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User’s Manual for Advantech SOM-A2558 series module V1.00
29
length of the transfers t
o/from the
PXA255 processor.
100Kohm
B21
BUF_SDCLK
1
O
SDRAM Clock 1.
Connect SDCLK
[1] to the clock pins of SDRAM in
bank pairs 0/1. They are driven by
either the internal memory controller
clock, or the internal memory
controller clock div
ided by 2. At
reset, all clock pins are free running
at the divide by 2 clock speed and
may be turned off via free running
control register bits in the memory
controller. The memory controller
also provides control register bits for
clock division and deas
sertion of
each SDCLK pin. SDCLK[2:1]
control register assertion bits are
always deasserted upon reset.
No pulling
A21
BUF_SDCKE
1
O
SDRAM and/or Synchronous Static
Memory clock enable.
Connect to
the clock enable pins of SDRAM. It is
deasserted during sle
ep.
BUF_SDCKE1 is always deasserted
upon reset. The memory controller
provides control register bits for
deassertion.
No pulling
(For
SOM-
255F
is
BUF_SDC
KE1)
B22
GND P Ground -
A22
ADDR0 O SoC PXA255 system address 0 No pulling
B23
ADDR1 O SoC PXA255 system address 1 No pulling
A23
ADDR2 O SoC PXA255 system address 2 No pulling
B24
ADDR3 O SoC PXA255 system address 3 No pulling
A24
ADDR4 O SoC PXA255 system address 4 No pulling
B25
ADDR5 O SoC PXA255 system address 5 No pulling
A25
ADDR6 O SoC PXA255 system address 6 No pulling
B26
ADDR7 O SoC PXA255 system address 7 No pulling
A26
ADDR16 O SoC PXA255 system address 16 No pulling
B27
ADDR17 O SoC PXA255 system address 17 No pulling
A27
ADDR18 O SoC PXA255 system address 18 No pulling
B28
ADDR19 O SoC PXA255 system address 19 No pulling
A28
ADDR21 O SoC PXA255 system address 21 No pulling
B29
ADDR23 O SoC PXA255 system address 23 No pulling
A29
DATA0 IO SoC PXA255 system data 0 No pulling
B30
DATA1 IO SoC PXA255 system data 1 No pulling
A30
DATA2 IO SoC PXA255 system data 2 No pulling
B31
DATA3 IO SoC PXA255 system data 3 No pulling
A31
DATA4 IO SoC PXA255 system data 4 No pulling
B32
DATA5 IO SoC PXA255 system data 5 No pulling
A32
DATA6 IO SoC PXA255 system data 6 No pulling
B33
DATA7 IO SoC PXA255 system data 7 No pulling