Control unit for a microprogrammed processor

Details Control unit for a microprogrammed processor Control unit for a microprogrammed processor

G - Physics

06

F

354/230.74

G06F 9/22 (2006.01) G06F 9/318 (2006.01)

Patent

CA 1242801

ABSTRACT OF THE INVENTION A controller of a microprocessor includes a control store for storing microinstructions. A programmable logic array (PLA), enabled when a predetermined instruction type is to be executed, translates the operand field of the macroinstruction into information bits which are used to modify the microinstruction as it is being fetched from the control store. The bits of the microinstruction which are changeable are coupled from the control store to a first input of a multiplexer. The output of the PLA is coupled to a second input of the multiplexer. A select signal for the multiplexer is generated when the predetermined instruction type is to be executed, thereby effecting a modification of the fetched microinstruction, and yielding a modification to the basic operation of the macroinstruction.

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