CHR71000 datasheet(34/54 Pages) AMSOSRAM

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CHR71000

Functional description

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The position of a pixel is specified as a two dimensional coordinate, written as (y,x). Pixel (0,0)

is the left-bottom pixel of the valid pixel array. The valid array extends from pixel (0,0) to pixel

(7095, 9999). Pixels (0,0) to (8,15) are addressed with address (1,1). From then on, the y-

address increases by 1 every 8 rows and the x-address by 1 every 16 columns. This means

that the address of a window with position (y,x) can be written as ( 1+(y/8) , 1+(x/16) ).

The window that is read out is defined by the four 10-bit registers reg_addr_x_start,

reg_addr_x_end, reg_addr_y_start and reg_addr_y_end (see later for more details on

programmability). The registers reg_addr_x_start and reg_addr_y_start point at the first

column and row of the window. The registers reg_addr_x_end and reg_addr_y_end point at

the first column and row that are outside the window at its right-top corner.

Example: To read out a 128(y)*64(x) window starting from pixel (24,32):

•

The window is between pixels (24,32) and (151,95)

•

The address of the first pixel of the window (24,32) maps to address (4,3)

•

The address of the first pixel outside of the window (152,96) maps to address (20,7)

•

Upload the following values:

– reg_addr_x_start = 3

– reg_addr_x_end = 7

– reg_addr_y_start = 4

– reg_addr_y_end = 20

A full frame readout (pixel (0,0) to pixel (7095,9999)) requires the following values:

•

reg_addr_x_start = 1

•

reg_addr_x_end = 626

•

reg_addr_y_start = 1

•

reg_addr_y_end = 888

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