MT312CSLASHCG datasheet(13/90 Pages) ZARLINK

13 / 90 page

Functional Overview

MT312

1.4.3 The De-interleaver Block

1.4.3.1 DVB

Before transmission, the data bytes are interleaved

with each other in a cyclic pattern of twelve. This

ensures the bytes are spaced out to avoid the

possibility of a noise spike corrupting a group of

consecutive message bytes. The diagram below

shows

conceptually

how

the

convolutional

de-

interleaving system works. The synchronisation byte

is always loaded into the First-In-First-Out (FIFO)

memory in branch 0. The switch is operated at

regular byte intervals to insert successively received

bytes into successive branches. After 12 bytes have

been received, byte 13 is written next to the

synchronisation byte in branch 0, etc. In the MT312,

this de-interleaving function is realised using on-chip

Random Access Memory (RAM).

1.4.3.2 DSS

Before transmission, the data bytes are interleaved

with each other in a cyclic pattern of thirteen. This

ensures the bytes are spaced out to avoid the

possibility of a noise spike corrupting a group of

consecutive message bytes. The diagram below

shows

conceptually

how

the

convolutional

de-

interleaving system works. On the MT312, this

function is realised in the same Random Access

Memory (RAM) as used for DVB, but utilising

different addressing algorithm.

one

byte per

position

17x1

17x2 bytes

17x3 bytes

17x4 bytes

17x5 bytes

17x6 bytes

17x7 bytes

17x8 bytes

17x9 bytes

17x10 bytes

17x11 bytes

Sync word route

Figure 7 - DVB Conceptual diagram o f the conoluntional de-interleaver block

12D

Input

Output

145

Figure 8 - DSS Conceptual diagram of the convolutional de-interleaver block

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