XGS datasheet(5/53 Pages) ONSEMI

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XGS Family

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PIXEL DATA FORMAT

PIXEL ARRAY STRUCTURE

The XGS 12000 active pixel array consists of 4096

columns by 3072 rows of optically active pixels. The active

resolution of XGS 8000 and XGS 9600 can be found in

Table 1. As shown in Figures 2 through 4, the active array

is surrounded by a four−pixel wide collar of interpolation

pixels for color interpolation purposes. The entire active

array (including interpolation pixels) is isolated from the

black reference pixels by a collar of dummy pixels. The

purpose of these dummy pixels is to improve the image

uniformity within the active area. The complete pixel array,

including all dummy, black and interpolation pixels,

consists of a total of 4176 columns and 3102 rows (2190

rows for XGS 8000). The sensor’s active pixel array is

shown with the first pixel in the bottom left corner (refer to

Figures 2 through 4).

The color version of the sensor has a Bayer Color Filter

Array (CFA) placed on top of the pixels. The mapping of the

CFA with respect to the active pixel array is shown in

Figure 2 through 4.

PIXEL ARRAY READOUT

The electrical black reference lines are read out at the start

of every frame. The number of lines to be read out is

configurable through

the

lines

configuration

(configurable for each context). The ROI configurations are

processed after the black reference lines. The lines

accessible through the window configurations are limited to

the active area region, including interpolation rows. Note

that the windows are configured in logical kernel addresses.

A kernel contains four image lines and the kernel with

logical address 0 corresponds to the lines with physical

addresses:

− 15:18 for XGS 12000 and XGS 9400

− 471:474 for XGS 8000

Each window configuration consists of two parameters: a

start address and window height. The configured windows

are reordered such that the ROI with the smallest start

address is read out first. After completion of the readout of

the first ROI, the line address pointer will be initialized to the

start address of the next ROI. For overlapping windows, the

sequencer will just continue the readout. Note that the

overlapping part is read out only once.

Lines are read out from left to right and each line contains

different types of pixels. A line starts with 4 dummy pixels

followed by 24 electrical black reference pixels. The regular

image pixels are preceded and followed by 4 dummy pixels.

Dummy pixels are identical to the regular pixels, but may

deviate in performance. Therefore the dummy pixels should

be discarded. Each line is ended by another 32 black

reference pixels followed by 4 dummy pixels.

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