diff --git a/rtl/eth/taxi_eth_mac_10g.f b/rtl/eth/taxi_eth_mac_10g.f
index 7781129..22db3e5 100644
--- a/rtl/eth/taxi_eth_mac_10g.f
+++ b/rtl/eth/taxi_eth_mac_10g.f
@@ -9,3 +9,4 @@ taxi_mac_pause_ctrl_tx.sv
 taxi_mac_pause_ctrl_rx.sv
 ../lfsr/taxi_lfsr.sv
 ../axis/taxi_axis_if.sv
+../sync/taxi_sync_signal.sv
diff --git a/rtl/eth/taxi_eth_mac_10g.sv b/rtl/eth/taxi_eth_mac_10g.sv
index 778b476..dac583b 100644
--- a/rtl/eth/taxi_eth_mac_10g.sv
+++ b/rtl/eth/taxi_eth_mac_10g.sv
@@ -370,56 +370,36 @@ if (MAC_CTRL_EN) begin : mac_ctrl
     wire [MCF_PARAMS_SIZE*8-1:0]  rx_mcf_params;
 
     // terminate LFC pause requests from RX internally on TX side
-    wire                          tx_pause_req_int;
-    wire                          rx_lfc_ack_int;
+    wire tx_pause_req_int;
+    wire rx_lfc_ack_int;
 
-    reg tx_lfc_req_sync_reg_1 = 1'b0;
-    reg tx_lfc_req_sync_reg_2 = 1'b0;
-    reg tx_lfc_req_sync_reg_3 = 1'b0;
+    wire rx_lfc_req_sync;
 
-    always @(posedge rx_clk or posedge rx_rst) begin
-        if (rx_rst) begin
-            tx_lfc_req_sync_reg_1 <= 1'b0;
-        end else begin
-            tx_lfc_req_sync_reg_1 <= rx_lfc_req;
-        end
-    end
+    taxi_sync_signal #(
+        .WIDTH(1),
+        .N(2)
+    )
+    rx_lfc_req_sync_inst (
+        .clk(tx_clk),
+        .in(rx_lfc_req),
+        .out(rx_lfc_req_sync)
+    );
 
-    always @(posedge tx_clk or posedge tx_rst) begin
-        if (tx_rst) begin
-            tx_lfc_req_sync_reg_2 <= 1'b0;
-            tx_lfc_req_sync_reg_3 <= 1'b0;
-        end else begin
-            tx_lfc_req_sync_reg_2 <= tx_lfc_req_sync_reg_1;
-            tx_lfc_req_sync_reg_3 <= tx_lfc_req_sync_reg_2;
-        end
-    end
+    wire tx_pause_ack_sync;
 
-    reg rx_lfc_ack_sync_reg_1 = 1'b0;
-    reg rx_lfc_ack_sync_reg_2 = 1'b0;
-    reg rx_lfc_ack_sync_reg_3 = 1'b0;
+    taxi_sync_signal #(
+        .WIDTH(1),
+        .N(2)
+    )
+    tx_pause_ack_sync_inst (
+        .clk(rx_clk),
+        .in(tx_lfc_pause_en && tx_pause_ack),
+        .out(tx_pause_ack_sync)
+    );
 
-    always @(posedge tx_clk or posedge tx_rst) begin
-        if (tx_rst) begin
-            rx_lfc_ack_sync_reg_1 <= 1'b0;
-        end else begin
-            rx_lfc_ack_sync_reg_1 <= tx_lfc_pause_en ? tx_pause_ack : 0;
-        end
-    end
+    assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en && rx_lfc_req_sync);
 
-    always @(posedge rx_clk or posedge rx_rst) begin
-        if (rx_rst) begin
-            rx_lfc_ack_sync_reg_2 <= 1'b0;
-            rx_lfc_ack_sync_reg_3 <= 1'b0;
-        end else begin
-            rx_lfc_ack_sync_reg_2 <= rx_lfc_ack_sync_reg_1;
-            rx_lfc_ack_sync_reg_3 <= rx_lfc_ack_sync_reg_2;
-        end
-    end
-
-    assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en ? tx_lfc_req_sync_reg_3 : 0);
-
-    assign rx_lfc_ack_int = rx_lfc_ack || rx_lfc_ack_sync_reg_3;
+    assign rx_lfc_ack_int = rx_lfc_ack || tx_pause_ack_sync;
 
     taxi_mac_ctrl_tx #(
         .ID_W(s_axis_tx.ID_W),
diff --git a/rtl/eth/taxi_eth_mac_1g.f b/rtl/eth/taxi_eth_mac_1g.f
index 6898df9..227b60e 100644
--- a/rtl/eth/taxi_eth_mac_1g.f
+++ b/rtl/eth/taxi_eth_mac_1g.f
@@ -7,3 +7,4 @@ taxi_mac_pause_ctrl_tx.sv
 taxi_mac_pause_ctrl_rx.sv
 ../lfsr/taxi_lfsr.sv
 ../axis/taxi_axis_if.sv
+../sync/taxi_sync_signal.sv
diff --git a/rtl/eth/taxi_eth_mac_1g.sv b/rtl/eth/taxi_eth_mac_1g.sv
index 8e3d61f..8c949ba 100644
--- a/rtl/eth/taxi_eth_mac_1g.sv
+++ b/rtl/eth/taxi_eth_mac_1g.sv
@@ -283,56 +283,36 @@ if (MAC_CTRL_EN) begin : mac_ctrl
     wire [MCF_PARAMS_SIZE*8-1:0]  rx_mcf_params;
 
     // terminate LFC pause requests from RX internally on TX side
-    wire                          tx_pause_req_int;
-    wire                          rx_lfc_ack_int;
+    wire tx_pause_req_int;
+    wire rx_lfc_ack_int;
 
-    reg tx_lfc_req_sync_reg_1 = 1'b0;
-    reg tx_lfc_req_sync_reg_2 = 1'b0;
-    reg tx_lfc_req_sync_reg_3 = 1'b0;
+    wire rx_lfc_req_sync;
 
-    always @(posedge rx_clk or posedge rx_rst) begin
-        if (rx_rst) begin
-            tx_lfc_req_sync_reg_1 <= 1'b0;
-        end else begin
-            tx_lfc_req_sync_reg_1 <= rx_lfc_req;
-        end
-    end
+    taxi_sync_signal #(
+        .WIDTH(1),
+        .N(2)
+    )
+    rx_lfc_req_sync_inst (
+        .clk(tx_clk),
+        .in(rx_lfc_req),
+        .out(rx_lfc_req_sync)
+    );
 
-    always @(posedge tx_clk or posedge tx_rst) begin
-        if (tx_rst) begin
-            tx_lfc_req_sync_reg_2 <= 1'b0;
-            tx_lfc_req_sync_reg_3 <= 1'b0;
-        end else begin
-            tx_lfc_req_sync_reg_2 <= tx_lfc_req_sync_reg_1;
-            tx_lfc_req_sync_reg_3 <= tx_lfc_req_sync_reg_2;
-        end
-    end
+    wire tx_pause_ack_sync;
 
-    reg rx_lfc_ack_sync_reg_1 = 1'b0;
-    reg rx_lfc_ack_sync_reg_2 = 1'b0;
-    reg rx_lfc_ack_sync_reg_3 = 1'b0;
+    taxi_sync_signal #(
+        .WIDTH(1),
+        .N(2)
+    )
+    tx_pause_ack_sync_inst (
+        .clk(rx_clk),
+        .in(tx_lfc_pause_en && tx_pause_ack),
+        .out(tx_pause_ack_sync)
+    );
 
-    always @(posedge tx_clk or posedge tx_rst) begin
-        if (tx_rst) begin
-            rx_lfc_ack_sync_reg_1 <= 1'b0;
-        end else begin
-            rx_lfc_ack_sync_reg_1 <= tx_lfc_pause_en ? tx_pause_ack : 0;
-        end
-    end
+    assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en && rx_lfc_req_sync);
 
-    always @(posedge rx_clk or posedge rx_rst) begin
-        if (rx_rst) begin
-            rx_lfc_ack_sync_reg_2 <= 1'b0;
-            rx_lfc_ack_sync_reg_3 <= 1'b0;
-        end else begin
-            rx_lfc_ack_sync_reg_2 <= rx_lfc_ack_sync_reg_1;
-            rx_lfc_ack_sync_reg_3 <= rx_lfc_ack_sync_reg_2;
-        end
-    end
-
-    assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en ? tx_lfc_req_sync_reg_3 : 0);
-
-    assign rx_lfc_ack_int = rx_lfc_ack || rx_lfc_ack_sync_reg_3;
+    assign rx_lfc_ack_int = rx_lfc_ack || tx_pause_ack_sync;
 
     taxi_mac_ctrl_tx #(
         .ID_W(s_axis_tx.ID_W),
diff --git a/rtl/eth/taxi_eth_mac_phy_10g.f b/rtl/eth/taxi_eth_mac_phy_10g.f
index 36ef62f..ca1bc5b 100644
--- a/rtl/eth/taxi_eth_mac_phy_10g.f
+++ b/rtl/eth/taxi_eth_mac_phy_10g.f
@@ -5,3 +5,4 @@ taxi_mac_ctrl_tx.sv
 taxi_mac_ctrl_rx.sv
 taxi_mac_pause_ctrl_tx.sv
 taxi_mac_pause_ctrl_rx.sv
+../sync/taxi_sync_signal.sv
diff --git a/rtl/eth/taxi_eth_mac_phy_10g.sv b/rtl/eth/taxi_eth_mac_phy_10g.sv
index f116ecd..348596e 100644
--- a/rtl/eth/taxi_eth_mac_phy_10g.sv
+++ b/rtl/eth/taxi_eth_mac_phy_10g.sv
@@ -305,56 +305,36 @@ if (MAC_CTRL_EN) begin : mac_ctrl
     wire [MCF_PARAMS_SIZE*8-1:0]  rx_mcf_params;
 
     // terminate LFC pause requests from RX internally on TX side
-    wire                          tx_pause_req_int;
-    wire                          rx_lfc_ack_int;
+    wire tx_pause_req_int;
+    wire rx_lfc_ack_int;
 
-    reg tx_lfc_req_sync_reg_1 = 1'b0;
-    reg tx_lfc_req_sync_reg_2 = 1'b0;
-    reg tx_lfc_req_sync_reg_3 = 1'b0;
+    wire rx_lfc_req_sync;
 
-    always @(posedge rx_clk or posedge rx_rst) begin
-        if (rx_rst) begin
-            tx_lfc_req_sync_reg_1 <= 1'b0;
-        end else begin
-            tx_lfc_req_sync_reg_1 <= rx_lfc_req;
-        end
-    end
+    taxi_sync_signal #(
+        .WIDTH(1),
+        .N(2)
+    )
+    rx_lfc_req_sync_inst (
+        .clk(tx_clk),
+        .in(rx_lfc_req),
+        .out(rx_lfc_req_sync)
+    );
 
-    always @(posedge tx_clk or posedge tx_rst) begin
-        if (tx_rst) begin
-            tx_lfc_req_sync_reg_2 <= 1'b0;
-            tx_lfc_req_sync_reg_3 <= 1'b0;
-        end else begin
-            tx_lfc_req_sync_reg_2 <= tx_lfc_req_sync_reg_1;
-            tx_lfc_req_sync_reg_3 <= tx_lfc_req_sync_reg_2;
-        end
-    end
+    wire tx_pause_ack_sync;
 
-    reg rx_lfc_ack_sync_reg_1 = 1'b0;
-    reg rx_lfc_ack_sync_reg_2 = 1'b0;
-    reg rx_lfc_ack_sync_reg_3 = 1'b0;
+    taxi_sync_signal #(
+        .WIDTH(1),
+        .N(2)
+    )
+    tx_pause_ack_sync_inst (
+        .clk(rx_clk),
+        .in(tx_lfc_pause_en && tx_pause_ack),
+        .out(tx_pause_ack_sync)
+    );
 
-    always @(posedge tx_clk or posedge tx_rst) begin
-        if (tx_rst) begin
-            rx_lfc_ack_sync_reg_1 <= 1'b0;
-        end else begin
-            rx_lfc_ack_sync_reg_1 <= tx_lfc_pause_en ? tx_pause_ack : 0;
-        end
-    end
+    assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en && rx_lfc_req_sync);
 
-    always @(posedge rx_clk or posedge rx_rst) begin
-        if (rx_rst) begin
-            rx_lfc_ack_sync_reg_2 <= 1'b0;
-            rx_lfc_ack_sync_reg_3 <= 1'b0;
-        end else begin
-            rx_lfc_ack_sync_reg_2 <= rx_lfc_ack_sync_reg_1;
-            rx_lfc_ack_sync_reg_3 <= rx_lfc_ack_sync_reg_2;
-        end
-    end
-
-    assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en ? tx_lfc_req_sync_reg_3 : 0);
-
-    assign rx_lfc_ack_int = rx_lfc_ack || rx_lfc_ack_sync_reg_3;
+    assign rx_lfc_ack_int = rx_lfc_ack || tx_pause_ack_sync;
 
     taxi_mac_ctrl_tx #(
         .ID_W(s_axis_tx.ID_W),
diff --git a/syn/vivado/taxi_eth_mac.tcl b/syn/vivado/taxi_eth_mac.tcl
deleted file mode 100644
index fa3894d..0000000
--- a/syn/vivado/taxi_eth_mac.tcl
+++ /dev/null
@@ -1,38 +0,0 @@
-# SPDX-License-Identifier: CERN-OHL-S-2.0
-#
-# Copyright (c) 2019-2025 FPGA Ninja, LLC
-#
-# Authors:
-# - Alex Forencich
-#
-
-# Ethernet MAC timing constraints
-
-foreach inst [get_cells -hier -regexp -filter {(ORIG_REF_NAME =~ "taxi_eth_mac_(1g|10g)(__\w+__\d+)?" ||
-        REF_NAME =~ "taxi_eth_mac_(1g|10g)(__\w+__\d+)?")}] {
-    puts "Inserting timing constraints for Ethernet MAC instance $inst"
-
-    set sync_ffs [get_cells -quiet -hier -regexp ".*/mac_ctrl.tx_lfc_req_sync_reg_\[1234\]_reg" -filter "PARENT == $inst"]
-
-    if {[llength $sync_ffs]} {
-        set_property ASYNC_REG TRUE $sync_ffs
-
-        set src_clk [get_clocks -of_objects [get_pins $inst/mac_ctrl.tx_lfc_req_sync_reg_1_reg/C]]
-
-        set src_clk_period [if {[llength $src_clk]} {get_property -min PERIOD $src_clk} {expr 1.0}]
-
-        set_max_delay -from [get_cells $inst/mac_ctrl.tx_lfc_req_sync_reg_1_reg] -to [get_cells $inst/mac_ctrl.tx_lfc_req_sync_reg_2_reg] -datapath_only $src_clk_period
-    }
-
-    set sync_ffs [get_cells -quiet -hier -regexp ".*/mac_ctrl.rx_lfc_ack_sync_reg_\[1234\]_reg" -filter "PARENT == $inst"]
-
-    if {[llength $sync_ffs]} {
-        set_property ASYNC_REG TRUE $sync_ffs
-
-        set src_clk [get_clocks -of_objects [get_pins $inst/mac_ctrl.rx_lfc_ack_sync_reg_1_reg/C]]
-
-        set src_clk_period [if {[llength $src_clk]} {get_property -min PERIOD $src_clk} {expr 1.0}]
-
-        set_max_delay -from [get_cells $inst/mac_ctrl.rx_lfc_ack_sync_reg_1_reg] -to [get_cells $inst/mac_ctrl.rx_lfc_ack_sync_reg_2_reg] -datapath_only $src_clk_period
-    }
-}