AC207-DS03-R datasheet(23/60 Pages) BOARDCOM

23 / 60 page

Preliminary Data Sheet

AC207

07/08/02

B roa dcom

Document

AC207-DS04-405-R

Pin Descriptions

Page 13

Table 5: MII (Media Independent) Pins

Pin Name

Pin #

Type

Description

MII_TXD3

MII_TXD2

MII_TXD1

MII_TXD0

I,D

MII transmit data. The MAC sources MII_TXD[3:0] synchronous

with MII_TXCLK when MII_TXEN is asserted.

MII_TXCLK

O,D,S

MII transmit clock. Continuous (25 MHz/2.5 MHz) clock output used

by MAC to synchronize MII_TXEN, MII_TXD[3:0], and MII_TXER.

MII_TXEN

I,D

MII transmit enable. Indicates MAC has presented valid data on the

MII_TXD[3:0].

MII_RXD3/MII_SPDSEL

MII_RXD2/MODE3

MII_RXD1/TP125

MII_RXD0

I/O,U

I/O,D

I/O,U

O,U

MII receive data. The Phy will source MII_RXD[3:0] synchronous

with MII_RXCLK when MII_RXDV is asserted.

After power-on, the MII_SPDSEL is latched for port speed selec-

tion. 1=100Mb, 0=10Mb

MII_RXCLK

O,D,S

MII transmit clock. continuous (25 MHz/2.5 MHz) clock output used

by MAC to synchronize MII_RXDV, MII_RXD[3:0], and MII_RXER.

MII_RXDV

O,D

MII Receive data-valid. Phy has presented valid recovered on the

MII_RXD[3:0].

MII_CRS

O,D

MII carrier sense. Active when carrier has been sensed.

MII_RXER

O,D

MII receive error. Indicates Phy has received invalid symbol data.

MII_COL

O,D

MII collision detection. Active when collision is detected.

Table 6: 7-wire (Serial Network Interface) Pins

Pin Name

Pin #

Type

Description

SNI_TXD (MII_TXD0)

I,D

Serial transmit data. The MAC sources SNI_TXD synchronous

with SNI_TXCLK when SNI_TXEN is asserted.

SNI_TXCLK (MII_TXCLK)

Serial transmit clock. continuous (10 MHz) clock output used by

MAC to synchronize SNI_TXEN and SNI_TXD.

SNI_TXEN (MII_TXEN)

I,D

Serial transmit enable. Indicates MAC has presented valid data on

the SNI_TXD.

SNI_RXD (MII_RXD0)

Serial receive data. The Phy sources SNI_RXD synchronous with

SNI_RXCLK when SNI_CRS is asserted.

SNI_RXCLK (MII_RXCLK)

Serial receive clock. Continuous (10 MHz) clock output used by

MAC to synchronize SNI_CRS and SNI_RXD.

SNI_CRS (MII_CRS)

Serial carrier sense. Active when carrier has been sensed.

SNI_COL (MII_COL)

Serial collision detection. Active when collision is detected.

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