Rabbit RCM3200 Manual de usuario Pagina 34

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28 RabbitCore RCM3200
4.5 Memory
4.5.1 SRAM
The RCM3200 and the RCM3220 have 512K of program execution SRAM installed at U8.
The RCM3200 and RCM3220 data SRAM installed at U6 is 256K, and the RCM3210 has
128K data SRAM installed at U6..
4.5.2 Flash EPROM
The RCM3200 is also designed to accept 256K to 512K of flash EPROM at U7.
NOTE: Rabbit Semiconductor 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 surface-mounted
resistors exists at header JP4 on the RCM3200 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 512K 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
TN218,
Implementing a Serial Download Manager for a 256K Flash, for details.
4.5.3 Dynamic C BIOS Source Files
The Dynamic C BIOS source files handle different standard RAM and flash EPROM sizes
automatically.
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