MPC855T datasheet(67/76 Pages) MOTOROLA

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MOTOROLA

MPC860 Family Hardware Speciﬁcations

MII Receive Signal Timing (MII_RXD[3:0], MII_RX_DV, MII_RX_ER, MII_RX_CLK)

13.1 MII Receive Signal Timing (MII_RXD[3:0],

MII_RX_DV, MII_RX_ER, MII_RX_CLK)

The receiver functions correctly up to a MII_RX_CLK maximum frequency of 25 MHz

+1%. There is no minimum frequency requirement. In addition, the processor clock

frequency must exceed the MII_RX_CLK frequency – 1%.

Table 13-27 provides information on the MII receive signal timing.

Figure 13-70 shows MII receive signal timing.

Figure 13-70. 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 13-28 provides information on the MII transmit signal timing.

Table 13-27. MII Receive Signal Timing

Num

Characteristic

Min

Max

Unit

MII_RXD[3:0], MII_RX_DV, MII_RX_ER to MII_RX_CLK setup

—

MII_RX_CLK to MII_RXD[3:0], MII_RX_DV, MII_RX_ER hold

—

MII_RX_CLK pulse width high

35%

65%

MII_RX_CLK

period

MII_RX_CLK pulse width low

35%

65%

MII_RX_CLK

period

MII_RX_CLK (Input)

MII_RXD[3:0] (Inputs)

MII_RX_DV

MII_RX_ER

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