V62SLASH12615-01XE-R datasheet(45/98 Pages) TI1

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DP83848-EP

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SLLSEC6E – SEPTEMBER 2012 – REVISED JUNE 2019

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Detailed Description

(1)

Control code-groups I, J, K, T, and R in data fields will be mapped as invalid codes, together with RX_ER asserted.

Table 5-6. 4B5B Code-Group Encoding/Decoding

DATA CODES

11110

0000

01001

0001

10100

0010

10101

0011

01010

0100

01011

0101

01110

0110

01111

0111

10010

1000

10011

1001

10110

1010

10111

1011

11010

1100

11011

1101

11100

1110

11101

1111

IDLE AND CONTROL CODES

00100

HALT code-group - Error code

11111

Inter-Packet IDLE - 0000(1)

11000

First Start of Packet - 0101(1)

10001

Second Start of Packet - 0101 (1)

01101

First End of Packet - 0000(1)

00111

Second End of Packet - 0000(1)

INVALID CODES

00000

00001

00010

00011

00101

00110

01000

01100

5.5.1.1.1 Code-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. See Table 5-6 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).

V62/12615-01XE-R Datasheet(PDF) 45 Page - Texas Instruments

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