LXT971ABC datasheet(86/90 Pages) INTEL

86 / 90 page

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver

Datasheet

Document #: 249414

Revision #: 002

Rev. Date: August 7, 2002

20.7:4

LED3

Programming

bits

0000 = Display Speed Status

0001 = Display Transmit Status

0010 = Display Receive Status (Default)

0011 = Display Collision Status

0100 = Display Link Status

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

0010

20.3:2

LEDFREQ5

00 = Stretch LED events to 30 ms.

01 = Stretch LED events to 60 ms.

10 = Stretch LED events to 100 ms.

11 = Reserved.

R/W

20.1

PULSE-

STRETCH

0 = Disable pulse stretching of all LEDs.

1 = Enable pulse stretching of all LEDs.

R/W

20.0

Reserved

Ignore.

R/W

N/A

Table 57. Digital Config Register (Address 26)

Bit

Name

Description

Type 1

Default

26.15:12

Reserved

26.11

MII Drive Strength

1 = Increased MII drive strength

0 = Normal MII drive strength

R/W

26.10

Reserved

26.9

Show Symbol Error

1 = Map Symbol Error Signal To RXER

0 = Normal RXER

R/W

26.8:0

Reserved

1. R/W = Read /Write, RO = Read Only, LH = Latching High

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

Bit

Name

Description

Type 1

Default

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.

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