User Manual

Asset-Link 250 User Manual July 19, 2004
970-00047 Rev. 1.2
CSI Wireless©2004 Specifications subject to change without notice Page 2-4
• GPS receiver status (antenna feed line fault, not detected, number of satellite
vehicles tracking)
• GPS tracking for each satellite vehicle (azimuth, elevation, average
carrier/noise, ephemeris available, code locked, carrier pull-in, acquisition
failed, bit synchronization, sub-frame synchronization).
In both the Active and Full-Power mode, the GPS position is continuously logged to
non-volatile memory along with other Asset-Link status parameters. This information
is logged every second to nvSRAM, and saved to Flash when the system is powered
down.
2.4 Function Control Processor
The FCP module in the ARM processor of the GPS receiver is the central intelligence
of the Asset-Link unit. The FCP module manages the cellular and GSM module
connection and controls the application. The application is controlled by the
navigation solution and performs exception handling (such as input signal and Geo-
fence exceptions) based on schedules and actions.
2.4.1 Non-Volatile Memory
Cellular Module SRAM 16 Kbit
Cellular Module FLASH 512 Kbit
FCP nvSRAM 512 Kbit
FCP FLASH 32 Mbit
The FCP code consumes less than 20% of the available code space and allows
sufficient room for the complete download of new image in the case of an OTAP.
About 256K of space is reserved for constrain regions and geopolitical boundaries.
The balance of the flash memory (about 16M) is used for message and record storage.
The Asset-Link FCP uses two types of non-volatile memory storage: parallel
nvSRAM memory, and FLASH memory.
Memory Type Life Expectancy
ARM nvSRAM Infinite Write Cycles to SRAM
1M Store Cycles to nonvolatile elements
ARM FLASH 1M Erase & Program Cycles
The Cellular and GSM transceivers have separate Serial SRAM memory, and FLASH
memory.
Memory Type Life Expectancy
Serial SRAM 1M Write Cycles
FLASH 10k Cycles