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    • 2. 发明申请
    • Digital signal controller secure memory partitioning
    • 数字信号控制器安全的内存分区
    • US20050257016A1
    • 2005-11-17
    • US10846579
    • 2004-05-17
    • Brian BolesSumit MitraSteven Marsh
    • Brian BolesSumit MitraSteven Marsh
    • G06F12/14G06F12/00
    • G06F12/1491
    • A controller offers various security modes for protecting program code and data stored in memory and ensuring that the protection is effective during all normal operating conditions of the controller. The controller includes configuration settings that segment program memory into a boot segment, a secure segment and a general segment, each with a particular level of security including no enhanced protection. The boot code segment (BS) is the most secure and may be used to store a secure boot loader. The secure code segment (SS) is useful for storing proprietary algorithms from third parties, such as algorithms for separating ambient noise from speech in speech recognition applications. The general code segment (GS) has the least security. The controller is configured to prevent program flow changes that would result in program code stored in high security segments from being accessed by program code stored in lower security segments. In addition, the processor may be configured to have associated secure data portions of both program memory, such as flash memory, and random access memory (RAM) corresponding to the BS, SS and GS. Attempts to read data from or write data to the program memory or RAM associated with a higher security level from a lower security level are prevented from occurring.
    • 控制器提供各种安全模式,用于保护存储在存储器中的程序代码和数据,并确保在控制器的所有正常操作条件下保护有效。 控制器包括将程序存储器分割为引导段,安全段和通用段的配置设置,每个段具有特定级别的安全性,不包括增强的保护。 启动代码段(BS)是最安全的,可用于存储安全引导加载程序。 安全代码段(SS)用于存储来自第三方的专有算法,例如用于在语音识别应用中分离环境噪声与语音的算法。 一般代码段(GS)的安全性最低。 控制器被配置为防止程序流程改变,导致存储在高安全段中的程序代码被存储在较低安全段中的程序代码访问。 此外,处理器可以被配置为具有诸如闪存之类的程序存储器和对应于BS,SS和GS的随机存取存储器(RAM)的相关联的安全数据部分。 防止从较低安全级别读取数据或从与较高安全级别相关联的程序存储器或RAM写入数据的尝试发生。