发明授权
US4760515A Arbitration apparatus for determining priority of access to a shared bus
on a rotating priority basis
失效
用于基于旋转优先级确定对共享总线的访问优先级的仲裁装置
- 专利标题: Arbitration apparatus for determining priority of access to a shared bus on a rotating priority basis
- 专利标题(中): 用于基于旋转优先级确定对共享总线的访问优先级的仲裁装置
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申请号: US791647申请日: 1985-10-28
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公开(公告)号: US4760515A公开(公告)日: 1988-07-26
- 发明人: Carl A. Malmquist , John D. Wilson
- 申请人: Carl A. Malmquist , John D. Wilson
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G06F15/16
- IPC分类号: G06F15/16 ; G06F13/14 ; G06F13/30 ; G06F13/362 ; G06F13/364 ; G06F15/177 ; G06F13/18
摘要:
An arbitration apparatus for use within a computer system comprises a plurality of individual arbiters arranged in a particular configuration wherein some individual arbiters are higher in the particular configuration than a specific arbiter and some individual arbiters are lower in the particular configuration than the specific arbiter. Each arbiter has a request terminal for receiving access request signals, requesting access to a shared system bus, and an enable terminal for receiving an enabling signal. The enabling signal is generated and energizes the enable terminal of the specific arbiter if access requests are not received by higher arbiters in the particular configuration relative to the specific arbiter. If an access request signal energizes an arbiter and an enabling signal energizes the arbiter, an access grant signal is developed from the arbiter. If more than one access request signal energizes the arbiter at the same time, a command rotor, connected to the arbiter, determines the priority of access of the request signals to the shared bus in response to the "rotation" of the command rotor. If the access request signal is of a predetermined type, a pre-emptive grant signal may be developed from its arbiter even in the absence of an access request if there are no higher requests and no lower grants. If a refresh request is received by an arbiter when its enabling signal is not received, the refresh request is latched, and a refresh takes place when the enabling signal is finally generated.
公开/授权文献
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