diff --git a/lib/emac/emac_jb.vhd b/lib/emac/emac_jb.vhd
index b689075..5477c33 100644
--- a/lib/emac/emac_jb.vhd
+++ b/lib/emac/emac_jb.vhd
@@ -4,6 +4,10 @@ USE IEEE.NUMERIC_STD.ALL;
 use std.textio.all; --  Imports the standard textio package.
 
 ENTITY emac_jb IS
+	Generic
+	(
+		f_sysclk	: real	:= 100.0
+	);
 	Port
 	(
 		CLK_I		: in  STD_LOGIC;