5228-DS07-R datasheet(16/100 Pages) BOARDCOM

16 / 100 page

BCM5228

Data Sheet

7/12/04

Broa d c om Co rp o r a t i o n

Page 4

Baseline Wander Correction

Document

5228-DS09-405-R

input signal, and thereby significantly reducing the chance of a receive symbol error. The baseline wander correction circuit

is not required, and is therefore bypassed, in 10BASE-T and 100BASE-FX operating modes

Table 1: 4B5B Encoding

Name

4b Code

5b Code

Meaning

0000

11110

Data 0

0001

01001

Data 1

0010

10100

Data 2

0011

10101

Data 3

0100

01010

Data 4

0101

01011

Data 5

0110

01110

Data 6

0111

01111

Data 7

1000

10010

Data 8

1001

10011

Data 9

1010

10110

Data A

1011

10111

Data B

1100

11010

Data C

1101

11011

Data D

1110

11100

Data E

1111

11101

Data F

0000a

a. Treated as invalid code (mapped to 0111) when received in data field.

11111

Idle

0101a

11000

Start-of-stream delimiter, part 1

0101a

10001

Start-of-stream delimiter, part 2

0000a

01101

End-of-stream delimiter, part 1

0000a

00111

End-of-stream delimiter, part 2

1000

00100

Transmit error (used to force signalling errors)

0111

00000

Invalid code

0111

00001

Invalid code

0111

00010

Invalid code

0111

00011

Invalid code

0111

00101

Invalid code

0111

00110

Invalid code

0111

01000

Invalid code

0111

01100

Invalid Code

0111

10000

Invalid Code

0111

11001

Invalid Code

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