Matrox Radient eCL-DF, Установка и справочник по оборудованию, Страница: 50 / 96

50 Chapter 4: Matrox Radient eCL hardware reference
Timers
Each PSG has two timers. These timers can each generate a timer output signal
which allows you to control the exposure time and other external events related
to the video source (such as a strobe). The timer signals can be output using camera
control signals or auxiliary output signals (or auxiliary I/O signals in output
mode).
Each PSG has two 24-bit timers (Timer 1 and 2). The timers can count up to
16777215 clock ticks before resetting.
The timers can use one of the following as a clock source:
• A clock based on an external pixel clock signal.
• A clock that is internally generated. Each timer can use its PSG’s clock generator,
which can generate a single clock with a programmable frequency of 0.63 to
85 MHz. Timers can only use the clock generator of their own PSG.
• A clock from an external source. In this case, you must define the appropriate
auxiliary input signal as a timer-clock input; the timer-clock input signal must
meet the electrical specification of the auxiliary signal. The same timer-clock input
can be used to clock different timers of the same PSG.
• A clock based on another timer output of the same PSG. Timer 1 can use a clock
based on Timer 2, and Timer 2 can use a clock based on Timer 1.
• A clock based on the HSYNC or VSYNC signal generated by the PSG.
To route a timer output on an auxiliary signal, use the MIL-Lite function
MdigControl() with M_IO_SOURCE
*
+ M_AUX_IOn (or + M_CC_IOn ) set
to M_TIMERm
*
. Set up the timers using MdigControl() with M_TIMER_... .
*. As of MIL 10.