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C.2.4 Reset Generator
The CPU Card uses a reset generator, U4, to reset the Rabbit 2000 microprocessor when
the voltage drops below the voltage necessary for reliable operation. The reset occurs
between 4.50 V and 4.75 V, typically 4.63 V. The reset can be initiated either externally or
by a watchdog timeout ( WDTOUT ) on the Rabbit 2000 microprocessor.
+5 V
C9
10 nF
R10
100 k W
U4
RESET
GENERATOR
R16
10 k W
RESET
WDTOUT
U2:B
EXT
RESET
Figure C-3. Reset Generator
NOTE: The Dynamic C function chkWDTO is not able to detect whether a watchdog
timeout has occurred on the SR9100 series of CPU cards. The GCSR status bits are
read and stored by the BIOS, and the reset status bit would normally change once a
reset has occurred. However, since WDTOUT is tied to the reset generator, a watchdog
timeout forces a hardware reset, followed by the BIOS reading and storing the status
bits corresponding to power-up or reset.
User ’s Manual
169
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