![Known Limitations](/images/new-backgrounds/144763/14476345x1.webp)
Known Limitations
•RFD (onboard flash drive) is not compatible with DOS expanded memory configuration in EMM386.EXE. Use the NOEMS switch appended to the end of the EMM386 line in your config.sys to bypass EMS. Example line in config.sys: device=c:\DOS\EMM386.exe NOEMS
•The onboard flash chip has a limitation of 2,000,000 erase cycles, so swap drives or virtual memory functions should not be used.
•Only
Life Cycle Management and Calculations
The
A typical embedded application consists of reading a file, updating it, and repeating the process over and over again. The formula for calculating the number of times this may be done before the flash reaches its limit is as follows:
Number of file writes = (size of chip / size of file) * lifetime of chip
Where size of chip = 1.45MB and lifetime of chip = 2,000,000. This formula reveals the increase in lifetime provided by the wear leveling. The lifetime is increased by the ratio of the chip’s total capacity to the file size.
To calculate the number of days the chip will last, simply factor in the number of updates per day:
Lifetime in days = number of file writes / file writes per day
Page 23 |