TLK105 Datasheet, PDF (26/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

TLK105
TLK106
SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
www.ti.com
Table 5-1. 4-Bit to 5-Bit Code Table
4-Bit Code
Symbol
5-Bit Code
Receiver Interpretation
0000
0
11110
Data
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
Symbol ⁽¹⁾
IDLE AND CONTROL CODES
5-Bit Code
Inter-Packet IDLE
I
11111
IDLE
First nibble of SSD
J
11000
First nibble of SSD, translated to "0101" following /I/ (IDLE),
else RX_ER asserted high
Second nibble of SSD
K
10001
Second nibble of SSD, translated to "0101" following /J/, else
RX_ER asserted high
First nibble of ESD
T
01101
First nibble of ESD, causes de-assertion of CRS if followed
by /R/, else assertion of RX_ER
Second nibble of ESD
R
00111
Second nibble of ESD, causes de-assertion of CRS if
following /T/, else assertion of RX_ER
Transmit Error Symbol
H
00100
RX_ER
Invalid Symbol
V
V
00000
00001
INVALID
RX_ER asserted high If during RX_DV
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.
5.1.3 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.
5.1.4 NRZI and MLT-3 Encoding
To comply with the TP-PMD standard for 100Base-TX transmission over CAT-5 unshielded twisted pair
cable, the scrambled data must be NRZI encoded. The serial binary data stream output from the NRZI
encoder is further encoded to MLT-3. MLT-3 is a tri-level code where a change in the logic level
represents a code bit '1' and the logic output remaining at the same level represents a code bit '0'.
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Architecture
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