User’s Manual for Advantech SOM-A2558 series module V1.00
to PXA255 GPIO82 (E16 pin). This
GPIO pin is available for user to use.
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.
static memory devices such as ROM
a
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
pin in CSB.
Pull high
with
100Kohm
B47
N.C. - N.C. just float this pin. -
A47
nBUF_CS3 O
Static chip selects.
static memory devices such as ROM
and Flash. Individually
programmable in the memory
configuration registers. nBUF_
can be used with variable latency I/O
devices.
Advantech uses the pin as I/O
memory block. About detail
description, please reference
“SOM-
Interrupt Map”.
Pull high
with
100Kohm
B48
nBUF_CS5 O
Static chip selects. Chip selects
static memory devices such as ROM
programmable in the memory
configuration registers. nBUF_CS5
can be used with variable latency I/O
devices.
Advantech default uses the pin as
display chip chip select pin.
nBUF_CS4 pin is used f
SOM-A2552 & SOM-
no special application, Advantech
strongly suggest user to open this
pin in CSB.
Pull high
with
100Kohm
A48
DMA_REQ1 I
Channel 1 DMA Request.
the DMA Controller that an external
device requires a DMA t
user wants to design a controller in
Pull low
with 1Kohm
