Microcommand function switching circuit
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United States of America Patent
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-
Jan 2, 1996
Grant Date -
N/A
app pub date -
Apr 8, 1992
filing date -
Apr 8, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To facilitate the expansion and addition of instruction functions and to reduce development costs and time for products comprising new functions, the microaddress and mask address of a microinstruction are compared by a microaddress comparing circuit. When they correspond, an extended micropointer for generating an extended microaddress is selected by a pointer selecting circuit so as to access extended microinstruction memory in place of the micropointer and to exchange the function of a microinstruction specified by a microaddress with the function of an extended microinstruction.
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