Advantech RISC SOM-A2558 - Manual (Page 10)

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User’s Manual for Advantech SOM-A2558 series module V1.00
10
USB Spec. Rev. 1.1
- PCI Bus Controller (FPCI) which is compliant with PCI Spec. Rev. 2.2
- One port Ethernet 10/100 MAC Controller
- Interrupt Controller
- Power Management Unit with Normal, Sleep, Deep Sleep mode and
Power-off mode.
- 3.3V power supply with 3V/5V tolerant
- 256 BGA package
System Memory
SOM-A2558 SDRAM can be configured as 4/8/16/32/64/128/256MB.
Users can base on their requirement to reconfigure the SDRAM size.
There are two functions Flash on SOM-A2558 series. One is Boot Flash,
the other is Storage Flash.
Boot Flash is 1MB NOR flash. In standard SOM-A2558 series product,
Advantech will pre-install the WinCE bootloader in it.
Storage Flash is used to save image & user APs. Storage Flash size is
also reconfigurable. The Storage Flash is M-system Flash. Storage Flash size
could be 0/16/32/64 MB. SOM-A2558 series have Multiple boot options
through the on-board Flash or Compact Flash Card (CFC) for easy maintain
and cost saving. If Storage Flash is 0MB that means user should put the image
in Compact Flash Card.
CPLD
SOM-A2558 series have one CPLD on board. The CPLD take charges of
the following function:
l System memory assignments
l I/O control
l RTC control
Base on Advantech policy, Advantech won’t release the CPLD code to
user. In fact, when user designs their own target carrier board, they don’t need
to know the CPLD code. Advantech will release memory map of available
memory block and available GPIOs. These are fully enough to users to
develop their own carrier board.