ADLINK PCI-7442 - Manual (Page 41)

Operation theory 29
COS detection architecture
The COS interrupt system is used in PCI-7442/7443. COS inter-
rupt occurs when the any of enabled DI line sense the status
changes either from HIGH to LOW or from LOW to HIGH. The
COS interrupt system can generate an interrupt request signal and
the software can service this request with ISR. Note that PCI-7442
has two banks (bank 0 from DI0 to DI31 and bank 1 from DI32 to
63) while PCI-7443 has four banks (bank 0 from DI0 to DI31 and
bank 1 from DI32 to 63; bank 2 from DI64 to DI95 and bank 3 from
DI96 to 127). These banks are cascaded together toward the
same IRQ line via CPLD. You can use commands to know which
bank or which DI line has COS when it happens. Also, you can
use commands to disable or enable the COS function of certain DI
lines. The COS function for each is disabled by default. Refer to
Figure 3-3 for the COS detection architecture.
Figure 3-3: COS Detection Architecture
CN1
CN2