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User’s Manual for Advantech SOM-A2552 series module V1.00
29
address.
B40
nBUF_PWE O
PCMCIA write enable.
Performs
writes to PCMCIA memory and to
PCMCIA attribute space. Also used
as the write enable signal for
Variable Latency I/O.
No pulling
A40
KEYPAD_IRQ
I
GPIO pin. Advantech default
function is used as matrix Keypad
IRQ. The pin directly connects to
PXA255 GPIO2 (L13 pin). If user
doesn’t use the matrix key pad
function, use can use this pin as
GPIO pin.
No pulling
B41
N.C. - N.C. just float this pin. -
A41
PXA_GP7 IO
GPIO pin. The pin directly connects
to PXA255 GPIO7 (G15 pin). This
GPIO pin is available for user to use.
No pulling
(For
SOM-
255F
is
PXA_GPIO
7)
B42
EVA_IRQ -
Advantech use this pin to control
companion
chip as IRQ function.
The pin is not available for CSB
design of SOM-
A2558 &
SOM-A255F platform. SOM-
A2558
& SOM-
A255F user must float this
pin. This pin is directly connected to
SoC PXA255 GPIO9(F12).
-
A42
C950_485_IR
Q
I
Advantech default function is u
sed
as external 16C950 solution IC IRQ.
The pin directly connects to PXA255
GPIO10 (F7 pin). If user doesn’t
design 16C950 on CSB to expand
COM function, user could use this
pin as GPIO.
No pulling
B43
LAN1_IRQ I
Advantech default function is used
as exte
rnal LAN solution IC IRQ. The
pin directly connects to PXA255
GPIO17 (D12 pin). If user doesn’t
design the other LAN chip on CSB to
expand LAN function, user could use
this pin as GPIO.
No pulling
A43
USB_IRQ I
Advantech default function is used
as extern
al USB host solution IC
IRQ. The pin directly connects to
PXA255 GPIO27 (B9 pin). If user
doesn’t design the other USB
solution chip on CSB to expand USB
host function, user could use this pin
as GPIO.
No pulling