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4.5 Memory
4.5.1 SRAM
RCM3360/RCM3370 boards have 512K of program-execution fast SRAM at U11. The
program-execution SRAM is not battery-backed. There are 512K of battery-backed data
SRAM installed at U10.
4.5.2 Flash EPROM
RCM3360/RCM3370 boards also have 512K of flash EPROM.
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, use a
portion of the “user block” area to store persistent data. The functions writeUser-
Block and readUserBlock are provided for this. Refer to the Rabbit 3000 Micropro-
cessor Designer ’s Handbook for additional information.
4.5.3 NAND Flash
The RCM3360 and the RCM3370 support a removable xD-Picture Card? to store data
and Web pages. The RCM3360 and the RCM3370 both can handle up to a 128 MByte
removable xD-Picture Card , and the RCM3360 also has a 16 MByte onboard NAND
flash.
NOTE: Rabbit-based systems do not implement the xD-Picture Card ? specification for
data storage, and are neither compatible nor compliant with xD-Picture Card ? card
readers.
The NAND flash and xD-Picture Card are particularly suitable for mass-storage applica-
tions, but are generally unsuitable for direct program execution. The NAND flash differs
from parallel NOR flash (the type of flash memory used to store program code on Rabbit-
based boards and RabbitCore modules currently in production) in two respects. First, the
NAND flash requires error-correcting code (ECC) for reliability. Although NAND flash
manufacturers do guarantee that block 0 will be error-free, most manufacturers guarantee
that a new NAND flash chip will be shipped with a relatively small percentage of errors,
and will not develop more than some maximum number or percentage of errors over its
rated lifetime of up to 100,000 writes. Second, the standard NAND flash addressing
method multiplexes commands, data, and addresses on the same I/O pins, while requiring
that certain control lines must be held stable for the duration of the NAND flash access.
The software function calls provided by Z-World for the NAND flash take care of the
data-integrity and reliability attributes.
User ’s Manual
33
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