MPC8572EVTARLB 参数 Datasheet PDF下载

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

7.2

DUART AC Electrical Specifications

Table 21. DUART AC Timing Specifications

Table 21

provides the AC timing parameters for the DUART interface.

DD

of 3.3V ± 5%.

Parameter

Minimum baud rate

Maximum baud rate

Oversample rate

Value

f

CCB

/1,048,576

f

CCB

/16

16

Unit

baud

baud

—

Notes

1, 2

1, 2, 3

1, 4

Notes:

1. Guaranteed by design

2. f

CCB

refers to the internal platform clock frequency.

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

4. The middle of a start bit is detected as the 8

th

sampled 0 after the 1-to-0 transition of the start bit. Subsequent bit values are

sampled each 16

th

sample.

8

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

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

controller.

8.1

Enhanced Three-Speed Ethernet Controller (eTSEC)

(10/100/1000 Mbps)—FIFO/GMII/MII/TBI/RGMII/RTBI/RMII

Electrical Characteristics

The electrical characteristics specified here apply to all FIFO mode, gigabit media independent interface

(GMII), media independent interface (MII), ten-bit interface (TBI), reduced gigabit media independent

interface (RGMII), reduced ten-bit interface (RTBI), and reduced media independent interface (RMII)

signals except management data input/output (MDIO) and management data clock (MDC), and serial

gigabit media independent interface (SGMII). The RGMII, RTBI and FIFO mode interfaces are defined

for 2.5 V, while the GMII, MII, RMII, and TBI interfaces can operate at both 2.5V and 3.3V.

The GMII, MII, or TBI interface timing is compliant with IEEE 802.3. The RGMII and RTBI interfaces

follow the Reduced Gigabit Media-Independent Interface (RGMII) Specification Version 1.3

(12/10/2000). The RMII interface follows the RMII Consortium RMII Specification Version 1.2

(3/20/1998).

The electrical characteristics for MDIO and MDC are specified in

Section 9, “Ethernet Management

Interface Electrical Characteristics.”

Section 8.3, “SGMII Interface Electrical

Characteristics.”

The SGMII interface conforms (with exceptions) to the Serial-GMII Specification

Version 1.8.

MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4

28

Freescale Semiconductor