LXT971ABC datasheet(85/90 Pages) INTEL

85 / 90 page

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver

Datasheet

Document #: 249414

Revision #: 002

Rev. Date: August 7, 2002

Table 56. LED Configuration Register (Address 20, Hex 14)

Bit

Name

Description

Type 1

Default

20.15:12

LED1

Programming

bits

0000 = Display Speed Status (Continuous, Default)

0001 = Display Transmit Status (Stretched)

0010 = Display Receive Status (Stretched)

0011 = Display Collision Status (Stretched)

0100 = Display Link Status (Continuous)

0101 = Display Duplex Status (Continuous)

0110 = Unused

0111 = Display Receive or Transmit Activity (Stretched)

1000 = Test mode- turn LED on (Continuous)

1001 = Test mode- turn LED off (Continuous)

1010 = Test mode- blink LED fast (Continuous)

1011 = Test mode- blink LED slow (Continuous)

1100 = Display Link and Receive Status combined 2

(Stretched)3

1101 = Display Link and Activity Status combined 2

(Stretched)3

1110 = Display Duplex and Collision Status combined 4

(Stretched)3

1111 = Unused

R/W

0000

20.11:8

LED2

Programming

bits

0000 = Display Speed Status

0001 = Display Transmit Status

0010 = Display Receive Status

0011 = Display Collision Status

0100 = Display Link Status (Default)

0101 = Display Duplex Status

0110 = Unused

0111 = Display Receive or Transmit Activity

1000 = Test mode- turn LED on

1001 = Test mode- turn LED off

1010 = Test mode- blink LED fast

1011 = Test mode- blink LED slow

1100 = Display Link and Receive Status combined 2

(Stretched)3

1101 = Display Link and Activity Status combined 2

(Stretched)3

1110 = Display Duplex and Collision Status combined 4

(Stretched)3

1111 = Unused

R/W

0100

1. R/W = Read /Write

RO = Read Only

LH = Latching High

2. Link status is the primary LED driver. The LED is asserted (solid ON) when the link is up.

The secondary LED driver (Receive or Activity) causes the LED to change state (blink).

3. Combined event LED settings are not affected by Pulse Stretch Register bit 20.1. These display settings

are stretched regardless of the value of 20.1.

4. Duplex status is the primary LED driver. The LED is asserted (solid ON) when the link is full-duplex.

Collision status is the secondary LED driver. The LED changes state (blinks) when a collision occurs.

5. Values are relative approximations. Not guaranteed or production tested.

LXT971ABC Datasheet(PDF) 85 Page - Intel Corporation

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