Motorola ColdFire MCF5281 - Manual (Page 706)

Electrical Characteristics
33-22 Freescale Semiconductor
Figure 33-11 shows MII receive signal timings listed in Table 33-21 .
Figure 33-11. MII Receive Signal Timing Diagram
33.13.2 MII Transmit Signal Timing (ETXD[3:0], ETXEN, ETXER, ETXCLK)
The transmitter functions correctly up to a ETXCLK maximum frequency of 25 MHz +1%. In addition,
the processor clock frequency must exceed twice the ETXCLK frequency.
Table 33-22 lists MII transmit channel timings.
Figure 33-12 shows MII transmit signal timings listed in Table 33-22 .
Table 33-21. MII Receive Signal Timing
Num Characteristic
1
1 ERXDV, ERXCLK, and ERXD[0] have same timing in 10 Mbps 7-wire interface mode.
Min Max Unit
M1 ERXD[3:0], ERXDV, ERXER to ERXCLK setup 5 — ns
M2 ERXCLK to ERXD[3:0], ERXDV, ERXER hold 5 — ns
M3 ERXCLK pulse width high 35% 65% ERXCLK period
M4 ERXCLK pulse width low 35% 65% ERXCLK period
Table 33-22. 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
M1 M2
ERXCLK (input)
ERXD[3:0] (inputs)
ERXDV
ERXER
M3
M4
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3