-
公开(公告)号:WO1995027250A1
公开(公告)日:1995-10-12
申请号:PCT/US1995002177
申请日:1995-02-22
Applicant: MOTOROLA INC.
Inventor: MOTOROLA INC. , POMBO, Raul , BORRAS, Jaime, A. , BRON, Michel
IPC: G06F11/34
CPC classification number: G06F12/1433 , G11C8/20
Abstract: Electronic devices using microprocessors requiring additional external memory can have security protection for the microprocessors while in an expanded mode of operation. A microprocessor (102) having a security access circuit (112) allows executable code to be stored in a peripheral storage device, such as external EPROM (124), while maintaining protection to the microprocessor EPROM (108) by monitoring if an instruction code is generated from an internal memory source or an external memory source.
Abstract translation: 使用需要附加外部存储器的微处理器的电子设备可以在扩展的操作模式下对微处理器提供安全保护。 具有安全访问电路(112)的微处理器(102)允许将可执行代码存储在诸如外部EPROM(124)的外围存储设备中,同时通过监视指令代码是否保持对微处理器EPROM(108)的保护, 从内部存储器源或外部存储器源产生。