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Rabbit 6000 User’s Manual
digi.com
56
Figure 5.2 Logical and Physical Memory Mapping
The Rabbit 2000 and 3000 had numerous instructions for reading and writing data to logical addresses, but
only had limited support for reading and writing data to a physical memory address. In the Rabbit 4000, a
wide range of instructions was provided to read and write to physical addresses. The same instructions can
be used to write to logical addresses. All of these instructions are available in the Rabbit 6000, as well as
new instructions for more operations using physical addresses.
The 64 KB logical memory space limitation can also be expanded by using the separate instruction and
data space mode. When this mode is enabled, address bit A16 is inverted for all data accesses in the root
and/or data segments, and the most-significant bit of the bank select bits is inverted for all data accesses in
the root and/or data segments before bank selection (physical device) occurs. These two features allow
both code and data to access separate 64 KB logical spaces instead of sharing a single space.
It is possible to protect memory in the Rabbit 6000 at three different levels—each of the memory banks
can be made read-only, physical memory can be write-protected in 64 KB blocks, and two of those 64 KB
blocks can be protected with a granularity of 4 KB. A Priority 3 interrupt will occur if a write is attempted
in one of the protected 64 KB or 4 KB blocks. In addition, it is possible to place limits around the code exe-
cution stack and generate an interrupt if a stack-related write occurs within 16 bytes of those limits.
The drive strength and slew rate can be controlled for the address bus, data bus, and memory strobes (other
than /CS1, which has fixed functionality). In addition, a 75 k
pullup or pulldown resistor can be enabled
on the data bus.
Summary of Contents for 6000
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