MT312C/CG 데이터 시트보기 (PDF) - Zarlink Semiconductor Inc

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MT312C/CG

Satellite Channel Decoder

Zarlink Semiconductor Inc 

MT312 Contents

Contents

1

1.1

1.2

1.3

1.4

1.4.1.1

1.4.1.2

1.4.2

1.4.3

1.4.3.1

1.4.3.2

1.4.4

1.4.5

1.4.6

1.5

1.5.2

1.6

1.7

1.7.1

1.7.2

Functional Overview ............................................................................................. 10

Introduction ........................................................................................................................................ 10

Analogue-to-Digital Converter ............................................................................................................ 10

QPSK Demodulator ............................................................................................................................ 10

Forward Error Correction .................................................................................................................. 11

Viterbi Error Count Measurement ................................................................................................ 11

Viterbi Error Count Coarse Indication .......................................................................................... 12

The Frame Alignment Block ........................................................................................................ 12

The De-interleaver Block ............................................................................................................. 13

DVB ............................................................................................................................................. 13

DSS ............................................................................................................................................. 13

The Reed Solomon Decoder Block ............................................................................................. 14

The Energy Dispersal (De-Scrambler) Block, DVB only .............................................................. 14

Output Stage ............................................................................................................................... 15

Control ................................................................................................................................................ 15

Symbol Rate and Code Rate Search Mode ................................................................................ 16

Direct Conversion Application ............................................................................................................ 16

DiSEqC™ Transmit and Receive Messages ..................................................................................... 17

DiSEqC™ Transmitting Messages .............................................................................................. 17

DiSEqC™ Receiving Messages .................................................................................................. 17

2

MT312 Software Control ....................................................................................... 18

2.1

MT312 Register Map Overview .......................................................................................................... 18

3

3.1

3.2

3.3

3.4

3.5

3.5.1

3.5.2

3.5.3

3.6

3.6.1

MT312 Initialisation ............................................................................................... 19

The Configuration Register (127) ....................................................................................................... 19

Power Supplies ................................................................................................................................... 19

Initialisation Sequence ....................................................................................................................... 20

Spectral Inversion .............................................................................................................................. 21

MT312 Initialisation Read/Write Registers ......................................................................................... 21

Reset. Register 21 (R/W) ........................................................................................................... 21

MT312 Configuration. Register 127 (R/W) ................................................................................. 22

System Clock Frequency. Register 34 (R/W) ............................................................................. 23

MT312 Initialisation Read Register .................................................................................................... 23

Identification. Register 126 (R) ................................................................................................... 23

4

4.1

4.2

4.3

4.4

4.4.1

4.4.2

4.4.3

4.5

4.5.1

4.5.2

Tuner Control ......................................................................................................... 24

Simple Channel Change Sequence ................................................................................................... 24

Channel Change Sequence with a new Symbol Rate ....................................................................... 24

Channel Change Sequence with Search Mode ................................................................................. 24

Tuner Control Read/Write Registers .................................................................................................. 25

General Purpose Port Control. Register 20 (R/W) ..................................................................... 25

FR LIM: Frequency Limit. Register 37 (R/W) ............................................................................. 26

FR OFF: Frequency Offset. Register 38 (R/W) .......................................................................... 27

Tuner Control Read Registers ........................................................................................................... 27

Measured LNB Frequency Error. Registers 7 - 8 (R) ........................................................................ 27

Frequency Error 1 and 2. Registers 111 - 115 (R) ............................................................................ 28

4

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