MPC8548E datasheet(37/144 Pages) FREESCALE

tên linh kiện	MPC8548E

Giải thích chi tiết về linh kiện	PowerQUICC??III Integrated Processor Hardware Specifications

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MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC)

Figure 17 shows the RGMII and RTBI AC timing and multiplexing diagrams.

Figure 17. RGMII and RTBI AC Timing and Multiplexing Diagrams

8.2.7

RMII AC Timing Specifications

This section describes the RMII transmit and receive AC timing specifications.

8.2.7.1

RMII Transmit AC Timing Specifications

The RMII transmit AC timing specifications are in Table 34.

Table 34. RMII Transmit AC Timing Specifications

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

TSEC

n_TX_CLK clock period

tRMT

15.0

20.0

25.0

TSEC

n_TX_CLK duty cycle

tRMTH

TSEC

n_TX_CLK peak-to-peak jitter

tRMTJ

——

250

Rise time TSEC

n_TX_CLK (20%–80%)

tRMTR

1.0

—

2.0

Fall time TSEC

n_TX_CLK (80%–20%)

tRMTF

1.0

—

2.0

GTX_CLK

tRGT

tRGTH

tSKRGT

TX_CTL

TXD[8:5]

TXD[7:4]

TXD[9]

TXERR

TXD[4]

TXEN

TXD[3:0]

(At Transmitter)

TXD[8:5][3:0]

TXD[7:4][3:0]

TX_CLK

(At PHY)

RX_CTL

RXD[8:5]

RXD[7:4]

RXD[9]

RXERR

RXD[4]

RXDV

RXD[3:0]

RXD[8:5][3:0]

RXD[7:4][3:0]

RX_CLK

(At PHY)

tSKRGT

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