CSP layer provides briefness and wieldy function library for trader doing encrypt integration.

CSP层，即抽象设备层，其为加密服务集成商提供的简单、易用接口函数库。

ACLs initially worked well because few people used the mainframe, but as user bases grew, they became un­wieldy, leading to the use of groups.

访问控制列表最初工作得很好，因为没有很多人使用大型机，但随着用户基数的扩大，它们变得难以操作，导致了用户组的出现。

After analysis and discussion, the author puts forward a simple, cheap and wieldy communication scheme. MCU shares DSP"s bus and external memorizer to complete the exchange of data with DSP."

经过分析论证，本文提出了一种结构简单、成本低且易于实现的双机通信方法。