Advance polling bus arbiter for use in multiple bus system

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3642283, 3642292, 3642301, 3642401, 3642409, 364241, 3642413, 3642427, 36424292, 3642592, 364DIG1, G06F 1322, G06F 13364, G06F 13366, G06F 1516

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050815768

ABSTRACT:
An advance polling bus arbiter includes a priority selector for selecting during a polling cycle a highest priority source system unit which is seeking access to a system bus. Bus grant logic sends the highest priority source system a bus grant signal which indicates that the selected system unit can make a transfer during the next cycle. An advance link logic unit compares a target bus address received from the selected system unit to a local bus address and simultaneously signals an intersystem bus link of an impending intersystem transfer while the source system unit is receiving its bus grant signal.

REFERENCES:
patent: 4100533 (1978-06-01), Napolitano et al.
patent: 4205373 (1980-05-01), Shah et al.
patent: 4468738 (1984-08-01), Hansen et al.
patent: 4470114 (1984-09-01), Gerhold
patent: 4586128 (1986-04-01), Dewoskin
patent: 4608700 (1986-08-01), Kirtley, Jr. et al.
patent: 4660141 (1987-04-01), Ceccon et al.

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