MPC8308 datasheet(15/88 Pages) FREESCALE

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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

7.2

DUART AC Electrical Specifications

Table 20 provides the AC timing parameters for the DUART interface.

Ethernet: Three-Speed Ethernet, MII Management

This section provides the AC and DC electrical characteristics for three-speed, 10/100/1000, and MII

management. MPC8308 supports dual Ethernet controllers.

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.”

Low-level output voltage, IOL = 100 μAVOL

—0.2

Input current (0 V

≤VIN ≤ NVDD)IIN

—± 5

μA

Table 20. DUART AC Timing Specifications

Parameter

Value

Unit

Notes

Minimum baud rate

256

baud

—

Maximum baud rate

> 1,000,000

baud

Oversample rate

—

Notes:

1. Actual attainable baud rate is limited by the latency of interrupt processing.

2. The middle of a start bit is detected as the 8th sampled 0 after the 1-to-0 transition of the start bit.

Subsequent bit values are sampled each 16th sample.

Table 19. DUART DC Electrical Characteristics (continued)

Parameter

Symbol

Min

Max

Unit

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