MPC8548ECPXATHC datasheet(38/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

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 this table.

Table 34. RMII Transmit AC Timing Specifications

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

TSECn_TX_CLK clock period

tRMT

15.0

20.0

25.0

TSECn_TX_CLK duty cycle

tRMTH

TSECn_TX_CLK peak-to-peak jitter

tRMTJ

——

250

Rise time TSECn_TX_CLK (20%–80%)

tRMTR

1.0

—

2.0

Fall time TSECn_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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