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2.21 Watchdog timer configuration
An on-board watchdog timer reduces the chance of disruptions which
EMP (electro-magnetic pulse) interference can cause. This is an invalu-
able protective device for standalone or unmanned applications. Setup
involves one jumper and running the control software (refer to Appendix
A).
2.21.1 Watchdog timer action (pin 7-10 of JP1)
When the watchdog timer activates (CPU processing has come to a halt),
it can reset the system or generate an interrupt on IRQ11. This can be set
via setting JP1 as shown below:
Table 2.6: JP1 Watchdog timer action
Pins
7-8
9-10
* Default setting
2.22 USB connectors (CN19)
The PCM-9371 board provides up to four USB (Universal Serial Bus)
ports. This gives complete Plug and Play, and hot attach/detach for up to
127 external devices. The USB interfaces comply with USB specification
Rev. 1.1, and are fuse protected.
The USB interface is accessed through two 5 x 2-pin flat-cable connec-
tors, CN19 (USB1, 2). You will need an adapter cable if you use a stan-
dard USB connector. The adapter cable has a 5 x 2-pin connector on one
end and a USB connector on the other.
The USB interfaces can be disabled in the system BIOS setup.
System reset*
closed
open
IRQ11
open
closed
23
Chapter 2
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