Advantech RISC Module SOM-A2552 - Manual (Page 30)

Your ePlatform Partner
User’s Manual for Advantech SOM-A2552 series module V1.00
30
B44 C954_IRQ I
Advantech default function is used
as external 16C954 solution IC IRQ.
The pin directly connects to PXA255
GPIO32 (A16 pin). If user doesn’t
design 16C950 on CSB to expand
COM function, user could use this
pin as GPIO.
No pulling
A44 PXA_GP81 IO
GPIO pin. The pin directly connects
to PXA255 GPIO81 (F16 pin). This
GPIO pin is available for user to use.
No pulling
B45 PXA_GP82 IO
GPIO pin. The pin directly connects
to PXA255 GPIO82 (E16 pin). This
GPIO pin is available for user to use.
No pulling
A45 PXA_GP83 IO
GPIO pin. The pin directly connects
to PXA255 GPIO83 (E15 pin). This
GPIO pin is available for user to use.
No pulling
B46 PXA_GP84 IO
GPIO pin. The pin directly connects
to PXA255 GPIO84 (D16 pin). This
GPIO pin is available for user to use.
No pulling
A46 nBUF_CS1 O
Static chip selects. Chip selects to
static memory devices such as ROM
and Flash. Individually
programmable in the memory
configuration registers. nBUF_CS1
can be used with variable latency I/O
devices. Advantech default uses this
pin as storage flash chip select pin. If
no special application, Advantech
strongly suggest user to open this
pin in CSB.
Pull high
with
100Kohm
B47 nBUF_CS4 O
Static chip selects. Chip selects to
static memory devices such as ROM
and Flash. Individually. nBUF_CS4
can be used with variable latency I/O
devices.
Advantech default use this pin as
companion chip chip select pin.
nBUF_CS4 pin is used for
EVA-C210 on SOM-A255F &
SOM-A2552 series. If no special
application, Advantech strongly
suggest user to open this pin in CSB.
Pull high
with
100Kohm
A47 nBUF_CS3 O
Static chip selects. Chip selects to
static memory devices such as ROM
and Flash. Individually
programmable in the memory
configuration registers. nBUF_CS3
can be used with variable latency I/O
devices.
Advantech uses the pin as I/O
Pull high
with
100Kohm