TPU2735 Просмотр технического описания (PDF) - Unspecified

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TPU2735

Teletext Processor

Unspecified 

TPU 2735

Teletext Processor for Level 1 Teletext

Note:

If not otherwise designated the pin numbers men-

tioned refer to the 40-pin DIL package.

1. Introduction

The TPU 2735 is specified to handle Level-1-Teletext in-

formation (in Germany: Videotext) as it is transmitted to-

day by the TV broadcast stations in Great Britain, Ger-

many and other European countries. The TPU 2735 is

part of the DIGIT 2000 digital TV system and works in

conjunction with the other VLSI circuits and processors

of this system. This makes the Teletext adapter de-

signed with the TPU 2735 very simple and economic

(see Fig. 1–1).

The TPU 2735 is an N-channel VLSI MOS circuit,

housed in a 40-pin Dil plastic package and contains on

a single silicon chip the following functions:

– one-chip solution of the Teletext processing (except

for external RAM)

– ghost compensation to eliminate the effects of ghost

pictures due to reflections

– reduced access time is provided for the Teletext pages

by receiving and storing up to eight pages in one go

– up to 32 stored pages

– automatic language-dependent character selection

– switchover facility PAL/NTSC/D2MAC

– full level one features (FLOF) support

– level 1.5 Spanish Teletext support

– largely compatible to the TPU 2732/33

Tuner

IF

Amplifier

Teletext Adapter

64 kBit

256 kBit

D RAM

VCU 2133 or

VCU 2134

6

4

TPU 2735

Teletext

Processor

to CRT

MCU 2600

MAIN

Clock Gen.

Keyboard

3

CCU 20XX or

CCU 3000

Central

Control Unit

SAA 1250

IR Trans–

mitter

TBA 2800

IR

Preamplifier

Fig. 1–1: Teletext application block diagram

4

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