LXT970A datasheet(34/74 Pages) INTEL

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LXT970A — Dual-Speed Fast Ethernet Transceiver

Datasheet

Table 17. 4B/5B Coding

Code Type

4B Code

3 2 1 0

Name

5B Symbol

4 3 2 1 0

Interpretation

0 0 0 0

1 1 1 1 0

Data 0

0 0 0 1

0 1 0 0 1

Data 1

0 0 1 0

1 0 1 0 0

Data 2

0 0 1 1

1 0 1 0 1

Data 3

0 1 0 0

0 1 0 1 0

Data 4

0 1 0 1

0 1 0 1 1

Data 5

0 1 1 0

0 1 1 1 0

Data 6

DATA

0 1 1 1

0 1 1 1 1

Data 7

1 0 0 0

1 0 0 1 0

Data 8

1 0 0 1

1 0 0 1 1

Data 9

1 0 1 0

1 0 1 1 0

Data A

1 0 1 1

1 0 1 1 1

Data B

1 1 0 0

1 1 0 1 0

Data C

1 1 0 1

1 1 0 1 1

Data D

1 1 1 0

1 1 1 0 0

Data E

1 1 1 1

1 1 1 0 1

Data F

IDLE

undefined

I 1

1 1 1 1 1

Idle. Used as inter-stream fill code

0 1 0 1

J 2

1 1 0 0 0

Start-of-Stream Delimiter (SSD), part 1 of 2

CONTROL

0 1 0 1

K 2

1 0 0 0 1

Start-of-Stream Delimiter (SSD), part 2 of 2

undefined

T 3

0 1 1 0 1

End-of-Stream Delimiter (ESD), part 1 of 2

undefined

R 3

0 0 1 1 1

End-of-Stream Delimiter (ESD), part 2 of 2

undefined

H 4

0 0 1 0 0

Transmit Error. Used to force signaling errors

undefined

Invalid

0 0 0 0 0

Invalid

undefined

Invalid

0 0 0 0 1

Invalid

undefined

Invalid

0 0 0 1 0

Invalid

INVALID

undefined

Invalid

0 0 0 1 1

Invalid

undefined

Invalid

0 0 1 0 1

Invalid

undefined

Invalid

0 0 1 1 0

Invalid

undefined

Invalid

0 1 0 0 0

Invalid

undefined

Invalid

0 1 1 0 0

Invalid

undefined

Invalid

1 0 0 0 0

Invalid

undefined

Invalid

1 1 0 0 1

Invalid

1. The /I/ (Idle) code-group is sent continuously between frames.

2. The /J/ and /K/ (SSD) code-groups are always sent in pairs; /K/ follows /J/.

3. The /T/ and /R/ (ESD) code-groups are always sent in pairs; /R/ follows /T/.

4. An /H/ (Error) code-group is used to signal an error condition.

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