Intel IXF1104 manual Mdio AC Timing Specification, MDC High-Speed Operation Timing

Intel® IXF1104 4-Port Gigabit Ethernet Media Access Controller

7.6MDIO AC Timing Specification

The MDIO Interface on the IXF1104 MAC can operate in two modes – low-speed and high-speed. In low-speed mode, the MDC clock signal operates at a frequency of 2.5 MHz. In high-speed mode, the MDC clock signal operates at a frequency of 18 MHz. (See Figure 41 through Figure 44 and Table 52.)

7.6.1MDC High-Speed Operation Timing

Figure 41. MDC High-Speed Operation Timing

24 ns	32 ns
(3 X 125 MHz clocks)	(4 X 125 MHz clocks)
MDC
	56 ns (17.85 MHz)

7.6.2MDC Low-Speed Operation Timing

Figure 42. MDC Low-Speed Operation Timing

200 ns	200 ns
(25 X 125 MHz clocks) (25 X 125 MHz clocks)
MDC
	400 ns (2.5 MHz)

145 Datasheet

Document Number: 278757

Revision Number: 009

Revision Date: 27-Oct-2005