CS8952 Ver la hoja de datos (PDF) - Cirrus Logic

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CS8952

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

Cirrus Logic 

CS8952

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

Name

5-bit Symbol 4-bit Nibble

Comments

2

10100

0010

3

10101

0011

4

01010

0100

5

01011

0101

6

01110

0110

7

01111

0111

8

10010

1000

9

10011

1001

A

10110

1010

B

10111

1011

C

11010

1100

D

11011

1101

E

11100

1110

F

11101

1111

CONTROL (Note 2)

I

11111

0101

IDLE (Note 3)

J

11000

0101

First Start of Stream Symbol

K

10001

0101

Second Start of Stream Symbol

T

01101

0000

First End of Stream Symbol

R

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.

Table 2. 4B5B Symbol Encoding/Decoding

Name

5-bit Symbol

CONTROL (Note 1)

I

11111

J

11000

K

10001

T

01101

R

00111

CODE VIOLATIONS

H

00100

V0

00000

V1

00001

V2

00010

V3

00011

V4

00101

V5

00110

Code Violations (RX_ER = 1 or TX_ER = 1)

Normal Mode 4-bit

Nibble

Error Report

Mode 4-bit

Nibble

Comments

0000

0000

0000

0000

0000

0000

0000

0000

0000

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.

0000

0110 or 0101 (Note 2)

0110 or 0101 (Note 2)

0110 or 0101 (Note 2)

0110 or 0101 (Note 2)

0110 or 0101 (Note 2)

0110 or 0101 (Note 2)

0000

0001

0111

1000

1001

1010

1011

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

21

DS206F1

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