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The Design Language of Statecharts. The Design Language of Statecharts. Initial state. Finite State Machine R , S, T – States a , b , c , d - Events Arrows - State transitions. optional. Event: a , b , c , ... a or/and b not a dly(t), tm(a,t) tr(C)/fs(C). Conditions:

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the design language of statecharts

The Design Language of Statecharts

Dr. Vered Gafni – Real time systems development by the formal approach

the design language of statecharts1
The Design Language of Statecharts

Initial state

Finite State Machine

  • R, S, T – States
  • a, b, c, d - Events
  • Arrows - State transitions

optional

Event:

a, b, c, ...

a or/and b

not a

dly(t), tm(a,t)

tr(C)/fs(C)

Conditions:

A, B,...

A or/and B

not(A)

in(S)

x=y, x<y,….

Actions:

a,b,…

tr!(C)/fs!(C)

x := v

rd!(x)

Dr. Vered Gafni – Real time systems development by the formal approach

examples
Examples

Split on condition

Dr. Vered Gafni – Real time systems development by the formal approach

sub states sequential refinement
Sub-States: Sequential Refinement
  • S is a super-state w.r.t {S1, S2, S3 }
  • Super-state transitions (priority)
  • History entrance (H* -deep history)

Dr. Vered Gafni – Real time systems development by the formal approach

example of sequential refinement
Example of Sequential Refinement

Equivalence

up to priorities

Dr. Vered Gafni – Real time systems development by the formal approach

sub states parallel refinement
Sub-states: Parallel Refinement

Events broadcasting

Dr. Vered Gafni – Real time systems development by the formal approach

slide7

Specification of Time Constraints

  • Delay: To turn on the furnace open the oil valve, and after 3 seconds activate ignition
  • RTC: Execute control loop at 10Hz rate

Dr. Vered Gafni – Real time systems development by the formal approach

delay as deadline
Delay as Deadline
  • Deadline: Whenever train enters XR, gate should be closed within 10 seconds; otherwise an alarm will be activated

Dr. Vered Gafni – Real time systems development by the formal approach

where timeout is useful
Where Timeout is useful ?

Dr. Vered Gafni – Real time systems development by the formal approach

synchronization techniques i
Synchronization Techniques I

Dr. Vered Gafni – Real time systems development by the formal approach

synchronization techniques ii
Synchronization Techniques II

Dr. Vered Gafni – Real time systems development by the formal approach

synchronization techniques iii
Synchronization Techniques III

Dr. Vered Gafni – Real time systems development by the formal approach

slide13

Example: Railroad crossing

Dr. Vered Gafni – Real time systems development by the formal approach

crossing control sequential design
Crossing Control: Sequential Design

Dr. Vered Gafni – Real time systems development by the formal approach

crossing control parallel design
Crossing Control: Parallel Design

Dr. Vered Gafni – Real time systems development by the formal approach

example automatic cruise control
Example: Automatic Cruise Control

Dr. Vered Gafni – Real time systems development by the formal approach

automatic cruise control
Automatic Cruise Control

Dr. Vered Gafni – Real time systems development by the formal approach

state operating sub state of active
State Operating (sub-state of Active)

Dr. Vered Gafni – Real time systems development by the formal approach

state commandmonitor component of operating
State CommandMonitor (component of Operating)

Dr. Vered Gafni – Real time systems development by the formal approach

slide21

Statemate

A Real-Time Design Tool

  • Provides for representation of 3 system views:
  • What:
  • - the activities the system should do, and inter-activities
  • data flow
  • When:
  • - the timing and synchronization of activities activation and
  • data transfer
  • Where:
  • - in what subsystem the each activity should be implemented

Dr. Vered Gafni – Real time systems development by the formal approach

basic components
Basic Components

A

E3

A1

u

f

f

f

f

C

h

e

A2

r

A3

E1

E2

CC

v

w

q

s

A2_1

A2_2

x

Dr. Vered Gafni – Real time systems development by the formal approach

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