Recovery method and apparatus for a pipelined processing unit of

Details Recovery method and apparatus for a pipelined processing unit of Recovery method and apparatus for a pipelined processing unit of

1990-10-05

1993-03-09

Canney, Vincent P.

Excavating

371 12, G06F 1100

Patent

active

051931818

ABSTRACT:
The pipelined central processing system (CSS) units of a multiprocessor system are tightly coupled to connect in common to a system bus for sharing main memory and input/output controllers/devices. The CSS includes several circuit boards for the different VLSI circuit chip pipelined stages and associated control circuits in addition to the bus interface unit (BIU) circuits. Each board includes one or more unusual event (UEV) detector circuits for signaling when the behavior of a stage is abnormal. The UEV fault signals from each board are collected by the BIU board. When a UEV fault is detected, the BIU board circuits prevent any further communications with the system bus and broadcasts the UEV fault signal to the other boards causing the different pipelined stages to emulate the completion of the instructions within the pipeline thereby flushing it. It is thereafter placed in a nonpipelined mode. Control circuits execute a UEV handler microcode routine which reads the contents of syndrome registers included on each board containing the UEV indicator states in addition to error signals into register file working locations. The UEV signal is then cleared enabling the BIU to resume communications with the sytem bus.

REFERENCES:
patent: 4833599 (1989-05-01), Colwell et al.
Logic Design for Dynamic and Interactive Recovery by W. C. Carter, D. C. Jessep, A. B. Wadia, P. R. Schneider & W. G. Bouricius, IEEE Transactions on Computers, vol. C-20, No. 11, Nov. 1971, pp. 1300-1305.

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