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21. 发明授权

US06212609B1 Alternate access mechanism for saving and restoring state of read-only register 失效
标题翻译：用于保存和恢复只读寄存器状态的备用访问机制
公开(公告)号：US06212609B1
公开(公告)日：2001-04-03
申请号：US08884785
申请日：1997-06-30
申请人： Darren Abramson , Joseph Bennett
发明人： Darren Abramson , Joseph Bennett
IPC分类号： G06F1200
CPC分类号： G06F1/30
摘要： The present invention relates to a method and apparatus for restoring a status data in a computer system. The circuit comprises: a read-only register for storing a read-only status value during a normal mode of operation; a first data path for supplying the read-only status value; a first control signal path for supplying a first control signal for controlling writing the supplied read-only status value into the read-only register during the normal mode of operation, the stored read-only status value being saved into a save area prior to removing power from the read-only register; a second data path for subsequently re-supplying from the save area the previously stored read-only status value; a second control signal path for supplying a second control signal for controlling restoration of the re-supplied read-only status value into the read-only register during a restore mode of operation; and circuitry coupling the first and second data and control signal paths to the read-only register to facilitate the writing during the normal mode of operation and the restoration during the restore mode of operation.
摘要翻译：本发明涉及一种在计算机系统中恢复状态数据的方法和装置。该电路包括：只读寄存器，用于在正常操作模式期间存储只读状态值; 用于提供只读状态值的第一数据路径; 第一控制信号路径，用于在正常操作模式期间提供用于控制将提供的只读状态值写入只读寄存器的第一控制信号，将所存储的只读状态值保存到保存区域中，然后再移除只读寄存器的电源; 第二数据路径，用于随后从保存区域重新提供先前存储的只读状态值; 第二控制信号路径，用于在恢复操作模式期间提供用于控制再提供的只读状态值恢复到只读寄存器的第二控制信号; 以及将第一和第二数据和控制信号路径耦合到只读寄存器的电路，以便于在恢复操作模式期间的正常操作模式和恢复期间的写入。

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