MT312CSLASHCG datasheet(4/90 Pages) ZARLINK

4 / 90 page

MT312 Contents

Contents

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

1.1

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

1.2

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

1.3

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

1.4

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

1.4.1.1

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

1.4.1.2

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

1.4.2

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

1.4.3

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

1.4.3.1

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

1.4.3.2

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

1.4.4

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

1.4.5

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

1.4.6

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

1.5

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

1.5.2

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

1.6

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

1.7

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

1.7.1

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

1.7.2

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

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

2.1

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

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

3.1

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

3.2

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

3.3

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

3.4

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

3.5

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

3.5.1

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

3.5.2

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

3.5.3

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

3.6

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

3.6.1

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

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

4.1

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

4.2

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

4.3

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

4.4

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

4.4.1

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

4.4.2

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

4.4.3

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

4.5

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

4.5.1

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

4.5.2

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

MT312C/CG Datasheet(PDF) 4 Page - Zarlink Semiconductor Inc

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