TLK100_11 Datasheet, PDF (27/88 Pages) Texas Instruments – Industrial Temp, Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver

TLK100
www.ti.com
SLLS931B – AUGUST 2009 – REVISED DECEMBER 2009
After the T/R code-group pair, the code-group encoder continuously adds IDLEs into the transmit data
stream until the next transmit packet is detected.
Table 5-1. 4B/5B Code Table
4-Bit Code
Symbol
5-Bit Code
0000
0
11110
0001
1
01001
0010
2
10100
0011
3
10101
0100
4
01010
0101
5
01011
0110
6
01110
0111
7
01111
1000
8
10010
1001
9
10011
1010
A
10110
1011
B
10111
1100
C
11010
1101
D
11011
1110
E
11100
1111
F
11101
DESCRIPTION
IDLE AND CONTROL CODES
Symbol ⁽¹⁾
5-Bit Code
Inter-Packet IDLE
I
11111
First nibble of SSD
J
11000
Second nibble of SSD
K
10001
First nibble of ESD
T
01101
Second nibble of ESD
R
00111
Transmit Error Symbol
H
00100
INVALID CODES
V
00000
V
00001
V
00010
V
00011
V
00101
V
00110
V
01000
V
01100
(1) Control code-groups I, J, K, T and R in data fields will be mapped as invalid codes, together with
RX_ER asserted.
5.1.2 Scrambler
The purpose of the scrambler is to flatten the power spectrum of the transmitted signal, thus reduce EMI.
The scrambler seed is generated with reference to the PHY address so that multiple PHYs that reside
within the system will not use the same scrambler sequence.
Copyright © 2009, Texas Instruments Incorporated
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