XGS datasheet(9/53 Pages) ONSEMI

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XGS Family

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Readout Order

Frame readout starts by setting the read address to the first

row of the configured ROI. Once the row is read, the read

address is incremented and the next row is read. This cycle

continues until the last row of the ROI has been read. The

incremental addressing scheme is depicted in Figure 5.

Figure 5. Incremental Row Addressing Sequence

Subsampled Readout

During subsampled readout only a subset of the pixel

array is read out, enabling faster read out with the same field

of view but at the expense of reduced image resolution. In

order to support subsampling on both monochrome and

color sensors, XGS supports two different subsampling

schemes:

1. Read One Skip One

In this mode, one out of four pixels is selected for

readout by selecting every other line and column

in the image array. The Read−One−Skip−One

mode is depicted in Figure 6 below. This

subsampling mode does not preserve the Bayer

pattern so it is recommended for monochrome

devices only.

Figure 6. Monochrome Subsampling

(Read−1−Skip−1)

= Skip

= Read

2. Read Two Skip Two

The Read−Two−Skip−Two subsampling scheme is

recommended for color sensors as it preserves the

Bayer pattern. When using the

Read−Two−Skip−Two scheme, the sensor first

reads two rows and then skips two rows. From

each row being read, first two adjacent pixels will

be read, then two will be skipped. This readout

scheme is depicted in Figure 7.

Figure 7. Color Subsampling (Read−2−Skip−2)

= Skip

= Read

Reverse Readout

XGS supports reverse readout in the vertical (Y−)

direction. If active_config_reg.active_reversed is set to 1,

the ROIs will be read top to bottom instead of the default

(active_config_reg.active_reversed = 0) bottom to top

readout direction.

XGS Datasheet(PDF) 9 Page - ON Semiconductor

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