LU3X31T-T64 Datasheet, PDF(13/44 Page) Agere Systems – LU3X31T-T64 Single-Port 3 10/100 Ethernet Transceiver TX

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LU3X31T-T64 Datasheet, PDF (13/44 Pages) Agere Systems – LU3X31T-T64 Single-Port 3 10/100 Ethernet Transceiver TX

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Preliminary Data Sheet

July 2000

LU3X31T-T64 Single-Port 3 V

10/100 Ethernet Transceiver TX

Functional Description (continued)

Assertion of the TXER input while the TXEN input is

also asserted will cause the LU3X31T-T64 to substitute

HALT code-groups for the 5B code derived from data

present at TXD[3:0]. However, the SSD (/J/K) and ESD

(/T/R) will not be substituted with HALT code-groups.

Hence, the assertion of TXER while TXEN is asserted

will result in a frame properly encapsulated with the /J/

K and /T/R delimiters which contains HALT code-

groups in place of the DATA code-groups.

The 100 Mbits/s symbol decoder translates all invalid

code groups into 0Eh by default. In case the ACCEPT

HALT register is set (bit 5 of register 18h), the HALT

code-group (00100) is translated into 05h instead.

Table 10. Symbol Code Scrambler

Symbol

Name

5B Code

[4:0]

11110

01001

10100

10101

01010

01011

01110

01111

10010

10011

10110

10111

11010

11011

11100

11101

11111

11000

10001

01101

00111

00100

00000

00001

00010

00011

00101

00110

01000

01100

10000

11001

4B Code

[3:0]

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

undefined

0101

undefined

Interpretation

DATA 0

DATA 1

DATA 2

DATA 3

DATA 4

DATA 5

DATA 6

DATA 7

DATA 8

DATA 9

DATA A

DATA B

DATA C

DATA D

DATA E

DATA F

IDLE: interstream fill code

First start-of-stream delimiter

Second start-of-stream delimiter

First end-of-stream delimiter

Second end-of-stream delimiter

HALT: transfer error

Invalid code

Lucent Technologies Inc.

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