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7-4 MPC860T (Rev. D) Fast Ethernet Controller Supplement MOTOROLA
PRELIMINARYÑSUBJECT TO CHANGE WITHOUT NOTICE
7.3.4 MII Serial Management Channel Timing (MDIO,MDC)
Table 7-4 provides information on the MII serial management channel signal timing, shown
in Figure 7-4. The FEC functions correctly with a maximum MDC frequency in excess of
2.5 MHz. The exact upper bound is under investigation.
Figure 7-4 shows the MII serial management channel timing diagram.
Figure 7-4. MII Serial Management Channel Timing Diagram
Table 7-4. MII Serial Management Channel Timing
Num Characteristic
Min
(ns)
Max
(ns)
Unit
M10 MDC falling edge to MDIO output invalid (minimum
propagation delay)
0Ñns
M11 MDC falling edge to MDIO output valid (max prop delay) Ñ 25
M12 MDIO (input) to MDC rising edge setup 10 Ñ ns
M13 MDIO (input) to MDC rising edge hold 0 Ñ
M14 MDC pulse width high 40% 60% MDC period
M15 MDC pulse width low 40% 60% MDC period
M11
MDC (output)
MDIO (output)
M12
M13
MDIO (input)
M10
M14
MM15
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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