Motorola ColdFire MCF5281 - Manual (Page 707)

Electrical Characteristics
Freescale Semiconductor 33-23
Figure 33-12. MII Transmit Signal Timing Diagram
33.13.3 MII Async Inputs Signal Timing (ECRS and ECOL)
Table 33-23 lists MII asynchronous inputs signal timing.
Figure 33-13 shows MII asynchronous input timings listed in Table 33-23 .
Figure 33-13. MII Async Inputs Timing Diagram
33.13.4 MII Serial Management Channel Timing (EMDIO and EMDC)
The FEC functions correctly with a maximum MDC frequency of 2.5 MHz. Table 33-24 lists MII serial
management channel timings.
Figure 33-14 shows MII serial management channel timings listed in Table 33-24 .
Table 33-23. 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
Table 33-24. 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
M6
ETXCLK (input)
ETXD[3:0] (outputs)
ETXEN
ETXER
M5
M7
M8
ECRS, ECOL
M9
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3