Microprocessor system with extended arithmetic logic unit
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United States of America Patent
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Nov 28, 1989
Grant Date -
N/A
app pub date -
Sep 26, 1986
filing date -
Sep 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microprocessor for processing operand bits has a 16 bit primary arithmetic logic unit (ALU) and shifter and a 24 bit auxiliary ALU and shifter operating in conjunction with the primary ALU. Some of the total number of operand bits are loaded into the auxiliary ALU and processed therein in advance of the processing of bits in the primary ALU. This permits a 16 bit microprocessor to perform operations with 32 bit or 48 bit operands without any performance penalties and without requiring an increase in the microcode utilized. The invention is particularly useful and valuable in such operations as multiplication and division operations, that are of a highly repetitive nature, and for all floating point operations.
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