Motorola MCF5281, MCF5282 user manual MII Serial Management Channel Timing Emdio and Emdc

Fast Ethernet AC Timing Specifications

33.12.4MII Serial Management Channel Timing (EMDIO and EMDC)

The FEC functions correctly with a maximum MDC frequency of 2.5 MHz. Table 33-20lists MII serial management channel timings.

Table 33-20. MII Serial Management Channel Timing

Num	Characteristic	Min	Max	Unit
M10	EMDC falling edge to EMDIO output invalid (minimum propagation	0	—	ns
	delay)
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

Figure 33-13shows MII serial management channel timings listed in Table 33-20.

EMDC (output)

EMDIO (output)

EMDIO (input)

	M14
	M15
	M10
	M11
M12	M13

Figure 33-13. MII Serial Management Channel Timing Diagram

MOTOROLA Chapter 33. Electrical Characteristics 33-23