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User’s Manual for Advantech SOM-A2552 series module V1.00

 

 

 

memory

block.

About

detail

 

 

 

 

description,

please

 

reference

 

 

 

 

“SOM-A255x series

 

Memory and

 

 

 

 

Interrupt Map”.

 

 

 

 

 

 

 

 

 

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

Pull high

 

 

 

devices.

 

 

 

 

 

 

B48

nBUF_CS5

O

 

 

 

 

 

 

with

Advantech default uses the pin as

 

 

 

100Kohm

 

 

 

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.

 

 

 

 

 

 

 

 

 

Channel 1 DMA Request. Notifies

 

 

 

 

the DMA Controller that an external

 

 

 

 

device requires a DMA transaction. If

 

 

 

 

user wants to design a controller in

 

A48

DMA_REQ1

I

CSB with DMA mode, please check

Pull low

with ae.risc@advantech.com.tw first.

with 1Kohm

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

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

Pull low

B49

MBREQ

I

with this pin function, please check

with 1Kohm

 

 

 

with ae.risc@advantech.com.tw 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.

 

 

 

 

 

 

 

 

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,

 

A49

DMA_ACK1

O

please

 

check

 

 

with

No pulling

 

 

 

ae.risc@advantech.com.tw 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.

 

 

 

 

 

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Image 31
Advantech SOM-A2552 manual DMAREQ1, Mbreq, DMAACK1