Rockwell Automation 2727-MRSDK MobileView Terminals Software Development Kit User Manual - Manual (Page 8)

Publication 2727-UM004B-EN-P - February 2004
1-2 Introduction to the MobileView SDK
devices with a shared data ready signal. In addition, the SA-1110
provides system support logic, multiple serial communication
channels, a color/gray scale LCD controller, PCMCIA support, and
general-purpose I/O ports.
Memory Devices
Flash Device
There is a flash part (32 MB to 64 MB) that emulates a disk device.
The flash is partitioned to several logical storage areas. One partition
provides non-volatile storage for Windows CE operating system
image. Another partition is used to store the backup of the registry.
One partition is used for the boot code. The last partition supports a
FAT 16 (DOS compatible) file system, in which programs and data can
be stored.
DRAM
The MT/G750 models have two possible memory configurations:
16 MB DRAM/32 MB Flash and 64 MB DRAM/64 MB Flash.
The Operating System uses part of the RAM for a RAMDISK and the
other part for normal system memory. The RAMDISK portion is
known as the Object Store and provides specialized storage for the
Windows CE Registry and Windows CE system databases. The
Windows CE Control Panel System Properties tool has a slider control
that allows a user to determine how the RAM is allocated between
RAMDISK Storage and system memory. The slider control is factory set
for a 50/50 split. Application programs can control RAM allocation
with the Windows CE system call SetSystemMemoryDivision (see
Microsoft’s documentation of the CE API for details).
Interfaces
Real Time Clock
The SA-1110 uses on-chip oscillators and PLLs for clock generation.
The real-time clock and trim logic run off the 32.768 kHz crystal and
provide accuracy of 5 seconds/month. The real-time clock is not
battery backed and will reset when power is cycled.