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User’s Manual for Advantech SOM-A2558 series module V1.00
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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. 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
N.C.
-
N.C. just float this pin.
-
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
memory block. About detail
description, please reference
“SOM-A255x series Memory and
Interrupt Map”
.
Pull high
with
100Kohm
B48 nBUF_CS5
O
Static chip selects. Chip selects to
static memory devices such as ROM
and Flash. Individually
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 for SM501 on
SOM-A2552 & SOM-A255F series. If
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. Notifies
the DMA Controller that an external
device requires a DMA transaction. If
user wants to design a controller in
Pull low
with 1Kohm
