MPC855T datasheet(68/80 Pages) FREESCALE

Numer części	MPC855T

Szczegółowy opis	PowerQUICC??Family Hardware Specifications

PDF	80 Pages

Scroll/Zoom	100%

Producent	FREESCALE [Freescale Semiconductor, Inc]

Strona internetowa	http://www.freescale.com

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68 / 80 page

MPC860 PowerQUICC™ Family Hardware Specifications, Rev. 8

Freescale Semiconductor

FEC Electrical Characteristics

13.2

MII Transmit Signal Timing (MII_TXD[3:0], MII_TX_EN,

MII_TX_ER, MII_TX_CLK)

The transmitter functions correctly up to a MII_TX_CLK maximum frequency of 25 MHz +1%. There is

no minimum frequency requirement. In addition, the processor clock frequency must exceed the

MII_TX_CLK frequency – 1%.

Table 30 provides information on the MII transmit signal timing.

Figure 73 shows the MII transmit signal timing diagram.

Figure 73. MII Transmit Signal Timing Diagram

Table 30. MII Transmit Signal Timing

Num

Characteristic

Min

Max

Unit

MII_TX_CLK to MII_TXD[3:0], MII_TX_EN, MII_TX_ER invalid

—

MII_TX_CLK to MII_TXD[3:0], MII_TX_EN, MII_TX_ER valid

—

MII_TX_CLK pulse width high

65%

MII_TX_CLK

period

MII_TX_CLK pulse width low

35%

65%

MII_TX_CLK

period

MII_TX_CLK (Input)

MII_TXD[3:0] (Outputs)

MII_TX_EN

MII_TX_ER

RMII_REFCLK

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