带异步状态机（ASM）的GreenPak™

格林帕克™ 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，基于硅架构的允许最大状态
• 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
• 在输出RAM阵列中设置输出信号的值

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。

由于此宏小区不需要时钟输入，因此在不存在活动状态转换时将消耗小于1μA。这使设计人员在几分钟内创建低功耗设计的巨大灵活性。当设计等待时间长时间的事件驱动系统时，这尤其有价值，随着ASM宏小区可以保留在等待输入的低功率状态，并且在小于μs以更改状态的情况下反应。