_1.sv

@@ -152,16 +152,26 @@
 	    end 
 	  else
 	    begin    
-	      if (~axi_awready && S_AXI_AWVALID && S_AXI_WVALID)
+	      if (~axi_awready && S_AXI_AWVALID && S_AXI_WVALID) //&&(~wadr_dne))
 	        begin
 	          // slave is ready to accept write address when 
 	          // there is a valid write address and write data
 	          // on the write address and data bus. This design 
-	          // expects no outstanding transactions. 
+	          // expects no outstanding transactions.
 	          axi_awready <= 1'b1;
+	          
+	        if (!wadr_dne)                // adde for control of AWready.232022021.
+	               axi_awready <= 1'b0;
+	          else 
+	               axi_awready <= 1'b1;
+	          
 	        end
 	      else           
 	        begin
+	      /*   if (!wadr_dne)                // adde for control of AWready.232022021.
+	               axi_awready <= 1'b0;
+	          else 
+	               axi_awready <= 1'b1;*/
 	          axi_awready <= 1'b0;
 	        end
 	    end 
@@ -200,7 +210,7 @@
 	    end 
 	  else
 	    begin    
-	      if (~axi_wready && S_AXI_WVALID && S_AXI_AWVALID)
+	      if (~axi_wready && S_AXI_WVALID && S_AXI_AWVALID) // &&(wadr_dne))
 	        begin
 	          // slave is ready to accept write data when 
 	          // there is a valid write address and write data
@@ -222,7 +232,7 @@
 	// These registers are cleared when reset (active low) is applied.
 	// Slave register write enable is asserted when valid address and data are available
 	// and the slave is ready to accept the write address and write data.
-	assign slv_reg_wren = axi_wready && S_AXI_WVALID && axi_awready && S_AXI_AWVALID;	// Slave Register Write Enable
+	assign slv_reg_wren = axi_wready && S_AXI_WVALID && axi_awready && S_AXI_AWVALID ; //&& (wadr_dne) ;	// Slave Register Write Enable
 
 	always @( posedge S_AXI_ACLK )
 	begin
@@ -244,7 +254,7 @@
                         // Slave register 0
                         slv_reg0[byte_index] <= S_AXI_WDATA[(byte_index*8) +: 8];
                         
-                        if(byte_index <= 3) //= 4)
+                        if(byte_index <= 3) //= 4)            not need when checked with slv_reg_wren. 23022021.
                             s_data_done <= 1'b0; //1'b1;
                         else
                             s_data_done <= 1'b1; //1'b0;
@@ -431,7 +441,7 @@
         
     //Enable_gen READ_ADDR_EN(.clk(S_AXI_ACLK),.rst(radr_dne),.en_in(slv_reg_rden),.en_out(read_en));
     Enable_gen READ_ADDR_EN(.clk(S_AXI_ACLK),.sys_rst_n(S_AXI_ARESETN),.stop(radr_dne),.en_in(slv_reg_rden),.en_out(read_en));
-    Enable_gen WRITE_ADDR_EN(.clk(S_AXI_ACLK),.sys_rst_n(S_AXI_ARESETN),.stop(wadr_dne),.en_in(s_data_done),.en_out(write_en));
+    Enable_gen WRITE_ADDR_EN(.clk(S_AXI_ACLK),.sys_rst_n(S_AXI_ARESETN),.stop(wadr_dne),.en_in(s_data_done),.en_out(write_en)); //.en_in(slv_reg_wren),.en_out(write_en)); 
         
         
     always_comb