Monitor tx_fifo_rd_emp as OUT port.

libraries/io/eth/src/vhdl/eth_tester.vhd

@@ -53,6 +53,8 @@ ENTITY eth_tester IS
     ip_src_addr        : IN  STD_LOGIC_VECTOR(c_network_ip_addr_w-1 DOWNTO 0);
     udp_src_port       : IN  STD_LOGIC_VECTOR(c_network_udp_port_w-1 DOWNTO 0);
 
+    tx_fifo_rd_emp_arr : OUT STD_LOGIC_VECTOR(g_nof_streams-1 DOWNTO 0);
+
     tx_udp_sosi_arr    : OUT t_dp_sosi_arr(g_nof_streams-1 DOWNTO 0);
     tx_udp_siso_arr    : IN  t_dp_siso_arr(g_nof_streams-1 DOWNTO 0) := (OTHERS=> c_dp_siso_rdy);
 
@@ -119,6 +121,8 @@ BEGIN
       ip_src_addr        => ip_src_addr,
       udp_src_port       => udp_src_port,
 
+      tx_fifo_rd_emp     => tx_fifo_rd_emp_arr(I),
+
       tx_udp_sosi        => tx_udp_sosi_arr(I),
       tx_udp_siso        => tx_udp_siso_arr(I),