ATO2-55: Added Fullness Status Signal to FIFO and passed it out as status signal

hdl/src/fifo_vr.sv

@@ -30,7 +30,10 @@ module fifo_vr #(
     output logic [DATA_W-1:0] data_out,
     output logic data_out_last,
     input  logic data_out_ready,
-    output logic data_out_valid
+    output logic data_out_valid,
+
+    // Status 
+    output logic [PTR_W-1:0] status_ptr_dif
 );
 
     logic data_in_shake;    // Successful Write Handshake
@@ -46,6 +49,8 @@ module fifo_vr #(
     
     assign ptr_dif = write_ptr - read_ptr;
     
+    assign status_ptr_dif = ptr_dif;
+    
     // EXAMPLE: Conditions to write and read from FIFO's
     // Write Ptr  | Read Ptr  | Ptr_Dif | Valid Write | Valid Read
     //    000     -    000    =   000   |      Y      |     N

hdl/src/sha256_id_buf.sv

@@ -10,7 +10,11 @@
 //-----------------------------------------------------------------------------
 `include "fifo_vr.sv"
 
-module sha256_id_buf (
+module sha256_id_buf #(
+    parameter DEPTH = 4,
+    parameter ID_DATA_W = 6,
+    parameter PTR_W = $clog2(DEPTH)  // Read/Write Pointer Width
+)(
     input logic clk,
     input logic nrst,
     input logic en,
@@ -19,23 +23,25 @@ module sha256_id_buf (
     input logic sync_rst,
     
     // ID In
-    input  logic [5:0] id_in,
+    input  logic [ID_DATA_W-1:0] id_in,
     input  logic id_in_last,
     input  logic id_in_valid,
     output logic id_in_ready,
 
     // ID Out
-    output logic [5:0] id_out,
+    output logic [ID_DATA_W-1:0] id_out,
     output logic id_out_last,
     output logic id_out_valid,
     input  logic id_out_ready,
 
     // Status Out
-    output logic [5:0] status_id
+    output logic [ID_DATA_W-1:0] status_id,       // ID being passed to Validator
+    output logic [PTR_W:0] status_buffered_ids    // Number of IDs in ID Validation Queue
 );
     
-    fifo_vr #(8, // Depth
-              6  // Data Width 
+    logic [PTR_W:0] status_ptr_dif;
+    fifo_vr #( DEPTH,     // Depth
+               ID_DATA_W  // Data Width 
     ) id_buffer (
         .clk (clk),
         .nrst (nrst),
@@ -48,10 +54,12 @@ module sha256_id_buf (
         .data_out (id_out),
         .data_out_last (id_out_last),
         .data_out_valid (id_out_valid),
-        .data_out_ready (id_out_ready)
+        .data_out_ready (id_out_ready),
+        .status_ptr_dif (status_ptr_dif)
     );
 
     // Status Signal Logic
     // - status ID is updated when id_out is updated
+    assign status_buffered_ids = status_ptr_dif;
     assign status_id = id_out;
 endmodule
\ No newline at end of file

hdl/verif/tb_sha256_id_buf.sv

@@ -217,7 +217,7 @@ module tb_sha256_id_buf;
         
         // Read output data into Queue
         fd = $fopen("../stimulus/testbench/output_buf_id_ref.csv", "r");
-        while ($fscanf (fd, "%x,%b,%b,%d", temp_id_out, temp_id_out_last, temp_status_id_out, temp_id_out_stall) == 4) begin
+        while ($fscanf (fd, "%d,%b,%d,%d", temp_id_out, temp_id_out_last, temp_status_id_out, temp_id_out_stall) == 4) begin
             id_out_queue.push_back(temp_id_out);
             id_out_last_queue.push_back(temp_id_out_last);
             status_id_out_queue.push_back(temp_status_id_out);