AC104X-DS00-R datasheet(21/50 Pages) BOARDCOM

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Preliminary Data Sheet

■ AC104X

12/11/01

B roa dcom Co rpo rat ion

Document

AC104X-DS00-405-R

Section 2: Pin Description

Page 13

Table 5:

PHY Address Pins

Pin Name

Pin #

Type

Description

PHYAD_ST

I/O,D

This pin sets the two least significant digits of the PHY address for all four ports ac-

cording to the two options below:

1 at reset = A-XXX00, B-XXX01, C-XXX10, D-XXX11

0 at reset = A-XXX01, B-XXX10, C-XXX11, D-XXX00

PHYAD [4]

PHYAD [3]

PHYAD [2]

I/O

PHY Address [4:2]. These pins set the three most significant digits for the PHY ad-

dress. PHYAD [4] sets the most significant digit. PHYAD [1:0] are internally set ac-

cording to the status of PHYAD_ST. The PHYAD determines the scramble seed,

and helps to reduce EMI when there are multiple ports switching at the same time.

Table 6:

Mode Pins

Pin Name

Pin #

Type

Description

AUTO_MDIX_DIS

I/O

Auto-MDIX Disable. Pulled up upon reset will turn off the Auto-MDIX future.

DPLX

I/O

Full-Duplex Mode. The default value of the control bit (Reg.0.8) is dependent on

this pin when the ANEGA pin is pulled-low/asserted-low. When asserted high, the

PHY operates in full-duplex mode as the default mode.

FORCE100

I/O

FORCE100: Force 100BASE-TX Operation. When this signal is pulled high and

ANEGA is low upon reset, all ports are forced to 100BASE-TX operation. When

asserted low and ANEGA is low, all ports are forced to 10BASE-T operation.

When ANEGA is high, FORCE100 has no effect on operation.

SCRAM_EN

I/O

Scrambler Enable. Pulled high under normal circumstances to enable scrambler

and de-scrambler. If pulled low upon reset, scrambling functions will be disabled.

ANEGA

I/O

Auto-Negotiation Ability. Asserted high means auto-negotiation enable while low

means manual selection through DPLX, FORCE100.

BURN_IN*

I/O

Burn-In mode. Burn-in mode for reliability assurance control. This is reserved for

factory testing only.

COL_LED_EN

I/O

If pulled high with 10k

Ω, LEDDPX pins will toggle whenever there is a Collision

detected in half-duplex. (Should be pulled-high!) If pulled low, LEDDPX pins will

not toggle.

AC104X-DS00-R 数据表(PDF) 21 Page - Broadcom Corporation.

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