MPC8378E datasheet(34/127 Pages) FREESCALE

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MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

Figure 15 shows the RGMII and RTBI AC timing and multiplexing diagrams.

Figure 15. RGMII and RTBI AC Timing and Multiplexing Diagrams

8.3.5

RMII AC Timing Specifications

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

8.3.5.1

RMII Transmit AC Timing Specifications

The RMII transmit AC timing specifications are in Table 34.

Table 34. RMII Transmit AC Timing Specifications

At recommended operating conditions with LVDD of 3.3 V ± 5%.

Parameter

Symbol1

Min

Typical

Max

Unit

REF_CLK clock period

tRMT

15.0

20.0

25.0

REF_CLK duty cycle

tRMTH

REF_CLK peak-to-peak jitter

tRMTJ

——

250

Rise time REF_CLK (20%–80%)

tRMTR

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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