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IXF1104 4-Port Gigabit Ethernet Media Access Controller
145 Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
7.6 MDIO 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.)
7.6.1 MDC High-Speed Operation Timing
7.6.2 MDC Low-Speed Operation Timing
Figure 41. MDC High-Speed Operation Timing
Figure 42. MDC Low-Speed Operation Timing
24 ns
(3 X 125 MHz clocks)
32 ns
(4 X 125 MHz clocks)
MDC
56 ns (17.85 MHz)
200 ns
(25 X 125 MHz clocks)
200 ns
(25 X 125 MHz clocks)
MDC
400 ns (2.5 MHz)