Hi Eden Li,
For these kits the NXP is providing the reference application as C-source Code and the FreeMASTER with MCAT option to tune your setup.

If by "Model software demo" you meant to say Simulink model example for such setup - then i'm afraid we do not have such models.
Anyhow - you have all the bits&pieces in the Toolbox for MPC5643L to allow you to replicate the Reference design example. In case you have issues with modelling we are more than happy to assist you thru the modelling process.
Best regards,
Daniel