Advantech RISC SOM-A2558 User Manual
Page 33
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User’s Manual for Advantech SOM-A2558 series module V1.00
33
CSB with DMA mode, please check
with
first.
If use doesn’t want to use this pin as
DMA_REQ, use could use the pin as
GPIO. The pin connects to SoC
PXA255 GPIO19.
B49 MBREQ
I
Memory Controller alternate bus
master request. Allows an external
device to request the system bus
from the Memory Controller. If user
wants to design a controller in CSB
with this pin function, please check
with
first.
If use doesn’t want to use this pin as
DMA_REQ, use could use the pin as
GPIO. The pin connects to SoC
PXA255 GPIO14.
Pull low
with 1Kohm
A49 DMA_ACK1
O
Channel 1 DMA acknowledge.
Notifies an external device that it has
been acknowledged the DMA
controller. If user wants to design a
controller in CSB with DMA mode,
please check with
first.
If use doesn’t want to use this pin as
DMA_ACK, use could use the pin as
GPIO. The pin connects to SoC
PXA255 GPIO22.
No pulling
B50 MBGNT
O
Memory Controller grant. Notifies an
external device that it has been
granted the system bus. If user
wants to design a controller in CSB
with this pin function, please check
with
first.
If use doesn’t want to use this pin as
MBGNT, use could use the pin as
GPIO. The pin connects to SoC
PXA255 GPIO13.
Pull low
with 1Kohm
A50 3M6864
O
3.6864 MHz clock. Output from
3.6864 MHz oscillator.
No pulling
¦
100-pin B2B connector Pin Out Table (X3 connector for PCI, ZV port,
MMC interface and Misc. function)
Pin
No.
Signals
Typ
e
Model
Default state
B1
PCIAD0
IO PCI address/data 0
No pulling
A1
PCIAD1
IO PCI address/data 1
No pulling