Datasheet

DP83620

SNLS339C –JANUARY 2011–REVISED APRIL 2013

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10.2.5 LED Direct Control Register (LEDCR)

This register provides the ability to directly control any or all LED outputs. It does not provide read access

to LEDs. In addition, it provides control for the Activity source and blinking LED frequency.

Table 10-20. LED Direct Control Register (LEDCR), address 0x18

Bit Bit Name Default Description

15:1 RESERVED 0000, RO RESERVED: Writes ignored, read as 0.

11 DIS_SPDLED 0, RW 1 = Disable LED_SPEED output

0 = Enable LED_SPEED output

10 DIS_LNKLED 0, RW 1 = Disable LED_LINK output

0 = Enable LED_LINK output

9 DIS_ACTLED 0, RW 1 = Disable LED_ACT output

0 = Enable LED_ACT output

8 LEDACT_RX 0, RW 1 = Activity is only indicated for Receive traffic

0 = Activity is indicated for Transmit or Receive traffic

7:6 BLINK_FREQ 00, RW LED Blink Frequency:

These bits control the blink frequency of the LED_LINK output when blinking on

activity is enabled.

0 = 6 Hz

1 = 12 Hz

2 = 24 Hz

3 = 48 Hz

5 DRV_SPDLED 0, RW 1 = Drive value of SPDLED bit onto LED_SPEED output

0 = Normal operation

4 DRV_LNKLED 0, RW 1 = Drive value of LNKLED bit onto LED_LINK output

0 = Normal operation

3 DRV_ACTLED 0, RW 1 = Drive value of ACTLED bit onto LED_ACT output

0 = Normal operation

2 SPDLED 0, RW Value to force on LED_SPEED output

1 LNKLED 0, RW Value to force on LED_LINK output

0 ACTLED 0, RW Value to force on LED_ACT output

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