SAA5502PS datasheet(42/80 Pages) PHILIPS

42 / 80 page

1999 Oct 27

Philips Semiconductors

Preliminary speciﬁcation

Standard TV microcontrollers with

On-Screen Display (OSD)

SAA55xx

18 DATA CAPTURE

The Data Capture section takes in the analog Composite

Video and Blanking Signal (CVBS), and from this extracts

the required data, which is then decoded and stored in

memory.

The extraction of the data is performed in the digital

domain. The first stage is to convert the analog CVBS

signal into a digital form. This is done using an ADC

sampling at 12 MHz. The data and clock recovery is then

performed by a Multi-Rate Video Input Processor

(MulVIP). From the recovered data and clock the following

data types are extracted: WST Teletext (625/525), VPS

and WSS. The extracted data is stored in either memory

(DRAM) via the Memory interface or in SFR locations.

18.1

Data Capture features

• Two CVBS inputs

• Video Signal Quality detector

• Data Capture for 625-line WST

• Data Capture for 525-line WST

• Data Capture for VPS data (Programme Delivery

Control (PDC) system A)

• Data Capture for Wide Screen Signalling (WSS) bit

decoding

• Automatic selection between 525 WST/625 WST

• Automatic selection between 625 WST/VPS on line 16

of Vertical Blanking Interval (VBI)

• Real-time capture and decoding for WST Teletext in

hardware, to enable optimized microprocessor

throughput

• Up to 10 pages stored on-chip

• Inventory of transmitted Teletext pages stored in the

Transmitted Page Table (TPT) and Subtitle Page Table

(SPT)

• Automatic detection of FASTEXT transmission

• Real-time packet 26 engine in hardware for processing

accented, G2 and G3 characters

• Signal quality detector for WST/VPS data types

• Comprehensive Teletext language coverage

• Full Field and Vertical Blanking Interval (VBI) data

capture of WST data.

Fig.15 Data capture block diagram.

handbook, full pagewidth

ADC

data<7:0>

VCS

SYNC_FILTER

TTD

TTC

DATA SLICER

AND

CLOCK RECOVERY

output data to memory interface and SFRs

GSA032

ACQUISITION

FOR

WST/VPS/WSS

CVBS

SWITCH

CVBS

CVBS0

CVBS1

ACQUISITION

TIMING

SYNC

SEPARATOR

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