Acquisition and Camera Control
Generation of Acquisition Windows
Version G.5
BitFlow, Inc.
NEO-2-9
2.4 Generation of Acquisition Windows
2.4.1 The Horizontal Active Window, HAW
The Horizontal Active Window (HAW) is a square wave that defines the portion of the
line that will be acquired horizontally. HAW can span less than the whole camera line,
if we want to acquire only a portion of that line. The size of the HAW is determined by
a single number, the Active Clocks Per Line (ACPL). The ACPL is defined as the num-
ber of clocks during which the HAW is active. The ACPL field is programmed in
CON10. The 17 bits define the maximum HAW as minimum 128K pixels.
The total number of pixels per line that will be acquired can be different than the
ACPL. For a dual tap camera that supplies odd-even pixels for example, the total num-
ber of pixels acquired will be twice the ACPL, as for every clock the camera supplies
two pixels. Note that the ACPL is not a function of the bits per pixel. The relationship
between the number of pixels per line and the number of clocks per line is controlled
by the firmware currently downloaded to the board. The FORMAT register will indi-
cate which firmware is currently downloaded. Each tap configuration requires a differ-
ent firmware file be downloaded. The correct firmware is automatically downloaded
based on the information contained in the camera configuration file.
The size of the HAW is on an arbitrary boundary. The start in time of the HAW can
come from two sources, depending on the setting of the HAW_START bit:
The HSTART bit in the HCTAB, if HAW_START = 1.
The start of LEN, if HAW_START = 0.
In both modes, the start of the HAW can be delayed 0-7 clocks relative to the start
function (HSTART or LEN). This is done by the TRIM bits in CON9.
In both modes, the start of the HAW can be advanced 0-7 clocks relative to the start
function (HSTART or LEN). This is done by the DELAY bits in CON14.
The HCTAB is the Horizontal Control Table that generates the HSTART, see section on
CTABs.
Figure 2-4 shows the controls that generate the HAW.
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