GreenPAK™ with Asynchronous State Machine (ASM)

格林帕克™ 包含异步状态机（ASM）宏单元的系列设备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、允许的状态转换的定义以及将触发每个状态转换的信号的定义。这个宏单元还可以灵活地连接到I/O引脚和其他GPAK资源以进行状态转换输入，并且宏单元的输出可以路由到其他资源或I/O引脚。此宏单元的两个重要性能参数是小于1的过渡时间µ从一个状态到另一个状态，待机电流小于1µ不处于活动状态转换时的状态。

GPAK设计器SW中的新ASM编辑器窗口中支持此ASM宏单元。这里显示的是ASM编辑器内的视图。此编辑器支持灵活性：

• Check boxes to select states in project, up to the allowable maximum number of states based on silicon architecture
• 编辑要匹配应用程序的状态名称
• Easy “point and click” actions to add state transitions
• Arrange state diagram for best comprehension
• Set value of output signals in Output RAM Array

在主要GPAK设计师GUI, ASM macro-cell shows up with inputs that drive state transitions, and outputs that can be routed to other internal resources, or out to pins. Inside each state, the allowed “next states” show up here, with an input that when asserted will cause that state transition to happen. The connection between resources used to make state transitions, and the state transition links is also shown back in the original ASM Editor window with labels on each of the state transition signals showing the source of the signal.

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.