包括用于测试访问控制要求的丰富功能集，例如用户的IP地址、时间和日期，或用户的名称是否出现在给定的列表中。

Includes a rich set of functions to test access control requirements, such as the user's IP address, time and date, or whether the user's name appears in a given list.

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这里CPLD主要实现逻辑控制部分的作用，主要完成了采样脉冲产生、地址译码等功能。

We use the CPLD to realize some control circuits, such as address decoder circuits and generate the sample impulses.

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MMU的功能是控制各种存储系统的工作并将虚地址转换成物理地址，以及控制存储器访问权限。

The functions of the MMU are to control the various memory systems, translate the virtual addresses into physical addresses and control the access permission.

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