From 900de3c8776e46756952710b1e38260cb4a810b3 Mon Sep 17 00:00:00 2001
From: Eric Kooistra <kooistra@astron.nl>
Date: Wed, 5 Oct 2022 10:04:36 +0200
Subject: [PATCH] Register ref_sync to ease timing closure for ref_sync fanout
to (many) dp_bsn_monitor_v2 instances.
---
libraries/base/dp/src/vhdl/dp_bsn_monitor_v2.vhd | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/libraries/base/dp/src/vhdl/dp_bsn_monitor_v2.vhd b/libraries/base/dp/src/vhdl/dp_bsn_monitor_v2.vhd
index ead0038c65..8670721cbb 100644
--- a/libraries/base/dp/src/vhdl/dp_bsn_monitor_v2.vhd
+++ b/libraries/base/dp/src/vhdl/dp_bsn_monitor_v2.vhd
@@ -116,6 +116,7 @@ ARCHITECTURE rtl OF dp_bsn_monitor_v2 IS
SIGNAL nof_valid : STD_LOGIC_VECTOR(c_cnt_valid_w-1 DOWNTO 0);
SIGNAL cnt_latency : STD_LOGIC_VECTOR(c_cnt_latency_w-1 DOWNTO 0);
SIGNAL latency : STD_LOGIC_VECTOR(c_cnt_latency_w-1 DOWNTO 0);
+ SIGNAL ref_sync_reg : STD_LOGIC := '0';
SIGNAL i_mon_ready_stable : STD_LOGIC;
SIGNAL i_mon_xon_stable : STD_LOGIC;
@@ -167,7 +168,10 @@ BEGIN
nof_err <= cnt_err;
nof_valid <= cnt_valid;
latency <= cnt_latency;
-
+
+ -- Register ref_sync to ease timing closure for ref_sync fanout to (many) dp_bsn_monitor_v2 instances
+ ref_sync_reg <= ref_sync WHEN rising_edge(clk);
+
u_sync_timeout_cnt : ENTITY common_lib.common_counter
GENERIC MAP (
g_width => c_sync_timeout_w
@@ -315,7 +319,7 @@ BEGIN
load => TO_SVEC(1, c_cnt_valid_w),
count => cnt_valid
);
-
+
u_cnt_latency : ENTITY common_lib.common_counter
GENERIC MAP (
g_width => c_cnt_latency_w
@@ -323,7 +327,7 @@ BEGIN
PORT MAP (
rst => rst,
clk => clk,
- cnt_clr => ref_sync,
+ cnt_clr => ref_sync_reg,
cnt_en => '1',
count => cnt_latency
);
--
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