SAA5500PS Philips Semiconductors, SAA5500PS Datasheet - Page 42

• Manufacturer Part Number: SAA5500PS
• Description: Standard TV Microcontrollers with On-Screen Display(OSD)
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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
1999 Oct 27
handbook, full pagewidth
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)
Standard TV microcontrollers with
On-Screen Display (OSD)
Data Capture features
output data to memory interface and SFRs
CLOCK RECOVERY
TTC
WST/VPS/WSS
DATA SLICER
ACQUISITION
Fig.15 Data capture block diagram.
ADC
AND
FOR
data < 7:0 >
TTD
CVBS0
SWITCH
CVBS
CVBS
42
CVBS1
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.
ACQUISITION
SEPARATOR
GSA032
TIMING
SYNC
VCS
SYNC_FILTER
Preliminary specification
SAA55xx