MPC5200B datasheet(39/72 Pages) FREESCALE

部件名	MPC5200B

功能描述	SDRAM / DDR Memory Controller

PDF	72 Pages

Scroll/Zoom	100%

制造商	FREESCALE [Freescale Semiconductor, Inc]

网页	http://www.freescale.com

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39 / 72 page

MPC5200B Data Sheet, Rev. 3

Freescale Semiconductor

Figure 28. Ethernet Timing Diagram—MII Tx Signal

Figure 29. 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

5—

A9.5

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

—

A9.6

TX_CLK pulse width high

35%

65%

TX_CLK Period(1)

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.

A9.7

TX_CLK pulse width low

35%

65%

TX_CLK Period(1)

A9.8

Table 33. MII Async Signal Timing

Sym

Description

Min

Max

Unit

SpecID

CRS, COL minimum pulse width

1.5

—

TX_CLK Period

A9.9

TX_CLK (Input)

TXD[3:0] (Outputs)

TX_EN

TX_ER

CRS, COL

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