ST92T195 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92T195

48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER

STMicroelectronics 

ST92195C/D - TELETEXT DISPLAY STORAGE RAM INTERFACE

7.3 TELETEXT DISPLAY STORAGE RAM INTERFACE

7.3.1 Introduction

The Teletext Display RAM (TDSRAM) is used to

hold the Teletext data for display.

It can be shared by the following units:

– Acquisition Unit (AQD). A buffer containing the

teletext data extracted by the slicer from the in-

coming Composite Video signal CVBS1.

– Display Unit (DIS). This OSD generator is de-

scribed in a separate chapter.

– 40-byte buffer unit (MBT). A register mapped

buffer that can be directly accessed by the CPU.

– CPU accesses for control.

The necessary time slots are provided to each unit

for realtime response.

FEATURES:

s Memory mapped in CPU Memory Space

s Direct CPU access without significant slowdown

s 3 types of on-chip hardware DMA

s Row-wise DMA for high speed data treatment

(bufferized 40-byte read - write)

Figure 47. General Block Diagram

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