Advantech RISC Module SOM-A2552, User Manual, Page: 26 / 40

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User’s Manual for Advantech SOM-A2552 series module V1.00
26
A1 ADDR15 O SoC PXA255 system address 15 No pulling
B2 ADDR14 O SoC PXA255 system address 14 No pulling
A2 ADDR13 O SoC PXA255 system address 13 No pulling
B3 ADDR12 O SoC PXA255 system address 12 No pulling
A3 ADDR11 O SoC PXA255 system address 11 No pulling
B4 ADDR10 O SoC PXA255 system address 10 No pulling
A4 ADDR9 O SoC PXA255 system address 9 No pulling
B5 ADDR8 O SoC PXA255 system address 8 No pulling
A5 ADDR24 O SoC PXA255 system address 24 No pulling
B6 ADDR25 O SoC PXA255 system address 25 No pulling
A6 nBUF_OE O
Memory output enable pin. Connect
to the output enables of memory
devices to control data bus drivers.
No pulling
B7 ADDR20 O SoC PXA255 system address 20 No pulling
A7 nBUF_WE O
Memory write enable. Connect to the
write
enables of memory devices.
No pulling
B8 ADDR22 O SoC PXA255 system address 22 No pulling
A8
BUF_RD_nW
R
O
Read/Write for static interface.
Signals that the current transaction
is a read or write.
No pulling
B9 GND P Ground -
A9 BUF_RDY I
Variable Latency I/O Ready pin.
Notifies the memory controller when
an external bus device is ready to
transfer data.
Pull high
with
100Kohm
B10 DATA15 IO SoC PXA255 system data 15 No pulling
A10 DATA14 IO SoC PXA255 system data 14 No pulling
B11 DATA13 IO SoC PXA255 system data 13 No pulling
A11 DATA12 IO SoC PXA255 system data 12 No pulling
B12 DATA11 IO SoC PXA255 system data 11 No pulling
A12 DATA10 IO SoC PXA255 system data 10 No pulling
B13 DATA9 IO SoC PXA255 system data 9 No pulling
A13 DATA8 IO SoC PXA255 system data 8 No pulling
B14 DATA31 IO SoC PXA255 system data 31 No pulling
A14 DATA30 IO SoC PXA255 system data 30 No pulling
B15 DATA29 IO SoC PXA255 system data 29 No pulling
A15 DATA28 IO SoC PXA255 system data 28 No pulling
B16 DATA27 IO SoC PXA255 system data 27 No pulling
A16 DATA26 IO SoC PXA255 system data 26 No pulling
B17 DATA25 IO SoC PXA255 system data 25 No pulling
A17 DATA24 IO SoC PXA255 system data 24 No pulling
B18
nBUF_SDRA
S
O
SDRAM RAS. Connect to the row
address strobe (RAS) pins for all
banks of SDRAM.
No pulling
A18
nBUF_SDCS
0
O
SDRAM CS for bank 0. Connect to
the chip select (CS) pin for SDRAM.
For the PXA255 processor
nBUF_SDCS0 can be Hi-Z.
No pulling