fix: txts_o and rxtx_o in clk_ref domain instead of clk_sy domain.

fe9d4661 · Peter Jansweijer · 4e39ff0f · fe9d4661
Commit fe9d4661 authored Mar 04, 2020 by Peter Jansweijer
Hide whitespace changes
Inline Side-by-side

Showing with 24 additions and 2 deletions

ep_timestamping_unit.vhd modules/wr_endpoint/ep_timestamping_unit.vhd +24 -2

No files found.
--- a/modules/wr_endpoint/ep_timestamping_unit.vhd
+++ b/modules/wr_endpoint/ep_timestamping_unit.vhd
@@ -371,6 +371,18 @@ begin  -- syn
      npulse_o => tx_ts_done,
      ppulse_o => open);

+  -- timestamping "txts_o" is same as "done" signal above, but in clk_ref domain
+  txts_gen : gc_sync_ffs
+    generic map (
+      g_sync_edge => "positive")
+    port map (
+      clk_i    => clk_ref_i,
+      rst_n_i  => rst_n_ref_i,
+      data_i   => tx_sync_delay(0),
+      synced_o => open,
+      npulse_o => txts_o,
+      ppulse_o => open);
+
  -- timestamping "done" signals sync chains (clk_rx -> clk_sys)
  rx_done_gen : gc_sync_ffs
    generic map (
@@ -383,8 +395,18 @@ begin  -- syn
      npulse_o => rx_ts_done,
      ppulse_o => open);

-  txts_o <= tx_ts_done; 		-- 2013-Nov-28 peterj added for debugging/calibration
-  rxts_o <= rx_ts_done; 		-- 2013-Nov-28 peterj added for debugging/calibration
+  -- timestamping "rxts_o" is same as "done" signal above, but in clk_ref domain
+  rxts_gen : gc_sync_ffs
+    generic map (
+      g_sync_edge => "positive")
+    port map (
+      clk_i    => clk_ref_i,
+      rst_n_i  => rst_n_ref_i,
+      data_i   => rx_sync_delay(0),
+      synced_o => open,
+      npulse_o => rxts_o,
+      ppulse_o => open);
+

  p_output_rx_ts : process (clk_rx_i)
  begin