In Stateflow, how to keep generated HDL code derived from a single state's flow chart from being placed in multiple states?

I am creating a state machine for decoding messages that I can query at any point and generating HDL form it. I have three states that don't do much - RESET/IDLE, WAIT_FOR_RESPONSE and WAIT_FOR_ACCEPT. The fourth state, ADDRESS_DECODE (A_D), does all the work. A_D has a few "enable:" commands but otherwise is a flow chart with some conditionals based on write enable, read enable and select flags that leads to a switch either reading to a register or writing to it for a given address.

The issue is in the generated HDL code. Since the other three states all lead to A_D the entire combinatoric logic within A_D is being placed not only in A_D but in the transition logic from any of the three states to A_D. Basically I have the same logic in four places - in each of the four state machine states when I only want it in A_D.

I understand that the logic is being placed there so that the logic executes on any transition into A_D as well as when the state machine is sitting in A_D waiting for something to happen. It's the equivalent of putting the logic both in A_D's "entry:" and "during:" blocks if I was putting this logic into a m-code function and calling it from the state actions. But I do not want this logic on a transition (entry:) and I can't figure out how to make it go away.

Can someone tell me how I tell Stateflow that a logic chart I define in a state I want only executed in that state - not on a transition as well? i.e., I want to tell it this logic is for "during:" and not both "entry:" and "during:."

I realize this is long but I hope this is clear.

Thank you!

Answer 1

[Landon Wagner]

I finally worked it out. After reading more I realized functions could help. Within state A_D I placed the flow chart logic being undesirably duplicated into a function and I put that function call into the "during:" action type. Now the generated HDL lives only in A_D and not duplicated in the other states on transition into A_D.