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.

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：

• 复选框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
• 安排最佳理解的状态图
• Set value of output signals in Output RAM Array

Inside the main GPAK Designer GUI, the 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.