gc_sync_word_wr.vhd: add comments.

46ab11f4 · Tristan Gingold · 7580f64b · 46ab11f4
Commit 46ab11f4 authored May 07, 2019 by Tristan Gingold
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gc_sync_word_wr.vhd modules/common/gc_sync_word_wr.vhd +4 -0

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--- a/modules/common/gc_sync_word_wr.vhd
+++ b/modules/common/gc_sync_word_wr.vhd
@@ -80,6 +80,7 @@ begin
            --  Toggle start_wr ...
            start_wr <= not start_wr;
            in_busy <= '1';
+            --  Save the data.
            data <= data_i;
          end if;
        else
@@ -98,6 +99,9 @@ begin
    end if;
  end process;

+  --  Synchronize the pulse.
+  --  The data are not synchronized because they will be read once the pulse
+  --  has gone the the out clock domain.
  cmp_wr_sync : entity work.gc_sync_ffs
    port map (
      clk_i => clk_out_i,