diff --git a/lib/emac/src/emac_top_jb.vhd b/lib/emac/src/emac_top_jb.vhd
index 332b591..cf7c2ec 100644
--- a/lib/emac/src/emac_top_jb.vhd
+++ b/lib/emac/src/emac_top_jb.vhd
@@ -110,8 +110,8 @@ registers_write:
 				tx_ctrl_in.tx_size		<= (others => '0');
 				rx_ctrl_in.mac_addr		<= (X"03", X"02", X"01", X"00", X"07", X"06");
 				rx_ctrl_in.promiscious	<= '0';
-				tx_ctrl_in.Gbps_en		<= '1';
-				rx_ctrl_in.Gbps_en		<= '1';
+				tx_ctrl_in.Gbps_en		<= '0';
+				rx_ctrl_in.Gbps_en		<= '0';
 				tx_ctrl_in.fcs_gen_en	<= '0';
 				rx_ctrl_in.fcs_chk_en	<= '0';
 			elsif reg_write = '1' then