CS8952 datasheet(22/82 Pages) CIRRUS

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CS8952

CrystalLAN™ 100BASE-X and 10BASE-T Transceiver

Table 2. 4B5B Symbol Encoding/Decoding

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

CONTROL (Note 2)

11111

0101

IDLE (Note 3)

11000

0101

First Start of Stream Symbol

10001

0101

Second Start of Stream Symbol

01101

0000

First End of Stream Symbol

00111

0000

Second End of Stream Symbol

1. DATA code groups are indicated by RX_DV = 1

2. CONTROL code groups are inserted automatically during transmission in response to

TX_EN. They are not generated through any combination of TXD[3:0] or TX_ER.

3. IDLE is indicated by RX_DV = 0.

Code Violations (RX_ER = 1 or TX_ER = 1)

Name

5-bit Symbol

Normal Mode 4-bit

Nibble

Error Report

Mode 4-bit

Nibble

Comments

CONTROL (Note 1)

11111

0000

This portion of the table relates received

5-bit symbols to received 4-bit nibbles

only. The control code groups may not

be transmitted in the data portion of the

frame.

11000

0000

10001

0000

01101

0000

00111

0000

CODE VIOLATIONS

00100

0000

00000

0110 or 0101 (Note 2)

0001

00001

0110 or 0101 (Note 2)

0111

00010

0110 or 0101 (Note 2)

1000

00011

0110 or 0101 (Note 2)

1001

00101

0110 or 0101 (Note 2)

1010

00110

0110 or 0101 (Note 2)1011

DATA and CONTROL Codes (RX_ER = 0 or TX_ER = 0)

Name

5-bit Symbol

4-bit Nibble

Comments

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