5228-DS09-405-R datasheet(69/100 Pages) BOARDCOM

69 / 100 page

Data Sheet

BCM5228

7/12/04

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

Document

5228-DS09-405-R

10BASE-T Auxiliary Error and General Status Register

Page 57

Block 10BASE-T Echo Mode. When enabled, during 10BASE-T half-duplex transmit operation, the TXEN signal does not

echo onto the RXDV pin. The TXEN echoes onto the CRS pin, and the CRS deassertion directly follows the TXEN

deassertion.

Traffic Meter LED Mode. When enabled, the Activity LEDs (ACTLED# and FDXLED# if full-duplex LED and interrupt LED

modes are not enabled) do not blink based on the internal LED clock (approximately 80 µs of time). Instead, they blink based

on the rate of receive and transmit activity. Each time a receive or transmit operation occurs, the LED turns on for a minimum

of 5 µs. During light traffic, the LED blinks at a low rate, while during heavier traffic the LEDs remain on.

Activity LED Force On. When set to 1, the Col LED, Transmit LED, Receive LED, and Activity LED are turned on. This bit

has a higher priority than the Activity LED Force Inactive, bit 4, register 1Dh.

Activity/Link LED Mode. When enabled, the receive output goes active upon acquiring link and pulses during receive or

transmit activity.

Qual Parallel Detect Mode. This bit allows the auto-negotiation/parallel detection process to be qualified with information

in the Advertisement register.

If this bit is not set, the local BCM5228 device is enabled to auto-negotiate, and the far-end device is a 10BASE-T or

100BASE-X non auto-negotiating legacy type, the local device auto-negotiates/parallel-detects the far-end device,

regardless of the contents of its Advertisement register (04h).

If this bit is set, the local device compares the link speed detected to the contents of its Advertisement register. If the

particular link speed is enabled in the Advertisement register, the local device asserts link. If the link speed is disabled in this

10BASE-T AUXILIARY ERROR AND GENERAL STATUS REGISTER

Table 36: 10BASE-T Auxiliary Error and General Status Register (Address 28d, 1Ch)

Bit

Name

R/W

Description

Default

15:14

Reserveda

––

MDIX Status

0 = MDI is in use

1 = MDIX is in use

MDIX Manual Swap

R/W

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)

Reserveda

––

7:5

Reserveda

––

001

Reserveda

––

Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear

after read operation.

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