Motorola MCF5282 MII Async Inputs Signal Timing Ecrs and Ecol, MII Transmit Signal Timing

Fast Ethernet AC Timing Specifications

Table 33-18lists MII transmit channel timings.

Table 33-18. MII Transmit Signal Timing

Num	Characteristic1	Min	Max	Unit
M5	ETXCLK to ETXD[3:0], ETXEN, ETXER invalid	5	—	ns
M6	ETXCLK to ETXD[3:0], ETXEN, ETXER valid	—	25	ns
M7	ETXCLK pulse width high	35%	65%	ETXCLK period
M8	ETXCLK pulse width low	35%	65%	ETXCLK period

1ETXCLK, ETXD0, and ETXEN have the same timing in 10 Mbit 7-wire interface mode.

Figure 33-11shows MII transmit signal timings listed in Table 33-18.

	M7
ETXCLK (input)
	M5
ETXD[3:0] (outputs)	M8
ETXEN
ETXER
	M6

Figure 33-11. MII Transmit Signal Timing Diagram

33.12.3 MII Async Inputs Signal Timing (ECRS and ECOL)

Table 33-19lists MII asynchronous inputs signal timing.

Table 33-19. MII Async Inputs Signal Timing

Num	Characteristic	Min	Max	Unit
M91	ECRS, ECOL minimum pulse width	1.5	—	ETXCLK period

1ECOL has the same timing in 10 Mbit 7-wire interface mode.

Figure 33-12shows MII asynchronous input timings listed in Table 33-19.

ECRS, ECOL

M9

Figure 33-12. MII Async Inputs Timing Diagram

33-22 MCF5282 User’s Manual MOTOROLA