Microcontroller User's Manual

MOTOROLA Chapter 33. Electrical Characteristics 33-23
Fast Ethernet AC Timing Specifications
33.12.4 MII Serial Management Channel Timing
(EMDIO and EMDC)
The FEC functions correctly with a maximum MDC frequency of 2.5 MHz.
Table 33-20 lists MII serial management channel timings.
Figure 33-13 shows MII serial management channel timings listed in Table 33-20.
Figure 33-13. MII Serial Management Channel Timing Diagram
Table 33-20. MII Serial Management Channel Timing
Num Characteristic Min Max Unit
M10 EMDC falling edge to EMDIO output invalid (minimum propagation
delay)
0— ns
M11 EMDC falling edge to EMDIO output valid (max prop delay) — 25 ns
M12 EMDIO (input) to EMDC rising edge setup 10 — ns
M13 EMDIO (input) to EMDC rising edge hold 0 — ns
M14 EMDC pulse width high 40% 60% MDC period
M15 EMDC pulse width low 40% 60% MDC period
M11
EMDC (output)
EMDIO (output)
M12
M13
EMDIO (input)
M10
M14
M15