ASX340AT_16 Datasheet, PDF (17/54 Pages) ON Semiconductor – 1/4‐inch Color CMOS NTSC/PAL Digital Image SOC

ASX340AT
Uncompressed 10-Bit Bypass Output
Raw 10-bit Bayer data from the sensor core can be output
in bypass mode in two ways:
• Using 8 data output signals (DOUT[7:0]) and
GPIO[1:0]. The GPIO signals are the least significant 2
bits of data.
• Using only 8 signals (DOUT[7:0]) and a special 8 + 2
data format, shown in Table 12.
TABLE 12. 2-BYTE BAYER FORMAT
Byte
Odd bytes
Even bytes
Bits Used
8 data bits
2 data bits + 6 unused bits
Bit Sequence
D₉D₈D₇D₆D₅D₄D₃D₂
0 0 0 0 0 0 D₁D₀
Readout Formats
Progressive format is used for raw Bayer output.
Output Formats
ITU-R BT.656 and RGB Output:
TheASX340AT can output processed video as a standard
ITU-R BT.656 (CCIR656) stream, an RGB stream, or as
unprocessed Bayer data. The ITU-R BT.656 stream contains
YCbCr 4:2:2 data with embedded synchronization codes.
This output is typically suitable for subsequent display by
standard video equipment or JPEG/MPEG compression.
Colorpipe data (pre-lens correction and overlay) can also
be output in YCbCr 4:2:2 and a variety of RGB formats in
640 by 480 progressive format in conjunction with
LINE_VALID and FRAME_VALID.
The ASX340AT can be configured to output 16-bit RGB
(565RGB), 15-bit RGB (555RGB), and two types of 12-bit
RGB (444RGB). Refer to Table 23 and Table 24 for details.
Bayer Output:
Unprocessed Bayer data are generated when bypassing
the IFP completely−that is, by simply outputting the sensor
Bayer stream as usual, using FRAME_VALID,
LINE_VALID, and PIXCLK to time the data. This mode is
called sensor bypass mode.
Output Ports
Composite Video Output:
The composite video output DAC is
external-resistor-programmable and supports both
single-ended and differential output. The DAC is driven by
the on-chip video encoder output.
Parallel Output:
Parallel output uses either 8-bit or 10-bit output. Eight-bit
output is used for ITU-R BT.656 and RGB output. Ten-bit
output is used for raw Bayer output.
Zoom Support
The ASX340AT supports zoom x1 and x2 modes, in
interlaced and progressive scan modes. The progressive
support is limited to the VGA at either 60 fps or 50 fps.
In the zoom x2 modes, the sensor is configured for QVGA
(320 x 240), and the zoom x2 window can be configured to
pan around the VGA window.
FOV Stretch Support
The ASX340AT supports the ability to control the active
“width” of the TV output line, between 692 and 720 pixels.
The hardware supports two margins, each a maximum of 14
pixels width, and has to be an even number of pixels.
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