EVAL-ADV7183BEB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-ADV7183BEB' PDF : 104 Pages View PDF
ADV7183A
SYNC PROCESSING
The ADV7183A extracts syncs embedded in the video data
stream. There is currently no support for external HS/VS
inputs. The sync extraction has been optimized to support
imperfect video sources, for example videocassette recorders
with head switches. The actual algorithm uses a coarse
detection based on a threshold crossing followed by a more
detailed detection using an adaptive interpolation algorithm.
The raw sync information is sent to a line-length measurement
and prediction block. The output of this is then used to drive
the digital resampling section to ensure that the ADV7183A
outputs 720 active pixels per line.
The sync processing on the ADV7183A also includes two
specialized postprocessing blocks that filter and condition the
raw sync information retrieved from the digitized analog video.
• VSync Processor. This block provides extra filtering of the
detected VSyncs to give improved vertical lock.
• HSync Processor. The HSync processor is designed to filter
incoming HSyncs that have been corrupted by noise,
providing much improved performance for video signals
with stable time base but poor SNR.
VBI DATA RECOVERY
The ADV7183A can retrieve the following information from
the input video:
• Wide-screen signaling (WSS)
• Copy generation management system (CGMS)
• Closed caption (CC)
• Macrovision protection presence
• EDTV data
• Gemstar-compatible data slicing
The ADV7183A is also capable of automatically detecting the
incoming video standard with respect to color subcarrier fre-
quency, field rate, and line rate. It can configure itself to support
PAL-BGHID, PAL-M/N, PAL-combination N, NTSC-M, NTSC-
J, SECAM 50 Hz/60 Hz, NTSC4.43, and PAL60.
GENERAL SETUP
Video Standard Selection
The VID_SEL[3:0] register allows the user to force the digital
core into a specific video standard. Under normal circum-
stances, this should not be necessary. The VID_SEL[3:0] bits
default to an autodetection mode that supports PAL, NTSC,
SECAM, and variants thereof.
Refer to the Autodetection of SD Modes section for more
information on the autodetection system.
Autodetection of SD Modes
In order to guide the autodetect system, individual enable bits
are provided for each of the supported video standards. Setting
the relevant bit to 0 inhibits the standard from being detected
automatically. Instead, the system picks the closest of the
remaining enabled standards. The autodetection result can be
read back via the status registers. See the Global Status Registers
section for more information.
Table 30. VID_SEL Function
VID_SEL[3:0]
Address 0x00 [7:4] Description
0000 (default)
Autodetect (PAL BGHID) <–> NTSC J (no
pedestal), SECAM.
0001
Autodetect (PAL BGHID) <–> NTSC M
(pedestal), SECAM.
0010
Autodetect (PAL N) <–> NTSC J (no
pedestal), SECAM.
0011
Autodetect (PAL N) <–> NTSC M
(pedestal), SECAM.
0100
NTSC J (1)
0101
NTSC M (1).
0110
PAL 60.
0111
NTSC 4.43 (1).
1000
PAL BGHID.
1001
PAL N ( = PAL BGHID (with pedestal)).
1010
PAL M (without pedestal).
1011
PAL M.
1100
PAL combination N.
1101
PAL combination N (with pedestal).
1110
SECAM.
1111
SECAM (with pedestal).
Rev. B | Page 22 of 104
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