Freescale Semiconductor POWERPC MPC860T - Manual (Page 64)

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) 0 Ñ ns
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
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