Motorola MCF5281 用户手册
33-22
MCF5282 User’s Manual
MOTOROLA
Fast Ethernet AC Timing Specifications
Table 33-18 lists MII transmit channel timings.
Figure 33-11. MII Transmit Signal Timing Diagram
33.12.3 MII Async Inputs Signal Timing (ECRS and ECOL)
Table 33-19 lists MII asynchronous inputs signal timing.
Figure 33-12. MII Async Inputs Timing Diagram
Table 33-18. MII Transmit Signal Timing
Num
Characteristic
1
1
ETXCLK, ETXD0, and ETXEN have the same timing in 10 Mbit 7-wire interface mode.
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
Table 33-19. MII Async Inputs Signal Timing
Num
Characteristic
Min
Max
Unit
M9
1
1
ECOL has the same timing in 10 Mbit 7-wire interface mode.
ECRS, ECOL minimum pulse width
1.5
—
ETXCLK period
M6
ETXCLK (input)
ETXD[3:0] (outputs)
ETXEN
ETXER
M5
M7
M8
ECRS, ECOL
M9