Microprocessor emulation system with memory mapping using variable definition and addressing of memory space
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United States of America Patent
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Jun 18, 1991
Grant Date -
N/A
app pub date -
Jun 29, 1987
filing date -
Jun 29, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A memory mapper for an emulation system suitable for a microprocessor-based system for any size microprocessor is disclosed which uses function code comparators, range comparators, and offset values for individual mapping definitions, thereby providing faster mapping of emulation memory with higher resolution and flexibility in making changes. A single mapper cell is used for implementing each separate mapping definition. The function code comparator for the mapper cell defines the type of memory, the range comparator defines the section of memory covered by the mapper definition, and a translator is used to translate the original address to a translated address by adding an offset to the original address. Original addresses which do not match any mapper cell definitions are mapped according to a default definition.
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