Non functional cleanups: (1) Changed name of round counter to show what is used for. (2) Fixed timescale and empty parentheses of tasks in testbenches. (3) Fixed targets in Makefile to build if needed.

3 files changed, 48 insertions, 56 deletions

diff --git a/src/rtl/sha512_core.v b/src/rtl/sha512_core.v
index 9454f40..01f124d 100644
--- a/src/rtl/sha512_core.v
+++ b/src/rtl/sha512_core.v
@@ -126,11 +126,11 @@ module sha512_core(
   reg [63 : 0] H7_new;
   reg          H_we;
 
-  reg [6 : 0] t_ctr_reg;
-  reg [6 : 0] t_ctr_new;
-  reg         t_ctr_we;
-  reg         t_ctr_inc;
-  reg         t_ctr_rst;
+  reg [6 : 0] round_ctr_reg;
+  reg [6 : 0] round_ctr_new;
+  reg         round_ctr_we;
+  reg         round_ctr_inc;
+  reg         round_ctr_rst;
 
   reg [31 : 0] work_factor_ctr_reg;
   reg [31 : 0] work_factor_ctr_new;
@@ -147,6 +147,7 @@ module sha512_core(
   reg [1 : 0] sha512_ctrl_new;
   reg         sha512_ctrl_we;
 
+  reg [63 : 0] t1_reg;
 
   //----------------------------------------------------------------
   // Wires.
@@ -184,7 +185,7 @@ module sha512_core(
   // Module instantiantions.
   //----------------------------------------------------------------
   sha512_k_constants k_constants_inst(
-                                      .addr(t_ctr_reg),
+                                      .addr(round_ctr_reg),
                                       .K(k_data)
                                      );
 
@@ -254,11 +255,14 @@ module sha512_core(
           H7_reg              <= 64'h0000000000000000;
           work_factor_ctr_reg <= 32'h00000000;
           digest_valid_reg    <= 0;
-          t_ctr_reg           <= 7'h00;
+          round_ctr_reg       <= 7'h0;
           sha512_ctrl_reg     <= CTRL_IDLE;
+          t1_reg              <= 64'h0;
         end
       else
         begin
+          t1_reg <= t1;
+
           if (a_h_we)
             begin
               a_reg <= a_new;
@@ -331,9 +335,9 @@ module sha512_core(
           if (state15_we)
             H7_reg <= {H7_reg[63 : 32], state_wr_data};
 
-          if (t_ctr_we)
+          if (round_ctr_we)
             begin
-              t_ctr_reg <= t_ctr_new;
+              round_ctr_reg <= round_ctr_new;
             end
 
           if (work_factor_ctr_we)
@@ -501,28 +505,28 @@ module sha512_core(
 
 
   //----------------------------------------------------------------
-  // t_ctr
+  // round_ctr
   //
   // Update logic for the round counter, a monotonically
   // increasing counter with reset.
   //----------------------------------------------------------------
   always @*
-    begin : t_ctr
-      t_ctr_new = 7'h00;
-      t_ctr_we  = 0;
+    begin : round_ctr
+      round_ctr_new = 7'h0;
+      round_ctr_we  = 0;
 
-      if (t_ctr_rst)
+      if (round_ctr_rst)
         begin
-          t_ctr_new = 7'h00;
-          t_ctr_we  = 1;
+          round_ctr_new = 7'h00;
+          round_ctr_we  = 1;
         end
 
-      if (t_ctr_inc)
+      if (round_ctr_inc)
         begin
-          t_ctr_new = t_ctr_reg + 1'b1;
-          t_ctr_we  = 1;
+          round_ctr_new = round_ctr_reg + 1'b1;
+          round_ctr_we  = 1;
         end
-    end // t_ctr
+    end // round_ctr
 
 
   //----------------------------------------------------------------
@@ -567,7 +571,6 @@ module sha512_core(
 
       state_init          = 0;
       state_update        = 0;
-      t1_we               = 0;
 
       first_block         = 0;
       ready_flag          = 0;
@@ -575,8 +578,8 @@ module sha512_core(
       w_init              = 0;
       w_next              = 0;
 
-      t_ctr_inc           = 0;
-      t_ctr_rst           = 0;
+      round_ctr_inc       = 0;
+      round_ctr_rst       = 0;
 
       digest_valid_new    = 0;
       digest_valid_we     = 0;
@@ -600,7 +603,7 @@ module sha512_core(
                 w_init              = 1;
                 state_init          = 1;
                 first_block         = 1;
-                t_ctr_rst           = 1;
+                round_ctr_rst       = 1;
                 digest_valid_new    = 0;
                 digest_valid_we     = 1;
                 sha512_ctrl_new     = CTRL_ROUNDS1;
@@ -612,7 +615,7 @@ module sha512_core(
                 work_factor_ctr_rst = 1;
                 w_init              = 1;
                 state_init          = 1;
-                t_ctr_rst           = 1;
+                round_ctr_rst       = 1;
                 digest_valid_new    = 0;
                 digest_valid_we     = 1;
                 sha512_ctrl_new     = CTRL_ROUNDS1;
@@ -623,7 +626,6 @@ module sha512_core(
 
         CTRL_ROUNDS1:
           begin
-            t1_we           = 1;
             sha512_ctrl_new = CTRL_ROUNDS2;
             sha512_ctrl_we  = 1;
           end
@@ -631,11 +633,11 @@ module sha512_core(
 
         CTRL_ROUNDS2:
           begin
-            w_next       = 1;
-            state_update = 1;
-            t_ctr_inc    = 1;
+            w_next        = 1;
+            state_update  = 1;
+            round_ctr_inc = 1;
 
-            if (t_ctr_reg == SHA512_ROUNDS)
+            if (round_ctr_reg == SHA512_ROUNDS)
               begin
                 work_factor_ctr_inc = 1;
                 sha512_ctrl_new     = CTRL_DONE;
@@ -651,7 +653,7 @@ module sha512_core(
                   begin
                     w_init              = 1;
                     state_init          = 1;
-                    t_ctr_rst           = 1;
+                    round_ctr_rst       = 1;
                     sha512_ctrl_new     = CTRL_ROUNDS1;
                     sha512_ctrl_we      = 1;
                   end
diff --git a/src/tb/tb_sha512.v b/src/tb/tb_sha512.v
index a0dcb4c..8bc0068 100644
--- a/src/tb/tb_sha512.v
+++ b/src/tb/tb_sha512.v
@@ -37,11 +37,6 @@
 //
 //======================================================================
 
-//------------------------------------------------------------------
-// Simulator directives.
-//------------------------------------------------------------------
-`timescale 1ns/10ps
-
 
 //------------------------------------------------------------------
 // Test module.
@@ -202,7 +197,7 @@ module tb_sha512();
   //
   // Dump the state of the dump when needed.
   //----------------------------------------------------------------
-  task dump_dut_state();
+  task dump_dut_state;
     begin
       $display("State of DUT");
       $display("------------");
@@ -257,7 +252,7 @@ module tb_sha512();
   //
   // Toggles reset to force the DUT into a well defined state.
   //----------------------------------------------------------------
-  task reset_dut();
+  task reset_dut;
     begin
       $display("*** Toggle reset.");
       tb_reset_n = 0;
@@ -275,7 +270,7 @@ module tb_sha512();
   // Initialize all counters and testbed functionality as well
   // as setting the DUT inputs to defined values.
   //----------------------------------------------------------------
-  task init_sim();
+  task init_sim;
     begin
       cycle_ctr = 32'h00000000;
       error_ctr = 32'h00000000;
@@ -296,7 +291,7 @@ module tb_sha512();
   //
   // Display the accumulated test results.
   //----------------------------------------------------------------
-  task display_test_result();
+  task display_test_result;
     begin
       if (error_ctr == 0)
         begin
@@ -321,7 +316,7 @@ module tb_sha512();
   // when the dut is actively processing and will in fact at some
   // point set the flag.
   //----------------------------------------------------------------
-  task wait_ready();
+  task wait_ready;
     begin
       read_data = 0;
 
@@ -431,7 +426,7 @@ module tb_sha512();
   //
   // Read the name and version from the DUT.
   //----------------------------------------------------------------
-  task check_name_version();
+  task check_name_version;
     reg [31 : 0] name0;
     reg [31 : 0] name1;
     reg [31 : 0] version;
@@ -459,7 +454,7 @@ module tb_sha512();
   // Read the digest in the dut. The resulting digest will be
   // available in the global variable digest_data.
   //----------------------------------------------------------------
-  task read_digest();
+  task read_digest;
     begin
       read_word(ADDR_DIGEST0);
       digest_data[511 : 480] = read_data;
diff --git a/src/tb/tb_sha512_core.v b/src/tb/tb_sha512_core.v
index b8523a0..8aeaa33 100644
--- a/src/tb/tb_sha512_core.v
+++ b/src/tb/tb_sha512_core.v
@@ -37,11 +37,6 @@
 //
 //======================================================================
 
-//------------------------------------------------------------------
-// Simulator directives.
-//------------------------------------------------------------------
-`timescale 1ns/10ps
-
 
 //------------------------------------------------------------------
 // Test module.
@@ -134,7 +129,7 @@ module tb_sha512_core();
   //
   // Dump the state of the dut.
   //----------------------------------------------------------------
-  task dump_dut_state();
+  task dump_dut_state;
     begin
       $display("State of DUT");
       $display("------------");
@@ -160,8 +155,8 @@ module tb_sha512_core();
                dut.state_init, dut.state_update);
       $display("first_block     = 0x%01x, ready_flag    = 0x%01x, w_init    = 0x%01x",
                dut.first_block, dut.ready_flag, dut.w_init);
-      $display("t_ctr_inc       = 0x%01x, t_ctr_rst     = 0x%01x, t_ctr_reg = 0x%02x",
-               dut.t_ctr_inc, dut.t_ctr_rst, dut.t_ctr_reg);
+      $display("round_ctr_inc       = 0x%01x, round_ctr_rst     = 0x%01x, round_ctr_reg = 0x%02x",
+               dut.round_ctr_inc, dut.round_ctr_rst, dut.round_ctr_reg);
       $display("");
 
       $display("State registers:");
@@ -189,7 +184,7 @@ module tb_sha512_core();
   //
   // Dump the state of the dut wmem.
   //----------------------------------------------------------------
-  task dump_dut_wmem();
+  task dump_dut_wmem;
     begin
       $display("State of DUT WMEM");
       $display("-----------------");
@@ -215,7 +210,7 @@ module tb_sha512_core();
   //
   // Toggle reset to put the DUT into a well known state.
   //----------------------------------------------------------------
-  task reset_dut();
+  task reset_dut;
     begin
       $display("*** Toggle reset.");
       tb_reset_n = 0;
@@ -231,7 +226,7 @@ module tb_sha512_core();
   // Initialize all counters and testbed functionality as well
   // as setting the DUT inputs to defined values.
   //----------------------------------------------------------------
-  task init_sim();
+  task init_sim;
     begin
       cycle_ctr = 0;
       error_ctr = 0;
@@ -254,7 +249,7 @@ module tb_sha512_core();
   //
   // Display the accumulated test results.
   //----------------------------------------------------------------
-  task display_test_result();
+  task display_test_result;
     begin
       if (error_ctr == 0)
         begin
@@ -277,7 +272,7 @@ module tb_sha512_core();
   // when the dut is actively processing and will in fact at some
   // point set the flag.
   //----------------------------------------------------------------
-  task wait_ready();
+  task wait_ready;
     begin
       while (!tb_ready)
         begin