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BCM5722 Programmer’s Guide

10/15/07

Broadcom Corporation

Page 503 Transceiver Registers (BCM5906/BCM5906M) Document 5722-PG101-R

Traffic Meter LED Mode

When enabled, the Activity LEDs (ACTLED and FDXLED if full-duplex LED and interrupt LED modes are not enabled) does

not blink based on the internal LED clock (approximately 80 ms on 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 ms. During light

traffic, the LED blinks at a low rate, while during heavier traffic the LEDs remain on.

Serial LED Mode

When enabled, normal serial LED mode is enabled. Serial LED mode can also be enabled through hardware during power-

on reset. Note that this bit is available only in PHY 1 of 8. This bit in all other PHY are reserved.

Activity LED Force On

When asserted, the activity LEDs (ACTLED and FDXLED if full-duplex LED and interrupt LED modes are not enabled) are

turned on. This bit has a higher priority than the Activity LED Force Inactive, bit 4 of MII register 1Dh.

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

transmit activity, otherwise known as blinking link LED.

Qualified 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 PHY 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 will auto-negotiate/parallel-detect 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