发明授权
US06216190B1 System and method for optimally deferring or retrying a cycle upon a processor bus that is destined for a peripheral bus
有权
用于最佳延迟或重试一个周期的系统和方法,处理器总线上用于外设总线
- 专利标题: System and method for optimally deferring or retrying a cycle upon a processor bus that is destined for a peripheral bus
- 专利标题(中): 用于最佳延迟或重试一个周期的系统和方法,处理器总线上用于外设总线
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申请号: US09164192申请日: 1998-09-30
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公开(公告)号: US06216190B1公开(公告)日: 2001-04-10
- 发明人: Kenneth T. Chin , Clarence K. Coffee , Michael J. Collins , Jerome J. Johnson , Phillip M. Jones , Robert A. Lester , Gary J. Piccirillo
- 申请人: Kenneth T. Chin , Clarence K. Coffee , Michael J. Collins , Jerome J. Johnson , Phillip M. Jones , Robert A. Lester , Gary J. Piccirillo
- 主分类号: G06F1342
- IPC分类号: G06F1342
摘要:
A computer is provided having a bus interface unit coupled between a CPU bus, a peripheral bus, and a memory bus. The bus interface unit includes a processor controller linked to the CPU bus for controlling the transfer of cycles from the CPU to the peripheral bus and memory bus. Those cycles can be arranged in order within the CPU bus pipeline. A subset of cycles destined for a peripheral bus can be stalled within a snoop phase associated with the CPU bus. Snoop stall can continue until a memory cycle is encountered upon the CPU bus pipeline within a phase prior to the snoop phase. Once the memory cycle progresses to the snoop phase, snoop stall can be discontinued and the previous, peripheral cycles can then be deferred and/or retried, allowing the memory cycle to be quickly dispatched through all phases of the CPU bus and onto the memory bus. In this fashion, memory cycles can be completed quickly, yet deferrals or retries are minimized to avoid the throughput penalty associated with deferring or retrying cycles back again through each phase of the CPU bus.
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