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User’s Manual for Advantech SOM-A2552 series module V1.00
19
2 2.
79 nSA_SKT0_IOI
S16
I IO Select 16. (input) Acknowledge
from the PCMCIA card that the
current address is a valid 16 bit
wide I/O address.
Pull high with
10Kohm
80 SA_SKT0_VCC
P PCMCIA/CF slot 0 power pin. Powered
81 nSA_SKT1_IOI
S16
I PCMCIA/CF slot 0 IO Select 16.
Acknowledge from the PCMCIA
card that the current address is a
valid 16 bit wide I/O address.
Pull high with
10Kohm
82 nSA_PWR_ON
I
System suspend/wakeup input pin.
Falling edge triggered.
Pull high with
10Kohm
83 nBATT_FALT
I Main Battery Fault. Signals that
main battery is low or removed.
Assertion causes PXA255
processor to enter sleep mode or
force an Imprecise Data Exc
eption,
which cannot be masked. PXA255
processor will not recognize a
wakeup event while this signal is
asserted. Minimum assertion time
for nBATT_FAULT is 1 ms.
Pull high with
100Kohm
84 nSW_RESET
I System software reset input pin.
Falling edge triggered.
Pull high with
10Kohm
85 nVDD_FALT I VDD Fault. Signals that the main
power source is going out of
regulation. nVDD_FAULT causes
the PXA255 processor to enter
sleep mode or force an Imprecise
Data Exception, which cannot be
masked. nVDD_FAULT is ignored
after a wakeup event until the
power supply timer completes
(approximately 10 ms). Minimum
assertion time for nVDD_FAULT is
1 ms.
Pull high with
100Kohm
86 nRESET_OUT
O
Reset Out. Asserted when
nRESET is asserted and deasserts
after nRESET is deasserted but
before the first instruction fetch.
nRESET_OUT is also asserted for
“soft” reset events: sleep,
watchdog reset, or GPIO reset.
No pulling
87 GND P Ground -
88 PWR_EN
O
Power Enable for the power
supply. (output) When negated, it
signals the power supply to
remove power to the core because
the system is entering sleep mode.
Pull high with
100Kohm
89 BAT_VCC P 3.0V li-
ion coin battery positive
No pulling