MPC8308 datasheet(20/88 Pages) FREESCALE

20 / 88 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

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 RGMII are specified in Section 8.1, “Enhanced Three-Speed Ethernet Controller (eTSEC)

(10/100/1000 Mbps)—MII/RGMII Electrical Characteristics.”

8.3.1

MII Management DC Electrical Characteristics

The MDC and MDIO are defined to operate at a supply voltage of 3.3 V. Table 26 provides the DC

electrical characteristics for MDIO and MDC.

8.3.2

MII Management AC Electrical Specifications

Table 27 provides the MII management AC timing specifications.

Table 26. MII Management DC Electrical Characteristics When Powered at 3.3 V

Parameter

Symbol

Conditions

Min

Max

Unit

Supply voltage (3.3 V)

NVDD

—3.0

3.6

Output high voltage

VOH

IOH = –1.0 mA

NVDD = Min

2.10

NVDD +0.3

Output low voltage

VOL

IOL = 1.0 mA

LVDD = Min

VSS

0.50

Input high voltage

VIH

—2.0

—

Input low voltage

VIL

——

0.80

Input high current

IIH

NVDD = Max

VIN

1 = 2.1 V

—

μA

Input low current

IIL

NVDD = Max

VIN = 0.5 V

–600

—

μA

Note:

1. Note that the symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.

Table 27. MII Management AC Timing Specifications

At recommended operating conditions with LVDDA/LVDDB is 3.3 V ± 0.3V

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

Notes

MDC frequency

fMDC

—2.5

—

MHz

MDC period

tMDC

—

400

—

MDC clock pulse width high

tMDCH

—

MDC to MDIO delay

tMDKHDX

—

170

MDIO to MDC setup time

tMDDVKH

5—

—

MDIO to MDC hold time

tMDDXKH

0—

—

MDC rise time

tMDCR

—

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