Rabbit 6000 User’s Manual
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55
Figure 5.1 Mapping Rabbit 6000 Physical Memory Space
Either one or both of the two most significant address bits (which are used to select the quadrant) can be
inverted, providing the ability to bank-switch other pages from a larger memory device into the same
memory bank.
Code is executed in the 64 KB logical memory space, which is divided into four segments: root, data,
stack, and XMEM. The root segment is mapped directly to physical address 0x000000, while the data and
stack segments can be mapped to 4 KB boundaries anywhere in the physical space. The boundaries
between the root and data segments and the data and stack segments can be adjusted in 4 KB blocks as
well.
The XMEM segment is a fixed 8 KB, and points to a physical memory address block specified in the
LXPC register. It is possible to run code in the XMEM window, providing an easy means of storing and
executing code beyond the 64 KB logical memory space. Special call and return instructions to physical
addresses are provided that automatically update the LXPC register as necessary.
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