ADLINK PCI-8554 - Manual (Page 28)

18 • Getting Started
Figure 10: Cascaded Counter Configuration
2.9.3 User Configurable Cascaded Counters
Although by default there is only one cascaded counter, users can
configure the independent counters to be in a cascaded arrangement by
using the _SET_cntCLK_ function. . Figure 11 illustrates the user
programmable-cascaded counter. Refer to the next section for details of
the clock source options.
CLK1
COUT1
GATE1
Counter #1
8254 Chip #1
C
G
O
CLK2
COUT2
GATE2
Counter #2
C
G
O
VCC
VCC Cascaded
Counters
Output
selectable by function "_SET_cntCLK_ "
Figure 11: User Programmable Cascaded Counters