User`s manual

User’s Manual 15
2.4 Memory
2.4.1 SRAM
The RCM3000 is designed to accept 128K to 512K of SRAM packaged in a 32-pin TSOP
or sTSOP case.
2.4.2 Flash EPROM
The RCM3000 is also designed to accept 256K to 512K of flash EPROM packaged in a
32-pin TSOP or sTSOP case.
NOTE: Z-World recommends that any customer applications should not be constrained
by the sector size of the flash EPROM since it may be necessary to change the sector
size in the future.
Writing to arbitrary flash memory addresses at run time is also discouraged. Instead,
define a “user block” area to store persistent data. The functions writeUserBlock and
readUserBlock are provided for this.
A Flash Memory Bank Select jumper configuration option based on 0 Ω surface-mounted
resistors exists at header JP1 on the RCM3000 Series RabbitCore modules. This option,
used in conjunction with some configuration macros, allows Dynamic C to compile two
different co-resident programs for the upper and lower halves of the 256K flash in such a
way that both programs start at logical address 0000. This is useful for applications that
require a resident download manager and a separate downloaded program. See Technical
Note 218, Implementing a Serial Download Manager for a 256K Flash, for details.
2.4.3 Dynamic C BIOS Source Files
The Dynamic C BIOS source files handle different standard RAM and flash EPROM sizes
automatically.