MPC8540CPX667JC datasheet(31/104 Pages) FREESCALE

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MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Ethernet: Three-Speed,10/100, MII Management

Figure 13 shows the RGMII and RTBI AC timing and multiplexing diagrams.

Figure 13. RGMII and RTBI AC Timing and Multiplexing Diagrams

8.3 10/100 Ethernet Controller (10/100 Mbps)—MII Electrical

Characteristics

The electrical characteristics specified here apply to the MII (media independent interface) signals except

MDIO (management data input/output) and MDC (management data clock). The MII interface can be

operated at 3.3 or 2.5 V. Whether the MII interface is operated at 3.3 or 2.5 V, the timing is compliant with

the IEEE 802.3 standard. The electrical characteristics for MDIO and MDC are specified in Section 2.1.3,

“Recommended Operating Conditions.”

8.3.1 MII DC Electrical Characteristics

All MII drivers and receivers comply with the DC parametric attributes specified in Table 30. The potential

applied to the input of a MII receiver may exceed the potential of the receiver’s power supply (that is, a

MII driver powered from a 3.6-V supply driving VOH into a MII receiver powered from a 2.5-V supply).

Tolerance for dissimilar MII driver and receiver supply potentials is implicit in these specifications.

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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