ASX340AT datasheet(17/54 Pages) ONSEMI

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ASX340AT

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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

Bits Used

Bit Sequence

Odd bytes

8 data bits

D9D8D7D6D5D4D3D2

Even bytes

2 data bits + 6 unused bits

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

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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