Datasheet

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TLK105

TLK106

SLLSEB8A –AUGUST 2012–REVISED MARCH 2013

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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

IDLE AND CONTROL CODES

DESCRIPTION Symbol

(1)

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 00000 INVALID

RX_ER asserted high If during RX_DV

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.

5.1.3 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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