Dalsa QuickCam User Manual page 43

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input signal. If a frequency lies between two different granularity settings, the
lowest setting will yield a better precision. The possible values are:
1 PCI clock cycles: The frequency of the input signal is between 509Hz and
4 PCI clock cycles: The frequency of the input signal is between 128Hz and
16 PCI clock cycles: The frequency of the input signal is between 32Hz and
256 PCI clock cycles: The frequency of the input signal is between 2Hz and
Multiplicator
The multiplier applied to the input frequency. The possible values are:
•
•
•
Divider
The divider applied to the input frequency. The resulting frequency is computed
as follows:
Input Selection
Indicates which label in the GPIO LUT will be associated with the rescaler. Make
sure you select an input label that is not being used for its default behavior. For
example, Q9 is used to send a trigger to pulse generator 0. If pulse generator 0 is
used in triggered mode, then it will be triggered by Q9 and cannot be used as the
input for the rescaler. The possible values are: Q3, Q7, Q8. Q9, Q10, Q11, Q16,
and Q17.
Backup Enabled
Indicates if the rescaler will use a back-up input source if its main source stops its
activity.
Backup Window
Specifies the window of time during which there can be no activity from the
main input source before the rescaler switches to the back-up source. As soon as
activity is detected, the rescaler returns to its main input source.
Backup Input
Same as the main input source
Target Frequency
Helper parameter that computes the best rescaler value of a given target
frequency.
Recommended Granularity
03-032-10187-04
33.3MHz.
8.3MHz.
2.08Mhz
130.2kHz
Frequency is multiplied by 256
Frequency is multiplied by 16
Frequency is multiplied by 4096
=
output _ frequency
input _ frequencyx multiplica
divider
QuickCam User's Manul
tor
DALSA corp.