ADLINK PXI-2006 - Manual (Page 64)

54 Operation Theory
4-24 il-lustrates the operation where initial count = 0, count-up
mode.
Figure 4-24: Mode 2 Operation
Mode 3: Single Pulse-width Measurement
In this mode the counter counts the pulse-width of the signal on
GPTC_GATE in terms of GPTC_CLK. Initial count can be
loaded from software. After the software-start, the counter
counts the number of active edges on GPTC_CLK when
GPTC_GATE is in its active state. After the completion of the
pulse-width interval on GPTC_GATE, GPTC_OUT out-puts
high and then current count value can be read-back by soft-
ware. Figure 4-25 illustrates the operation where initial count =
0, count-up mode.
Figure 4-25: Mode 3 Operation
Mode 4: Single Gated Pulse Generation
This mode generates a single pulse with programmable delay
and pro-grammable pulse-width following the software-start.
The two programma-ble parameters could be specified in
terms of periods of the GPTC_CLK input by software.