[Cryptech-Commits] [core/hash/sha512] branch clock_speed updated: Added reg on output from w_mem to split long path. Adjusted when w_next is set to update w_mem to account for delay cycle.

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joachim at secworks.se pushed a commit to branch clock_speed
in repository core/hash/sha512.

The following commit(s) were added to refs/heads/clock_speed by this push:
     new 4ebdf3e  Added reg on output from w_mem to split long path. Adjusted when w_next is set to update w_mem to account for delay cycle.
4ebdf3e is described below

commit 4ebdf3e80842e38906d85badbbaf25435aa85677
Author: Joachim Strömbergson <joachim at secworks.se>
AuthorDate: Tue Dec 4 13:20:17 2018 +0100

    Added reg on output from w_mem to split long path. Adjusted when w_next is set to update w_mem to account for delay cycle.
---
 src/rtl/sha512_core.v  | 15 +++++++--------
 src/rtl/sha512_w_mem.v | 32 +++++++++++++-------------------
 2 files changed, 20 insertions(+), 27 deletions(-)

diff --git a/src/rtl/sha512_core.v b/src/rtl/sha512_core.v
index 407f84c..6f6f821 100644
--- a/src/rtl/sha512_core.v
+++ b/src/rtl/sha512_core.v
@@ -79,12 +79,11 @@ module sha512_core(
   //----------------------------------------------------------------
   // Internal constant and parameter definitions.
   //----------------------------------------------------------------
-  parameter SHA512_ROUNDS = 79;
-
-  parameter CTRL_IDLE    = 0;
-  parameter CTRL_T1_T2   = 1;
-  parameter CTRL_ROUNDS  = 2;
-  parameter CTRL_DONE    = 3;
+  localparam SHA512_ROUNDS = 79;
+  localparam CTRL_IDLE    = 0;
+  localparam CTRL_T1_T2   = 1;
+  localparam CTRL_ROUNDS  = 2;
+  localparam CTRL_DONE    = 3;
 
 
   //----------------------------------------------------------------
@@ -634,7 +633,8 @@ module sha512_core(
 
         CTRL_T1_T2:
           begin
-            t1_t2_we        = 1;
+            t1_t2_we      = 1;
+            w_next        = 1;
             sha512_ctrl_new = CTRL_ROUNDS;
             sha512_ctrl_we  = 1;
           end
@@ -642,7 +642,6 @@ module sha512_core(
 
         CTRL_ROUNDS:
           begin
-            w_next        = 1;
             state_update  = 1;
             round_ctr_inc = 1;
 
diff --git a/src/rtl/sha512_w_mem.v b/src/rtl/sha512_w_mem.v
index e0a6775..4aadb50 100644
--- a/src/rtl/sha512_w_mem.v
+++ b/src/rtl/sha512_w_mem.v
@@ -83,12 +83,14 @@ module sha512_w_mem(
   reg [6 : 0] w_ctr_new;
   reg         w_ctr_we;
 
+  reg [63 : 0] w_reg;
+  reg [63 : 0] w_new;
+
 
   //----------------------------------------------------------------
   // Wires.
   //----------------------------------------------------------------
   reg [63 : 0] w_tmp;
-  reg [63 : 0] w_new;
 
 
   //----------------------------------------------------------------
@@ -105,28 +107,20 @@ module sha512_w_mem(
   //----------------------------------------------------------------
   always @ (posedge clk or negedge reset_n)
     begin : reg_update
+      integer i;
+
       if (!reset_n)
         begin
-          w_mem[00]             <= 64'h0;
-          w_mem[01]             <= 64'h0;
-          w_mem[02]             <= 64'h0;
-          w_mem[03]             <= 64'h0;
-          w_mem[04]             <= 64'h0;
-          w_mem[05]             <= 64'h0;
-          w_mem[06]             <= 64'h0;
-          w_mem[07]             <= 64'h0;
-          w_mem[08]             <= 64'h0;
-          w_mem[09]             <= 64'h0;
-          w_mem[10]             <= 64'h0;
-          w_mem[11]             <= 64'h0;
-          w_mem[12]             <= 64'h0;
-          w_mem[13]             <= 64'h0;
-          w_mem[14]             <= 64'h0;
-          w_mem[15]             <= 64'h0;
-          w_ctr_reg             <= 7'h00;
+          for (i = 0 ; i < 16 ; i = i + 1)
+            w_mem[i] <= 64'h0;
+
+          w_ctr_reg <= 7'h0;
+          w_reg <= 64'h0;
         end
       else
         begin
+          w_reg <= w_new;
+
           if (w_mem_we)
             begin
               w_mem[00] <= w_mem00_new;
@@ -169,7 +163,7 @@ module sha512_w_mem(
         end
       else
         begin
-          w_tmp = w_new;
+          w_tmp = w_reg;
         end
     end // select_w
 

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