MPC855T datasheet(69/80 Pages) FREESCALE

Nome de Peças	MPC855T

Descrição Electrónicos	Hardware Specifications

PDF	80 Pages

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Fabricante Electrônico	FREESCALE [Freescale Semiconductor, Inc]

Página de início	http://www.freescale.com

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69 / 80 page

MPC860 Family Hardware Specifications, Rev. 7

Freescale Semiconductor

FEC Electrical Characteristics

Figure 71. MII Receive Signal Timing Diagram

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 72 shows the 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_RX_CLK (Input)

MII_RXD[3:0] (Inputs)

MII_RX_DV

MII_RX_ER

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