MPC8308 datasheet(15/90 Pages) FREESCALE

15 / 90 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2

Freescale Semiconductor

DUART

Figure 7 provides the AC test load for the DDR2 bus.

Figure 7. DDR2 AC Test Load

7DUART

This section describes the DC and AC electrical specifications for the DUART interface.

7.1

DUART DC Electrical Characteristics

Table 19 provides the DC electrical characteristics for the DUART interface.

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.

Table 19. DUART DC Electrical Characteristics

Parameter

Symbol

Min

Max

Unit

High-level input voltage

VIH

2.1

NVDD + 0.3

Low-level input voltage NVDD

VIL

–0.3

0.8

High-level output voltage, IOH = –100 μAVOH

NVDD – 0.2

—

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.

Output

Z0 = 50 Ω

RL = 50 Ω

GVDD/2

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