5220-DS02-R datasheet(61/90 Pages) BOARDCOM

61 / 90 page

Preliminary Data Sheet

BCM5220

04/20/04

Broa d c om Co rp o r a t i o n

Document

5220-DS04-405-R

Auxiliary Mode 2 Register

Page 49

10BASE-T AUXILIARY ERROR & GENERAL STATUS REGISTER

Manchester Code Error

Indicates that a Manchester code violation was received. This bit is only valid during 10BASE-T operation.

End of Frame Error

Indicates that the End Of Frame (EOF) sequence was improperly received, or not received at all. This error bit is only valid

during 10BASE-T operation.

Auto-Negotiation Indication

This read-only bit indicates whether auto-negotiation has been enabled or disabled on the BCM5220. A combination of a 1

in bit 12 of the Control register and a logic 1 on the ANEN input pin is required to enable auto-negotiation. When auto-

negotiation is disabled, bit 15 of the Auxiliary Mode register returns a 0. At all other times, it returns a 1.

Force 100/10 Indication

This read-only bit returns a value of 0 when one of following two cases is true:

•

The ANEN pin is low AND the F100 pin is low. (or)

•

Bit 12 of the Control register has been written 0 AND bit 13 of the Control register has been written 0.

Table 27: 10BASE-T Auxiliary Error & General Status Register (Address 28d, 1Ch)

Bit

Name

R/W

Description

Default

15:11

Reserveda

Ignore when read

00001

Manchester Code Error

1 = Manchester code error (10BASE-T)

End Of Frame Error

1 = EOF detection error (10BASE-T)

Reserveda

Ignore when read

7:5

Reserveda

Ignore when read

001

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

Ignore when read

Auto-Negotiation Indication

1 = Auto-negotiation activated

0 = Speed forced manually

Force 100/10 Indication

1 = Speed forced to 100BASE-X

0 = Speed forced to 10BASE-T

Speed Indication

1 = 100BASE-X

0 = 10BASE-T

Full-duplex Indication

1 = Full-duplex active

0 = Full-duplex not active

Note: All Error bits in the Auxiliary Error and General Status register are read-only and are latched high. When certain types

of errors occur in the BCM5201, one or more corresponding error bits become “1”. They remain so until the register is read,

or until a chip reset occurs. All such errors necessarily result in data errors, and are indicated by a high value on the RXER

output pin at the time the error occurs.

Notes: R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL & LH Clear after

read operation. Use default values of reserved bit(s) when writing to reserved bit(s).

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