MPC5121E datasheet(57/86 Pages) FREESCALE

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Electrical and Thermal Characteristics

MPC5121E/MPC5123 Data Sheet, Rev. 4

Freescale Semiconductor

Figure 35. Ethernet Timing Diagram – MII Rx Signal

Figure 36. Ethernet Timing Diagram – MII Tx Signal

Figure 37. Ethernet Timing Diagram – MII Async

Table 32. MII Tx Signal Timing

Sym

Description

Min

Max

Unit

SpecID

TX_CLK rising edge to TXD[3:0], TX_EN, TX_ER

invalid

—

A11.5

TX_CLK rising edge to TXD[3:0], TX_EN, TX_ER valid

—

A11.6

TX_CLK pulse width high

35%

65%

TX_CLK Period1

1 The TX_CLK frequency shall be 25% of the nominal transmit frequency, e.g., a PHY operating at 100 Mb/s must provide

a TX_CLK frequency of 25 MHz and a PHY operating at 10 Mb/s must provide a TX_CLK frequency of 2.5 MHz. See

the IEEE 802.3 Specification.

A11.7

TX_CLK pulse width low

35%

65%

TX_CLK Period1

A11.8

Table 33. MII Async Signal Timing

Sym

Description

Min

Max

Unit

SpecID

CRS, COL minimum pulse width

1.5

—

TX_CLK Period

A11.9

RX_CLK (Input)

RXD[3:0] (inputs)

RX_DV

RX_ER

TX_CLK (Input)

TXD[3:0] (Outputs)

TX_EN

TX_ER

CRS, COL

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