AC208-DS03-R datasheet(29/58 Pages) BOARDCOM

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Preliminary Data Sheet

AC208

07/08/02

B roa dcom

Document

AC208-DS04-405-R

Page 21

INITIAL DEVICE CONFIGURATION REGISTER

Table 17: Initial Device Configuration Register

Name

Type

Address

Description

MII Configuration

R/W

Used to give the status of MII port. Default is set by pin.

Bit

Name

Type

Description

Default

15:12

Mode

Mode[3:2]

Must be 00.

MODE pins

Mode[1:0]

Master mode, Bridge enable.

Slave mode, Bridge disable.

Slave mode, Uplink.

Port 7 is connected to the bridge

port in this mode. The other bridge

port is connected to 100 segment.

Slave mode, Bridge enable (mulit-

bridge mode).

Reserved

(Write clear enable)

Reserved

(MIB enable)

Reserved.

Disable partition

R/W

1:disable partition function of MII interface.

External transform

selection

R/W

1:external transform 1:1.25, 0:external transform

1:1.

Ext pin

MIIB Speed Select

R/W

1:100M interface, 0:10M interface.

Ext Pin

6:2

Switch debug

R/W

Selection control for debugging signals.

00000

100M repeater

Partition Alternative

R/W

0 = normal, un-partition a port only when data can

be transmitted out from the port for 560 bit-time

without a collision.

1 = alternate, un-partition a port when data can be

either transmitted from the port or received from the

port for 560 bit-time without a collision.

10M repeater Partition

Alternative

R/W

0 = normal, un-partition a port when data can be

either transmitted from the port or received from the

port for 560 bit-time without a collision.

1 = alternate, un-partition a port only when data can

be received from the port for 560 bit-time without a

collision

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