5222-DS02-R datasheet(50/76 Pages) BOARDCOM

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BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 38

10BASE-T Auxiliary Error and General Status Register

Document 5222-DS02-405-R

10BASE-T AUXILIARY ERROR AND GENERAL STATUS REGISTER

MDIX STATUS

When read as a 1, this bit indicates that the BCM5222 has its MDI TD+ and RD+ signals swapped either due to manually

setting MDIX Swap bit to a 1 or through HP Auto-MDIX function if it is enabled and the BCM5222 has detected a MDI cross-

over cable.

MDIX MANUAL SWAP

When this bit is set to a 1, the BCM5222 forces its MDI TD+ and RD+ signals to be swapped.

HP AUTO-MDIX DISABLE

When this bit is set to a 1, then the BCM5222 disables the HP Auto-MDIX function.

Table 23: 10BASE-T Auxiliary Error & General Status Register (Address 28d, 1Ch)

Bit

Name

R/W

Description

Default

15:14

Reserved

Ignore when read

MDIX Status

0 = MDI is in use

1 = MDIX is in use

MDIX Manual Swap

0 = MDI or MDIX if MDIX is not disabled

1 = Force MDIX

HP Auto-MDIX disable

R/W

0 = Enable HP Auto-MDIX

1 = Disable HP Auto-MDIX

Manchester Code Error

1 = Manchester code error (10BASE-T)

End Of Frame Error

1 = EOF detection error (10BASE-T)

8:4

Reserved

Ignore when read

00000

Auto-Negotiation Indication

1 = Auto-negotiation activated

0 = Speed forced manually

Force 100/10 Indication

1 = Speed forced to 100BASE-TX

0 = Speed forced to 10BASE-T

Speed Indication

1 = 100BASE-TX

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 BCM5222, 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.

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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