MPC8309EC datasheet(28/82 Pages) FREESCALE

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0

Freescale Semiconductor

Ethernet and MII Management

Figure 16 shows the RMII receive AC timing diagram.

Figure 16. RMII Receive AC Timing Diagram

8.3

Ethernet Management Interface Electrical Characteristics

The electrical characteristics specified here apply to MII management interface signals MDIO

(management data input/output) and MDC (management data clock). The electrical characteristics for

MII, and RMII are specified in Section 8.1, “Ethernet Controller (10/100 Mbps)—MII/RMII Electrical

Characteristics.”

8.3.1

MII Management DC Electrical Characteristics

MDC and MDIO are defined to operate at a supply voltage of 3.3 V. The DC electrical characteristics for

MDIO and MDC are provided in Table 24.

8.3.2

MII Management AC Electrical Specifications

Table 25 provides the MII management AC timing specifications.

Table 24. MII Management DC Electrical Characteristics When Powered at 3.3 V

Parameter

Symbol

Conditions

Min

Max

Unit

Supply voltage (3.3 V)

OVDD

—3

3.6

Output high voltage

VOH

IOH = –1.0 mA

OVDD =Min

2.40

OVDD + 0.3

Output low voltage

VOL

IOL = 1.0 mA

OVDD = Min

GND

0.50

Input high voltage

VIH

—2.00

—

Input low voltage

VIL

—

0.80

Input current

IIN

0 V

 V

IN  OVDD

—±5

A

Table 25. MII Management AC Timing Specifications

At recommended operating conditions with OVDD is 3.3 V ± 300mV.

Parameter/Condition

Symbol1

Min

Typical

Max

Unit

Notes

MDC frequency

fMDC

—2.5

—

MHz

—

MDC period

tMDC

—400

—

MDC clock pulse width high

tMDCH

—

REF_CLK

RXD[1:0]

tRMRDXKH

tRMX

tRMXH

tRMXR

tRMXF

CRS_DV

RX_ER

tRMRDVKH

Valid Data

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