AM79C975 datasheet(83/304 Pages) AMD

83 / 304 page

Am79C973/Am79C975

P R E L I M INARY

Decoder

The decoder performs the 5B/4B decoding of the re-

ceived code-groups. The five bits of data are decoded

into four bits of nibble data. The decoded nibble is then

forwarded to the PCS Control block to be sent across

the internal MII to the MAC unit. The code-group de-

coding is shown in Table 9.

Table 9. Decoder Code-Group Mapping

PCS Code-Group

Name

RXD[3:0]

Interpretation

1 1 1 1 0

0 0 0 0

Data 0

0 1 0 0 1

0 0 0 1

Data 1

1 0 1 0 0

0 0 1 0

Data 2

1 0 1 0 1

0 0 1 1

Data 3

0 1 0 1 0

0 1 0 0

Data 4

0 1 0 1 1

0 1 0 1

Data 5

0 1 1 1 0

0 1 10

Data 6

0 1 1 1 1

0 1 1 1

Data 7

1 0 0 1 0

1 0 0 0

Data 8

1 0 0 1 1

1 0 0 1

Data 9

1 0 1 1 0

1 0 1 0

Data A

1 0 1 1 1

1 0 1 1

Data B

1 1 0 1 0

1 1 0 0

Data C

1 1 0 1 1

1 1 0 1

Data D

1 1 1 0 0

1 1 1 0

Data E

1 1 1 0 1

1 1 1 1

Data F

1 1 1 1 1

Undefined

IDLE; used as Inter-Stream fill code

1 1 0 0 0

0 1 0 1

Start-of-Stream Delimiter, Part 1 of 2;

always used in pairs with K

1 0 0 0 1

0 1 0 1

Start-of-Stream Delimiter, Part 2 of 2;

always used in pairs with J

0 1 1 0 1

Undefined

End-of-Stream Delimiter, Part 1 of 2; always

used in pairs with R

0 0 1 1 1

Undefined

End-of-Stream Delimiter, Part 2 of 2; always

used in pairs with T

0 0 1 0 0

Undefined

Transmit Error; used to force signaling errors

0 0 0 0 0

Undefined

Invalid Code

0 0 0 0 1

Undefined

Invalid Code

0 0 0 1 0

Undefined

Invalid Code

0 0 0 1 1

Undefined

Invalid Code

0 0 1 0 1

Undefined

Invalid Code

0 0 1 1 0

Undefined

Invalid Code

0 1 0 0 0

Undefined

Invalid Code

0 1 1 0 0

Undefined

Invalid Code

1 0 0 0 0

Undefined

Invalid Code

1 1 0 0 1

Undefined

Invalid Code

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