格林帕克™ 使用异步状态机（ASM）

GreenPAK™ family devices that include the Asynchronous State Machine (ASM) macro-cell allow the user to develop their own custom state machine designs. The user has the option to set the definition of the states, the definition of allowed state transitions, and the definition of the signals that will trigger each state transition. This macro-cell can also be flexibly connected to I/O pins and other GPAK resources for state transition inputs, and outputs from the macro-cell can be routed to other resources or I/O pins. Two important performance parameters for this macro-cell are transition times of less than 1 µS from state to state, and a standby current of less than 1µA when not in active state transition.

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:

• 复选框以选择项目中的状态，最多允许基于硅体系结构的最大状态数
• Edit state names to match application
• 容易”,点击“添加状态做出行动tions
• Arrange state diagram for best comprehension
• 输出RAM阵列中输出信号的设定值

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。

由于这个宏单元不需要时钟输入，所以它的消耗量将小于1µ不处于活动状态转换时的状态。这给了设计者极大的灵活性，可以在几分钟内创建低功耗设计。在设计等待时间长、活动少的事件驱动系统时，这一点尤其重要，因为ASM宏单元可以保持在低功耗状态等待输入，并在不到一小时的时间内做出反应µ改变状态。