adv7188 Analog Devices, Inc., adv7188 Datasheet - Page 53

• Manufacturer Part Number: adv7188
• Description: Multiformat Sdtv Video Decoder With Fast Switch Overlay Support
• Manufacturer: Analog Devices, Inc.

PFTOGSIGN, PAL Field Toggle Sign, Address 0xEA [5]
0—Delays the field transition. Set for manual programming.
1 (default)—Advances the field transition. Not recommended
for user programming.
PFTOG, PAL Field Toggle, Address 0xEA [4:0]
The default value of PFTOG is 00011, indicating the PAL field
toggle position.
For all NTSC/PAL field timing controls, the F bit in the AV code
and the field signal on the FIELD/DE pin are modified.
SYNC PROCESSING
The ADV7188 has two additional sync processing blocks that
postprocess the raw synchronization information extracted
from the digitized input video. If desired, the blocks can be
disabled via the following two I
ENHSPLL, Enable Hsync Processor, Address 0x01 [6]
The hsync processor is designed to filter incoming hsyncs that
have been corrupted by noise; therefore, it improves the per-
formance of the ADV7188 for video signals with stable time
bases but poor SNR.
0—Disables the hsync processor.
1 (default)—Enables the hsync processor.
NOT VALID FOR USER
PROGRAMMING
ADVANCE TOGGLE OF
FIELD BY PTOG[4:0]
PFTOGDELO
ADDITIONAL
DELAY BY
1 LINE
YES
1
Figure 36. PAL F Toggle
1
0
ODD FIELD?
PFTOGSIGN
2
C bits.
TOGGLE
FIELD
0
FIELD BY PFTOG[4:0]
DELAY TOGGLE OF
ADDITIONAL
PFTOGDELE
DELAY BY
0
1 LINE
NO
1
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ENVSPROC, Enable Vsync Processor, Address 0x01 [3]
This block provides extra filtering of the detected vsyncs to
improve vertical lock.
0—Disables the vsync processor.
1 (default)—Enables the vsync processor.
VBI DATA DECODE
There are two VBI data slicers on the ADV7188. The first is
called the VBI data processor (VDP), and the second is called
the VBI System 2.
The VDP can slice both low bandwidth standards and high
bandwidth standards, such as teletext. VBI System 2 can slice
low data rate VBI standards only.
The VDP is capable of slicing multiple VBI data standards on
SD video. It decodes the VBI data on the incoming CVBS and
Y/C or YUV data. The decoded results are available as ancillary
data in the output 656 data stream. For low data rate VBI standards
such as CC/WSS/CGMS, the user can read the decoded data
bytes from I
decoded by the VDP are shown in Table 64 and Table 65.
Table 64. PAL
Feature
Teletext System A or C or D
Teletext System B/WST
VPS (Video Programming System)
VITC (Vertical Interval Time Codes)
WSS (Wide-Screen Signaling)
CC (Closed Captioning)
Table 65. NTSC
Feature
Teletext System B and D
Teletext System C/NABTS
VITC (Vertical Interval Time Codes)
CGMS (Copy Generation
Gemstar
CC (Closed Captioning)
The VBI data standard that the VDP decodes on a particular
line of incoming video has been set by default, as described in
Table 66. This can be overridden manually, and any VBI data
can be decoded on any line. The details of manual program-
ming are described in Table 67 and Table 68.
VDP Default Configuration
The VDP can decode different VBI data standards on a line-to-
line basis. The various standards supported by default on different
lines of VBI are explained in Table 66.
Management System)
2
C registers. The VBI data standards that can be
Standard
ITU-R BT.653
ITU-R BT.653/EIA-516
–
EIA-J CPR-1204/IEC 61880
–
EIA-608
Standard
ITU-R BT.653
ITU-R BT.653
ETSI EN 300 231 V1.3.1
–
BT.1119-1/ETSI EN 300 294
–
ADV7188