Patent
1990-06-15
1995-05-16
Black, Thomas G.
395425, 395250, 395600, G06F 300, G06F 730, G06F 1506
Patent
active
054169070
ABSTRACT:
A method and apparatus for optimizing the performance of a multibus data processing system is provided. An I/O controller is coupled to the I/O bus and includes MORE bit setting means for initiating a MORE stream transaction on the I/O bus and for thereafter terminating the MORE stream transaction. An adapter coupling the I/O bus to the system bus, is configured to receive the MORE stream transaction and transfer it to main memory. The adapter includes MORE bit decoding means for identifying the beginning and the end of the MORE stream transaction, and for identifying whether the MORE stream transaction is a READ or WRITE transaction. The adapter also includes a first buffer for receiving data from the I/O bus and transferring the data to the memory in accordance with the memory's full block transfer size, and a second buffer for receiving a full block of data and transferring that data in accordance with the I/O bus transaction limitations. The adapter is capable of invalidating data located in the first buffer and clearing data located in the second buffer in accordance with a discard transaction when the I/O controller fails to properly terminate the MORE stream transaction.
REFERENCES:
patent: 3432813 (1969-03-01), Annunziata
patent: 4347567 (1982-08-01), DeTar
patent: 4396995 (1983-08-01), Grau
patent: 4447877 (1984-05-01), Grodalski
patent: 4570220 (1986-02-01), Tetrick et al.
patent: 4683534 (1987-07-01), Tietjen
patent: 4724518 (1988-02-01), Steps
patent: 4750154 (1988-06-01), Lefsky
patent: 4805098 (1989-02-01), Mills
patent: 4827400 (1989-05-01), Dunwell et al.
patent: 4831514 (1989-05-01), Turlakov
patent: 4841435 (1989-06-01), Papenberg
patent: 4875206 (1989-10-01), Nickols et al.
patent: 4878166 (1989-10-01), Johnson et al.
patent: 5038277 (1961-08-01), Altman
patent: 5073969 (1991-12-01), Shoemaker
Leahy James N.
Polzin R. Stephen
Willard Robert E.
Black Thomas G.
Digital Equipment Corporation
Fisher Arthur W.
Homere Jean R.
Maloney Denis G.
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