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3 user configurable cascaded counters – ADLINK PCI-8554 User Manual

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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