GreenPAK™ with Asynchronous State Machine (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:

• Check boxes to select states in project, up to the allowable maximum number of states based on silicon architecture
• Edit state names to match application
• 简单的“点击”操作添加状态转换
• Arrange state diagram for best comprehension
• Set value of output signals in Output RAM Array

在主GPAK Designer GUI中，ASM宏单元显示了驱动状态转换的输入，以及可以路由到其他内部资源或输出到管脚的输出。在每个状态中，允许的“下一个状态”显示在这里，输入被断言时将导致状态转换发生。用于进行状态转换的资源与状态转换链接之间的连接也显示在原始ASM编辑器窗口中，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.