Datasheet

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DP83848I
Table 5. 4B5B CCode-group Encoding and Injection
The code-group encoder converts 4-bit (4B) nibble data
generated by the MAC into 5-bit (5B) code-groups for
transmission. This conversion is required to allow control
data to be combined with packet data code-groups. Refer
to
Tab l e 5 for 4B to 5B code-group mapping details.
The code-group encoder substitutes the first 8-bits of the
MAC preamble with a J/K code-group pair (11000 10001)
upon transmission. The code-group encoder continues to
replace subsequent 4B preamble and data nibbles with
corresponding 5B code-groups. At the end of the transmit
packet, upon the deassertion of Transmit Enable signal
from the MAC, the code-group encoder injects the T/R
code-group pair (01101 00111) indicating the end of the
frame.
After the T/R code-group pair, the code-group encoder
continuously injects IDLEs into the transmit data stream
until the next transmit packet is detected (reassertion of
Transmit Enable).
4.1.1 Scrambler
The scrambler is required to control the radiated emissions
at the media connector and on the twisted pair cable (for
DATA CODES
0 11110 0000
1 01001 0001
2 10100 0010
3 10101 0011
4 01010 0100
5 01011 0101
6 01110 0110
7 01111 0111
8 10010 1000
9 10011 1001
A 10110 1010
B 10111 1011
C 11010 1100
D 11011 1101
E 11100 1110
F 11101 1111
IDLE AND CONTROL CODES
H 00100 HALT code-group - Error code
I 11111 Inter-Packet IDLE - 0000 (Note 1)
J 11000 First Start of Packet - 0101 (Note 1)
K 10001 Second Start of Packet - 0101 (Note 1)
T 01101 First End of Packet - 0000 (Note 1)
R 00111 Second End of Packet - 0000 (Note 1)
INVALID CODES
V 00000
V 00001
V 00010
V 00011
V 00101
V 00110
V 01000
V 01100
Note: Control code-groups I, J, K, T and R in data fields will be mapped as invalid codes, together with RX_ER as-
serted.
6.