Apparatus and method for detecting errors in a pipeline data pro

Details Apparatus and method for detecting errors in a pipeline data pro Apparatus and method for detecting errors in a pipeline data pro

1989-12-08

1992-04-28

Smith, Jerry

Excavating

371 12, 395575, G06F 1100, G06F 938

Patent

active

051093812

ABSTRACT:
A pipelined data processing system comprises a series of pipeline stages through which instructions pass sequentially. If an error associated with a particular instruction (e.g. an illegal instruction) is detected, a Mayday signal is produced. This does not become active immediately. Instead it is passed down the pipeline along with the instruction that caused it, and becomes active only if that instruction attempts to terminate at the end of the pipeline. When the Mayday becomes active, it causes an interrupt to a diagnostic processor. If, on the other hand, the instruction that caused the Mayday is aborted, or does not attempt to terminate, then the Mayday is discarded and does not become active. This prevents unnecessary diagnostic actions.

REFERENCES:
patent: 4500958 (1985-02-01), Manton et al.
patent: 4500959 (1985-02-01), Kubo et al.
patent: 4583222 (1986-04-01), Fossum et al.
patent: 4757445 (1988-07-01), Zolnowsky et al.
patent: 4903264 (1990-02-01), Talgam et al.
patent: 4982402 (1991-01-01), Beaven et al.

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