公开(公告)号：US20040123178A1

公开(公告)日：2004-06-24

申请号：US10324741

申请日：2002-12-18

申请人： International Business Machines Corporation

发明人： Gary Dale Carpenter ,  Vikas Chandra

IPC分类号： G06F013/372 ,  G06F001/04 ,  G06F001/12 ,  G06F005/06

CPC分类号： G06F1/24 ,  G06F1/08 ,  G06F1/10 ,  G06F1/12 ,  G06F13/364

摘要： In one form, a method for communicating among subsystems coupled to a bus of a computer system on an integrated circuitry chip includes operating subsystems at independent clock frequencies when the subsystems are not communicating with one another on the bus. Selected pairs of the subsystems are operated at a shared clock frequency by selectively varying frequencies of clock signals to the subsystems, so that communication can occur at the shared clock frequency on the bus between the selected subsystems, but at different clock frequencies for respective different pairings of the subsystems, and so that the subsystems can operate at independent clock frequencies when not communicating with other ones of the subsystems. Communication among the subsystems is by a bus-based protocol, according to which when a subsystem is granted access to the bus the subsystem has exclusive use of the bus.

摘要翻译： 在一种形式中，用于在集成电路芯片上耦合到计算机系统的总线的子系统之间通信的方法包括当子系统在总线上彼此不通信时以独立的时钟频率操作子系统。 通过选择性地改变到子系统的时钟信号的频率，选择的子系统对以共享时钟频率操作，使得通信可以在所选择的子系统之间的总线上的共享时钟频率处发生，但是对于不同的配对在不同的时钟频率 并且使得子系统可以在不与子系统中的其他子系统通信时以独立的时钟频率工作。 子系统之间的通信是基于总线的协议，根据该协议，当子系统被授权访问总线时，该子系统具有专用的总线。