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    • 4. 发明授权
    • Key storage error processing system
    • 密钥存储错误处理系统
    • US4514847A
    • 1985-04-30
    • US419927
    • 1982-09-20
    • Terutaka TateishiKazuyuki Shimizu
    • Terutaka TateishiKazuyuki Shimizu
    • G06F3/00G06F11/10G06F12/10G06F12/12G06F12/14
    • G06F12/1466G06F11/1008G06F11/1076G06F12/126G06F2212/1032
    • In a system which is provided with a key storage having stored therein main storage keys respectively corresponding to pages into which a main storage is split, each main storage key having at least a reference bit indicating whether the corresponding page is being accessed and a change bit indicating whether information has been written in the page, and in which a parity bit is added to each of the reference bits and the change bits to form the main storage key. There are provided a detecting device for detecting a parity error in a pair of the reference bit and the parity bit and a pair of the change bit and the parity bit when the main storage key is read out, and a device for rewriting the main storage key after setting the reference bit to a "1" indicating the corresponding page is being accessed and adding a new parity bit "0" to the reference bit when a parity error is detected by the detecting device in the pair of the reference bit and the parity bit and after setting the change bit to a "1" indicating a write in the corresponding page and adding an new parity bit "0" to the change bit when a parity error is detected in the pair of the change bit and the parity bit, thereby controlling the saving of the pages of the main storage into external storage.
    • 在具有密钥存储器的系统中,其中存储有分别对应于主存储器被分割的页面的主存储密钥,每个主存储密钥至少具有指示是否正在被访问的对应页面的参考位和改变位 指示信息是否已被写入页面中,并且其中将奇偶校验位添加到每个参考位和更改位以形成主存储密钥。 提供了一种检测装置,用于在读取主存储密钥时检测一对参考位和奇偶校验位以及一对改变位和奇偶校验位的奇偶校验错误,以及用于重写主存储器 在将参考位设置为指示相应页面的“1”之后,在参考位对中检测设备检测到奇偶校验错误时,向参考位添加新的奇偶校验位“0” 奇偶校验位,并且在将改变位设置为指示对应页面中的写入的“1”,并且当在该对改变位和奇偶校验位中检测到奇偶校验错误时,向改变位添加新的奇偶校验位“0” 从而控制将主存储器的页面保存到外部存储器中。