带异步状态机（ASM）的GreenPak™

GreenPak™系列设备包括异步状态机（ASM）宏小区允许用户开发自己的自定义状态机设计。用户可以选择设置状态的定义，允许状态转换的定义以及将触发每个状态转换的信号的定义。此宏小区也可以灵活地连接到I / O引脚和用于状态转换输入的其他GPAK资源，并且可以从宏小区输出路由到其他资源或I / O引脚。该宏小区的两个重要性能参数是从状态到状态的转换时间小于1μs，并且在不存在状态转换时的待机电流小于1μA。

This ASM macro-cell is supported in a new ASM Editor window in GPAK Designer SW. Shown here is the view inside the ASM editor. This editor supports the flexibility to:

• 复选框,年代elect states in project, up to the allowable maximum number of states based on silicon architecture
• Edit state names to match application
• 轻松“点并单击”操作以添加状态转换
• 安排最佳理解的状态图
• Set value of output signals in Output RAM Array

在主GPAK设计器GUI中，ASM Macro-Cell会显示出驱动状态转换的输入，以及可以路由到其他内部资源的输出，或输出。在每个州内，允许的“下一个状态”在此处显示，具有输入，当断言时会导致状态转换发生。用于制作状态转换的资源之间的连接以及状态转换链路也在原始ASM编辑器窗口中显示，其中每个状态转换信号上的标签显示信号源。

As this macro-cell does not require a clock input, it will consume less than 1 µA when not in active state transition. This gives the designer tremendous flexibility to create low power designs in minutes. This is especially valuable when designing event driven systems that are waiting long periods of time with little activity, as the ASM macro-cell can remain in a low power state waiting for input, and and react in less than a µS to change state.