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ST92195D Datasheet(PDF) 147 Page - STMicroelectronics

Part # ST92195D
Description  48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER
PDF  249 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92195D Datasheet(HTML) 147 Page - STMicroelectronics

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ST92195C/D - TELETEXT SLICER AND ACQUISITION UNIT
7.7 TELETEXT SLICER AND ACQUISITION UNIT
7.7.1 Introduction
The Teletext Slicer processes the incoming Com-
posite Video signal (CVBS1 pin) to extract Teletext
data.
The Acquisition Unit filters the data flow from the
slicer and transfers valid line data to the acquisi-
tion buffer where it is read by the TDSRAM inter-
face.
A Hamming decoding function is available for
checking or correcting data after storage.
The Acquisition unit also provides a Teletext signal
quality measure function to evaluate the quality of
the Teletext data reception by testing the HSYNC
pulses or the Hamming error numbers during the
VBI.
7.7.2 Main Features
s
Hardware framing code check
s
Hardware & software data prefiltering per
magazine
s
Real time hardware Hamming 8/4 check on
incoming data
s
Raw data storage of packets in physical order
s
Fully programmable storage address
s
2 acquisition paths for magazine pages and
service packets
s
Asynchronization between deflection and CVBS
Syncs.
s
CVBS signal quality measure through a "Bad TV
line" counter
s
Hamming 24/18 or 8/4 one-shot decoding.
Figure 87. Acquisition & Slicing Unit Block Diagram
n
TTD
TTC
FRWND
CVBS1
FROM
TIMING
CONTROLLER
Hcvbs
FROM/TO
SYNC
EXTRACTOR
+
-
Slicing
Level
Control
Run-in Clock
Detector
TXTSW
TXTESW
Bit Clock
Extractor
Teletext
Slicer Clock
DAC
Data
Extractor
Sequencer
TXTGC0
TXTGC1
VR02109C
ACQUISITION
UNIT



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