AC208-DS04-405-R datasheet(25/58 Pages) BOARDCOM

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Preliminary Data Sheet

AC208

07/08/02

B roa dcom

Document

AC208-DS04-405-R

Pin Descriptions

Page 17

Table 10: Configuration and Setup

Pin Name

Pin #

Type

Description

Mode[3]

Mode[2] (LED_D[4])

Mode[1] (LED_D[1])

Mode[0] (LED_D[0])

122

119

118

I,D

Mode[1:0]

Domain A

Domain B

100M Rptr

10M Rptr (Master)

100M Rptr

10M Rptr (Slave, Bridge disable)

100M

Port 7

100M Rptr

10M Rptr (Slave, Bridge, enable

and 10M disable)

Mode[3:2]

MII

Reserved

TP125

1:select 1:1.25 xformer

ChipID[0] (LED_D[3])

ChipID[1] (LED_D[2])

120

121

I,D

To assign chip ID for four devices in a single box. One device

in the box must be assigned with ChipID = 0.

RBP

112

Reference bias resistor. Connected to analog ground through

a 10K (1%) resistor.

Table 11: Clock Reset

Pin Name

Pin #

Type

Description

1 RESET*

1 47

1 I,U

1 Reset to initial and defaulted state. Pulse must be greater than 10 ns.

1 CLK

1 48

1 I

1 25-MHz system clock reference input. This pin shall be connected to an

external 25-MHz clock source. Multiple devices should be synchronous to

the same external clock source.

Table 12: Power and Ground

Pin Name

Pin #

Type

Description

DVCC

115, 126, 10, 23, 39, 46

2.5V power for digital circuit, total of 9 pins.

DGND

114, 116, 117, 5, 15, 32,

45, 49

Ground for digital circuit, total 10 pins.

AVCC

108, 109, 110, 57, 58, 59

2.5V power for analog circuit, total 16 pins.

AGND

105, 62, 65, 66, 69, 74,

77, 78, 81, 86, 89, 90, 93,

98, 101, 102

Ground for analog circuit, total 16 pins

GAVDD

113

2.5V power supply for common analog circuit

GAGND

111, 56

Ground for common analog circuit

Table 13: No Connects

Pin Name

Pin #

Type

Description

N/C

17, 28, 29, 30, 31, 33, 34,

35, 38, 40, 41, 42, 43, 44

N/C

No Connects

AC208-DS04-405-R Datasheet(PDF) 25 Page - Broadcom Corporation.

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