Method and apparatus for processing programmed input/output (PIO

Details Method and apparatus for processing programmed input/output (PIO Method and apparatus for processing programmed input/output (PIO

1996-02-15

1998-08-04

Toplu, Lucien U.

395826, 395841, 395840, G06F 928

Patent

active

057908877

ABSTRACT:
A method and apparatus are provided for processing programmed input/output (PIO) operations in a computer system. A batched list of PIO operations is stored in a buffer. Then the batched list of PIO operations is moved as a single system bus operation to an I/O bus interface unit. The I/O bus interface unit includes sequencer logic. The sequencer logic is used for executing the batched list of PIO operations and for providing an ordered sequence of PIO operations to a system I/O bus. The method and apparatus of the invention enhances the use of non-intelligent I/O adapters in a computer system by reducing the overhead of system PIO operations. Also the correctly ordered sequence of PIO commands provided by the sequencer logic facilitates the use of non-intelligent I/O adapters in reduced instruction-set computer (RISC) systems.

REFERENCES:
patent: 4901232 (1990-02-01), Harrington et al.
patent: 4939644 (1990-07-01), Harrington et al.
patent: 5339449 (1994-08-01), Karger et al.
patent: 5544345 (1996-08-01), Carpenter et al.
patent: 5640596 (1997-06-01), Takamoto et al.

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