MPC8548ECPXATHC datasheet(32/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC)

Figure 10 shows the GMII receive AC timing diagram.

Figure 10. GMII Receive AC Timing Diagram

8.2.3

MII AC Timing Specifications

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

8.2.3.1

MII Transmit AC Timing Specifications

This table provides the MII transmit AC timing specifications.

Table 28. MII Transmit AC Timing Specifications

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

TX_CLK clock period 10 Mbps

tMTX

—400

—

TX_CLK clock period 100 Mbps

tMTX

—40—

TX_CLK duty cycle

tMTXH/tMTX

—

TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay

tMTKHDX

TX_CLK data clock rise (20%–80%)

tMTXR

1.0

—

4.0

TX_CLK data clock fall (80%–20%)

tMTXF

1.0

—

4.0

Notes:

1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for

inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMTKHDX symbolizes MII transmit

timing (MT) for the time tMTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,

the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.

For example, the subscript of tMTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is

used with the appropriate letter: R (rise) or F (fall).

2. Guaranteed by design.

RX_CLK

RXD[7:0]

tGRDXKH

tGRX

tGRXH

tGRXR

tGRXF

tGRDVKH

RX_DV

RX_ER

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