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1M28 and 1M75 User's Manual
Registers 18-20 (LinLog2)
The LinLog2 time constant is implemented as a 24 bit register (registers 18-20), similar to
the exposure time. The LinLog2 time constant must always be smaller than the exposure
time.
Registers 21-23 (Frame Time)
The frame time is set by registers 21-23. This value is set in increments of the pixel clock
(35ns for 1M28 and 50ns for 1M75). The frame time is used to keep the frame rate
constant, independent of the exposure time.
exposure time. Invalid values must be prevented via software.
Register 24-31 (ROI = Region Of Interest)
The registers 24-31 are used to define the region of interest of the sensor. The coordinates
of the corners of the ROI are written and take effect at the beginning of the next frame.
Invalid values must be prevented via software. Values x
camera. For full resolution:
x
, y
0
x
, y
1
Register 32 (Line pause)
This register stores the line pause value. It is also defined in increments of the pixel clock.
Valid line pause values are between 5 and 255. Default is 8.
Register 33: Line Jump (and Pixel Jump)
This register contains the value for the interlace mode. The line counter is incremented by
this value. The lines in between are skipped.
Register 47: RAM Bank Selection
The RAM banks in the FPGA are selected with this register.
Registers 48-63: Data for 16 x 8 RAM Banks
RAM banks have been implemented for internal parameters not used constantly by state
machines.
Frame Rate Calculation
To determine the frame rate, it is easiest to calculate the frame time first. The frame rate is
the inverse of frame time.
The frame time depends on the parameters exposure time, ROI, and line pause.
For the frame time:
DALSA
PRELIMINARY
= 0, 0
0
= 1023, 1023
1
NOTE:
The frame rate sets the maximum
>x
, or y
>y
, are ignored by the
0
1
0
1
39
03-32-00525-03
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