Boots – shoes – and leggings
Patent
1992-01-24
1994-09-06
MacDonald, Allen R.
Boots, shoes, and leggings
364DIG1, 3642283, 364240, 3642401, 3642404, 3642405, 3642426, 36424292, 371 81, G06F 1300
Patent
active
053455665
ABSTRACT:
A method and apparatus for controlling a dual bus system, capable of realizing high speed and continuous operation even if one of the buses of the dual bus system fails. The method and apparatus has a dual bus system, a plurality of electronic circuits connected to both buses of the dual bus system, and bus controller for providing a bus use allowance signal to one of the plurality of electronic circuits, the one electronic circuit being selected in accordance with bus occupation request signals issued from the plurality of electronic circuits requesting data transfer. If the bus occupation request signals for both buses of the dual bus system originates from the one selected electronic circuit and the outputs of the arbiters coincide, the bus use allowance signal is provided to the one selected electronic circuit for the allowance of occupying both buses of the dual bus system. A completion of data transfer at the dual bus system is determined when data transfer is completed at both buses. Continuous operation can be ensured immediately upon occurrence of a failure, and high speed operation of a computer system is possible.
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Fukumaru Hiroaki
Masui Koji
Miyazaki Yoshihiro
Ogawa Hisao
Tanji Masayuki
Hitachi , Ltd.
MacDonald Allen R.
Sheikh Ayaz R.
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