MPC8308 datasheet(16/90 Pages) FREESCALE

16 / 90 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

8.1

Enhanced Three-Speed Ethernet Controller (eTSEC)

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

The electrical characteristics specified here apply to all the media independent interface (MII) and reduced

gigabit media independent interface (RGMII), signals except management data input/output (MDIO) and

management data clock (MDC). The RGMII interface is defined for 2.5 V, while the MII interface can be

operated at 3.3 V. The RGMII interface follows the Hewlett-Packard reduced pin-count interface for

Gigabit Ethernet Physical Layer Device Specification Version 1.2a (9/22/2000). The electrical

characteristics for MDIO and MDC are specified in Section 8.3, “Ethernet Management Interface

Electrical Characteristics.”

8.1.1

eTSEC DC Electrical Characteristics

All MII and RGMII drivers and receivers comply with the DC parametric attributes specified in Table 21

and Table 22. The RGMII signals are based on a 2.5-V CMOS interface voltage as defined by JEDEC

EIA/JESD8-5.

Table 21. MII DC Electrical Characteristics

Parameter

Symbol

Conditions

Min

Max

Unit

Supply voltage 3.3 V

LVDD

—3.0

3.6

Output high voltage

VOH

IOH = –4.0 mA

LVDD = Min

2.40

LVDD + 0.3

Output low voltage

VOL

IOL = 4.0 mA

LVDD= Min

VSS

0.50

Input high voltage

VIH

——

2.1

LVDD + 0.3

Input low voltage

VIL

—

–0.3

0.90

Input high current

IIH

VIN

1 = LV

—40

μA

Input low current

IIL

VIN

1 = VSS

–600

—

μA

Note:

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

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