saa569x NXP Semiconductors, saa569x Datasheet - Page 55

• Manufacturer Part Number: saa569x
• Description: Enhanced Tv Microcontrollers With On-screen Display Osd
• Manufacturer: NXP Semiconductors

Philips Semiconductors
22 DATA CAPTURE
The Data Capture section (see Fig.17) takes in the analog
Composite Video and Blanking Signal (CVBS), and
extracts the required data from it in the digital domain. The
data is then decoded and stored in memory. The first stage
converts the analog CVBS signal to digital form, using
ADC sampling at 12 MHz. Data and clock recovery is then
performed by a Multi-rate Video Input Processor (MulVIP).
Next, the following types of data are extracted: WST
Teletext (625/525), VPS, Closed Caption (CC) and WSS.
The extracted data is stored in either memory (DRAM) via
the Memory Interface or in SFR locations.
22.1
2002 May 06
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 line 21 data service (Closed Caption)
Enhanced TV microcontrollers with
On-Screen Display (OSD)
Data Capture features
memory interface
ACQUISITION
output data to
WST/VPS
FOR
CLOCK RECOVERY
TTC
DATA SLICER
Fig.17 Data Capture block diagram.
ADC
AND
data < 7:0 >
output data to SFRs
TTD
ACQUISITION
CC/WSS
CVBS0
FOR
SWITCH
CVBS
CVBS
55
CVBS1
Data Capture for VPS data (PDC system A)
Data Capture for 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 12 pages stored on-chip
Inventory of transmitted Teletext pages stored in the
Transmitted Page Table and Subtitle Page Table
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 VBI Data Capture of WST data.
ACQUISITION
SEPARATOR
TIMING
SYNC
MBK963
VCS
SYNC_FILTER
SAA567x; SAA569x
Objective specification