VSC8541XMV-02 datasheet(32/101 Pages) MICROCHIP

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Functional Descriptions

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

activity is either transmitted by the PHY or received by the link partner. When disabled, the combine

feature only provides the status of the selected primary function. In this example, only Link1000 asserts

the LED, and the secondary mode, Activity, does not display when the combine feature is disabled.

3.11.4.2 LED Blink or Pulse-Stretch

This behavior is available for LED mode 9 (collision) and LED mode 10 (activity) indications only, and can

be uniquely configured for each LED pin. For more information, see Table 14, page 21. Activity and

collision events can occur randomly and intermittently throughout the link-up period. Blink is a 50% duty

cycle oscillation of asserting and de-asserting an LED pin. Pulse-stretch ensures that an LED is asserted

and de-asserted for a specific period of time when activity is either present or not present. These rates

can also be configured using a register setting.

3.11.4.3 Rate of LED Blink or Pulse-Stretch

This behavior controls the LED blink rate or pulse-stretch length when blink/pulse-stretch is enabled on a

LED pin. The blink rate, which alternates between a high and low voltage level at a 50% duty cycle, can

be set to 2.5 Hz, 5 Hz, 10 Hz, or 20 Hz. For pulse-stretch, the rate can be set to 50 ms, 100 ms, 200 ms,

or 400 ms.

3.11.4.4 LED Pulsing Enable

To provide additional power savings, the LEDs (when asserted) can be pulsed at 5 kHz programmable

duty cycle. The pulsing enable is controlled through register 30, bit 12 and the duty cycle through register

25G, bits 15:8.

3.11.4.5 LED Blink After Reset

The LEDs will blink for one second after COMA_MODE is deasserted (as described in Configuration,

page 27) or a software reset is applied. This feature can be enabled by setting register 19E1, bit 11 = 1.

3.11.4.6 Pulse Programmable Control

These bits add the ability to width and frequency of LED pulses. This feature facilitates power reduction

options.

3.11.4.7 Fast Link Failure

For more information about this feature, see Fast Link Failure Indication, page 24.

3.12

Wake-On-LAN and SecureOn

The VSC8541-02 device supports Wake-on-LAN, an Ethernet networking standard to awaken hosts by

using a “magic packet” that is decoded to ascertain the source, and then assert an interrupt pin or a LED.

The VSC8541-02 device also supports SecureOn to secure Wake-on-LAN against unauthorized access.

The following illustration shows an overview of the Wake-on-LAN functionality.

Figure 17 •

Wake-on-LAN Functionality

Tx Path

Rx Path

Wake-on-LAN

Detect

WOL_MAC_ADDR

ADDR_REPEAT_CNT

Secure-On enable

Secure-On

password length

Secure-On password

WoL Detected

VSC8541XMV-02 Datasheet(PDF) 32 Page - Microchip Technology

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