VSC8541-02 datasheet(53/101 Pages) MICROCHIP

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Registers

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

information about LED modes, see Table 14, page 21. For information about enabling the extended LED

mode bits in Register 19E1 bits 13 to 12, see Table 16, page 22.

4.2.27

LED Behavior

The bits in register 30 control and enable you to read the status of the pulse or blink rate of the device

LEDs. The following table shows the settings you can write to the register or read from the register.

Note: Bits 30.11:10 are active only in port 0 and affect the behavior of LEDs for all the ports.

4.2.28

Extended Page Access

To provide functionality beyond the IEEE 802.3-specified registers and main device registers, an

extended set of registers provide an additional 15 register spaces.

Table 47 •

LED Mode Select, Address 29 (0x1D)

Bit

Name

Access Description

Default

Reserved

Reserved.

14:8

Reserved

Reserved.

7:4

LED1 mode select R/W

Sticky bit. Select from LED modes 0–15.

0101

3:0

LED0 mode select R/W

Sticky bit. Select from LED modes 0–15.

0100

Table 48 •

LED Behavior, Address 30 (0x1E)

Bit

Name

Access Description

Default

15:13 Reserved

Reserved.

LED pulsing enable

R/W

Sticky bit.

0: Normal operation.

1: LEDs pulse with a 5 kHz, programmable duty

cycle when active.

11:10

LED blink/pulse-stretch rate

R/W

Sticky bit.

00: 2.5 Hz blink rate/400 ms pulse-stretch.

01: 5 Hz blink rate/200 ms pulse-stretch.

10: 10 Hz blink rate/100 ms pulse-stretch.

11: 20 Hz blink rate/50 ms pulse-stretch.

The blink rate selection sets the rate used for all

LED pins.

9:7

Reserved

Reserved.

LED1 pulse-stretch/blink select R/W

Sticky bit.

1: Pulse-stretch.

0: Blink.

LED0 pulse-stretch/blink select R/W

Sticky bit.

1: Pulse-stretch.

0: Blink.

4:2

Reserved

Reserved.

LED1 combine feature disable R/W

Sticky bit.

0: Combine enabled (link/activity, duplex/collision).

1: Disable combination (link only, duplex only).

LED0 combine feature disable R/W

Sticky bit.

0: Combine enabled (link/activity, duplex/collision).

1: Disable combination (link only, duplex only).

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