MPC8548EEC datasheet(41/151 Pages) NXP

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 10

Freescale Semiconductor

Ethernet Management Interface Electrical Characteristics

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

GMII, RGMII, RMII, TBI, and RTBI are specified in “Section 8, “Enhanced Three-Speed Ethernet

(eTSEC).”

9.1

MII Management DC Electrical Characteristics

The 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 this table.

9.2

MII Management AC Electrical Specifications

This table provides the MII management AC timing specifications.

Table 36. MII Management DC Electrical Characteristics

Parameter

Symbol

Min

Max

Unit

Supply voltage (3.3 V)

OVDD

3.13

3.47

Output high voltage (OVDD = Min, IOH = –1.0 mA)

VOH

2.10

OVDD + 0.3

Output low voltage (OVDD =Min, IOL = 1.0 mA)

VOL

GND

0.50

Input high voltage

VIH

2.0

—

Input low voltage

VIL

—0.90

Input high current (OVDD = Max, VIN1 = 2.1 V)

IIH

—40

μA

Input low current (OVDD = Max, VIN = 0.5 V)

IIL

–600

—

μA

Note:

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

Table 37. MII Management AC Timing Specifications

At recommended operating conditions with OVDD is 3.3 V ± 5%.

Parameter

Symbol1

Min

Typ

Max

Unit

Notes

MDC frequency

fMDC

0.72

2.5

8.3

MHz

2, 3, 4

MDC period

tMDC

120.5

—

1389

—

MDC clock pulse width high

tMDCH

—

MDC to MDIO valid

tMDKHDV

× tCCB

——

MDC to MDIO delay

tMDKHDX

(16 × tCCB× 8) – 3

—

(16 × tCCB × 8) + 3

MDIO to MDC setup time

tMDDVKH

5—

—

MDIO to MDC hold time

tMDDXKH

0—

—

MDC rise time

tMDCR

—

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