[Cryptech-Commits] [core/math/modexpng] 87/92: Improved debugging options: * flush console after each ladder iteration for smoother progress output * ability to truncate internal powering ladder loop at desired step (this will only work when using simulation mode, obviously)

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paul at psgd.org pushed a commit to branch master
in repository core/math/modexpng.

commit f2598e0ec96852ced07cff5a6baa91b0ff1dc00f
Author: Pavel V. Shatov (Meister) <meisterpaul1 at yandex.ru>
AuthorDate: Mon Feb 3 22:43:48 2020 +0300

    Improved debugging options:
     * flush console after each ladder iteration for smoother progress output
     * ability to truncate internal powering ladder loop at desired step (this will
       only work when using simulation mode, obviously)
---
 rtl/modexpng_io_manager.v        | 21 +++++++++++++++++++--
 rtl/modexpng_io_manager_debug.vh |  2 ++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/rtl/modexpng_io_manager.v b/rtl/modexpng_io_manager.v
index fdbc4af..2b71779 100644
--- a/rtl/modexpng_io_manager.v
+++ b/rtl/modexpng_io_manager.v
@@ -345,6 +345,14 @@ module modexpng_io_manager
     //
     // Ladder Init/Step Logic
     //
+
+`ifdef MODEXPNG_ENABLE_DEBUG
+//`define DEFINE_MODEXPNG_TRUNCATE_LADDER XXX /*specify step index to abort ladder*/
+`ifdef DEFINE_MODEXPNG_TRUNCATE_LADDER
+localparam [BIT_INDEX_W-1:0] MODEXPNG_TRUNCATE_LADDER = `DEFINE_MODEXPNG_TRUNCATE_LADDER;
+`endif
+`endif
+
     reg ladder_d_r;
     reg ladder_p_r;
     reg ladder_q_r;
@@ -360,8 +368,8 @@ module modexpng_io_manager
     wire [  OP_ADDR_W -1:0] ladder_index_msb = ladder_index[BIT_INDEX_W-1-: OP_ADDR_W];
     wire [ WORD_MUX_W -1:0] ladder_index_lsb = ladder_index[ WORD_MUX_W-1-:WORD_MUX_W];
     wire                    ladder_index_is_zero = ladder_index == BIT_INDEX_ZERO; 
-    
-    always @(posedge clk)
+        
+    always @(posedge clk) begin
         //
         if (io_fsm_state_next == IO_FSM_STATE_LATENCY_PRE1) begin
             //
@@ -378,6 +386,15 @@ module modexpng_io_manager
             end
             //
         end
+        //
+`ifdef MODEXPNG_ENABLE_DEBUG
+`ifdef DEFINE_MODEXPNG_TRUNCATE_LADDER
+        if ((io_fsm_state_next == IO_FSM_STATE_STOP) && opcode_is_ladder_step && (ladder_index == MODEXPNG_TRUNCATE_LADDER)) 
+            ladder_done_r <= 1'b1;
+`endif
+`endif
+        //
+    end
 
 
     //
diff --git a/rtl/modexpng_io_manager_debug.vh b/rtl/modexpng_io_manager_debug.vh
index e94ec67..3d50cc6 100644
--- a/rtl/modexpng_io_manager_debug.vh
+++ b/rtl/modexpng_io_manager_debug.vh
@@ -36,6 +36,8 @@ always @(posedge clk)
         if (opcode_is_ladder_init) begin
             $display("[step] | D | P | Q");
             $display("-------+---+---+---");
+            $fflush;
         end else if (opcode_is_ladder_step)
             $display("[%4d] | %d | %d | %d", ladder_index, ladder_d_r, ladder_p_r, ladder_q_r);
+            $fflush;
     end