System for executing microinstruction routines by using hardware

Details System for executing microinstruction routines by using hardware System for executing microinstruction routines by using hardware

1993-02-23

1994-07-26

Lee, Thomas C.

Boots, shoes, and leggings

395775, 3642627, 3642628, 3642612, 364DIG1, G06F 928

Patent

active

053332873

ABSTRACT:
A mechanism translates a particular macroinstruction into its associated microprogram routine in a general purpose microprogrammed computer. The macroinstruction is capable of execution by either hardware or by microprogram. A table-look up approach is employed for a microprogrammed macroinstruction. The table is embedded in random-access-memory and contains entries representing the origins of various microprogram routines to execute the macroinstruction. The table entries are addressed by bits generated from the operation-code of the macroinstruction. The output of the table is used to address a single level control store containing the microprogram routines. Hardware is assembled in a single facility that is accessible by the microprogram routines to minimize the size of the microprogram routines required to execute the macroinstruction.

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