G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.71
G06F 9/22 (2006.01) G06F 9/26 (2006.01) G06F 9/38 (2006.01)
Patent
CA 1121064
ABSTRACT OF THE DISCLOSURE A microprogrammed pipeline data processing unit in- cludes a first control store, a second control store and 2 plurality of hardware sequence control circuits. The first control store includes a plurality of storage locations, each location for storing an address field and a control se- quence field for each program instruction required to be executed by the processing unit. The second control store includes a plurality of groups of storage locations, each group storing microinstruction required for executing at least a portion of at least one program instruction. Each sequence includes at least one microinstruction which con- tains a restart field coded to specify the conditions under which the hardware sequence circuits continue instruction execution. For each program instruction which can not be executed by the plurality of hardware sequence circuits in a pipeline mode, the control sequence field is coded to in- clude a predetermined bit pattern. Then decoded, the hard- ware sequence circuits is conditioned to enter an escape state enabling control to be transferred to a sequence specified by the address field. Instruction execution pro- ceeds under microprogram control while the hardware sequence circuits remain in the same state. Upon the decoding of a microinstruction containing a restart field, the hardware sequence circuits are switched from the escape state to a state which enables the continuing of hardware instruction execution in a pipeline mode. -1-
315934
Honeywell Information Systems Inc.
Smart & Biggar
LandOfFree
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