AM79C875KC datasheet(17/48 Pages) AMD

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Am79C875

Table 1. Code-Group Mapping

MII (TXD[3:0])

Name

PCS Code-Group

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 10

0 1 1 1 0

Data 6

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

Undefined

1 1 1 1 1

IDLE; used as inter-Stream fill code

0 1 0 1

1 1 0 0 0

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

in pairs with K

0 1 0 1

1 0 0 0 1

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

in pairs with J

Undefined

0 1 1 0 1

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

pairs with R

Undefined

0 0 1 1 1

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

pairs with T

Undefined

0 0 1 0 0

Transmit Error; used to force signaling errors

Undefined

0 0 0 0 0

Invalid Code

Undefined

0 0 0 0 1

Invalid Code

Undefined

0 0 0 1 0

Invalid Code

Undefined

0 0 0 1 1

Invalid Code

Undefined

0 0 1 0 1

Invalid Code

Undefined

0 0 1 1 0

Invalid Code

Undefined

0 1 0 0 0

Invalid Code

Undefined

0 1 1 0 0

Invalid Code

Undefined

1 0 0 0 0

Invalid Code

Undefined

1 1 0 0 1

Invalid Code

In 100BASE-FX mode, the external fiber-optic receiver

performs the signal energy detection function and com-

municates this information directly to the NetPHY™

4LP device through SDI± pins.

In 10BASE-T mode, a link-pulse detection circuit will

constantly monitor the RX± pins for the presence of

valid link pulses.

10BASE-T Block

The NetPHY™ 4LP transceiver incorporates four fully

independent 10BASE-T physical layer functions, in-

cluding clock recovery (ENDEC), MAUs, and trans-

ceiver functions. The NetPHY™ 4LP transceiver

receives 10-Mbps data from the MAC, switch, or re-

peater across the RMII at 5 million di-bits per second.

It then Manchester encodes the data before transmis-

sion to the network.

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