G - Physics – 06 – F
Patent
G - Physics
06
F
354/239
G06F 7/32 (2006.01)
Patent
CA 1124886
MICROCONTROLLER FOR DISK FILES Abstract A microcontroller for controlling the bidirectional transfer of data between a control unit and a plurality of disk drives is disclosed, The microcontroller has a fixed machine cycle time for executing each instruction and is arranged to fetch the next instruction during the execution of the current instruction. The microinstructions are stored in an addressable memory and each addressed instruction is transferred to a control subsystem in response to the operation of a second subsystem whose function is to generate the address of the next instruction to be executed. A third subsystem is provided for executing the instructions which is also employed during branch type of instructions for assisting the second subsystem in generating the next address. The second subsystem also functions to supply the third subsystem during execution of certain instructions, data to be stored for use during subsequent instructions. The subsystem for executing instructions is characterized by a plurality of data sources which are selectively interconnected through the ALU to the ALU register during the input phase of a machine cycle and a plurality of data destinations which are SA978035 selectively connected to the output of the ALU register during the output phase of a machine cycle. One of these destinations is the subsystem for fetching the next instruction. The subsystem for fetching the next instruction is characterized by a plurality of partial address generators which operate selectively with the other subsystem to generate the complete address of the next instruction. The controller also employs a multilevel priority trap system for interrupting the normal sequencing of instructions in response to events occurring in the devices being controlled or events within the microprocessor. SA978035
378721
Brereton David A.
Stansbury Buddy F.
International Business Machines Corporation
Na
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