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The behavioural modelling of VHDL-AMS is a key factor in the development of analog and mixed-signal designs for communication devices. This paper presents a framework for the development of programmable mixed-signal devices, which integrates both programmable analog and digital circuits. The framework uses a VHDL-AMS based language, called VHDL-AMS-RTS, to describe the real-time domain and stochastic behaviour to adapt the simulation and performance analysis. The real-time stochastic statements of VHDL-AMS-RTS are added to the VHDL-AMS, which include time ordering and time constraint, probabilistic behaviour and quantitative description of mixed-signal devices. With this behavioural modelling environment it is possible to predict and optimize the analog and digital hardware using simulation but with a lower computational time and cost. To demonstrate the usefulness of the framework, we apply it to the structural performance analysis of soft input soft output (SISO) module of turbo decoding.