ASX340AT Datasheet, PDF (23/75 Pages) ON Semiconductor – Color CMOS NTSC/PAL Digital Image

ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor
Sensor Pixel Array
YUV-to-RGB/YUV Conversion and Output Formatting
The YUV data stream emerging from the colorpipe can either exit the color pipeline as-is
or be converted before exit to an alternative YUV or RGB data format.
Output Format and Timing
YUV/RGB Data Ordering
The ASX340AT supports swapping YCbCr mode, as illustrated in Table 11.
Table 11:
YCbCr Output Data Ordering
Mode
Data Sequence
Default (no swap)
Swapped CbCr
Swapped YC
Swapped CbCr, YC
Cb_i
Y_i
Cr_i
Y_i+1
Cr_i
Y_i
Cb_i
Y_i+1
Y_i
Cb_i
Y_i+1
Cr_i
Y_i
Cr_i
Y_i+1
Cb_i
The RGB output data ordering in default mode is shown in Table 12. The odd and even
bytes are swapped when luma/chroma swap is enabled. R and B channels are bit-wise
swapped when chroma swap is enabled.
Table 12: RGB Ordering in Default Mode
Mode (Swap Disabled)
565RGB
555RGB
444xRGB
x444RGB
Byte
Odd
Even
Odd
Even
Odd
Even
Odd
Even
D₇D₆D₅D₄D₃D₂D₁D₀
R₇R₆R₅R₄R₃G₇G₆G₅
G₄G₃G₂B₇B₆B₅B₄B₃
0 R₇R₆R₅R₄R₃G₇G₆
G₅G₄G₃B₇B₆B₅B₄B₃
R₇R₆R₅R₄G₇G₆G₅G₄
B₇B₆B₅B₄ 0 0 0 0
0 0 0 0 R₇R₆R₅R₄
G₇G₆G₅G₄B₇B₆B₅B₄
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 13.
Table 13: 2-Byte Bayer Format
Readout Formats
Byte
Odd bytes
Even bytes
Bits Used
8 data bits
2 data bits + 6 unused bits
Progressive format is used for raw Bayer output.
Bit Sequence
D₉D₈D₇D₆D₅D₄D₃D₂
0 0 0 0 0 0 D₁D₀
ASX340AT/D Rev. H, 8/15 EN
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