.ngc "black box"
synthesized with generic parameters set as:
		MII_SEL: std_logic := '1';   
			-- select which MII interface: 0 = RGMII, 1 = GMII/MII
		PHY_ADDR: std_logic_vector(4 downto 0) := "00100";	
			-- PHY_AD0/1 pulled-down by 1KOhm, PHY_AD2 pulled-up in .ucf file.
		CLK_FREQUENCY: integer := 120
			-- CLK frequency in MHz. Needed to compute actual delays.



These are rev7.
Need to synthesize with newer rev8. todo.
