MPC8378E datasheet(22/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

7.2

DUART AC Electrical Specifications

Table 22 provides the AC timing parameters for the DUART interface of the device.

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

This section provides the AC and DC electrical characteristics for the enhanced three-speed Ethernet

controller.

8.1

SGMII Interface Electrical Characteristics

Each SGMII port features a 4-wire AC-coupled serial link from the dedicated SerDes1 interface of the

MPC8378E as shown in Figure 7, where CTX is the external (on board) AC-coupled capacitor. Each output

pin of the SerDes transmitter differential pair features 50-

Ω output impedance. Each input of the SerDes

receiver differential pair features 50-

Ω on-die termination to SGND_SRDSn (xcorevss). The reference

circuit of the SerDes transmitter and receiver is shown in Figure 65.

When an eTSEC port is configured to operate in SGMII mode, the parallel interface’s output signals of

this eTSEC port can be left floating. Also, when operating in SGMII mode, the eTSEC EC_GTX_CLK125

High-level output voltage,

IOH = –100 μA

VOH

OVDD – 0.2

—

Low-level output voltage,

IOL = 100 μA

VOL

—0.2

Input current,

(0 V

≤VIN ≤ OVDD)

IIN

—±30

μA

Note:

• The symbol VIN, in this case, represents the OVIN symbol referenced in Table 2.

Table 22. 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 will be 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 21. DUART DC Electrical Characteristics (continued)

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