Need help with data store memory block of simulink

I am using some global variables in .m file so that their values generated in previous time step can automatically be used in the code. I am not getting any simple video on the above ..whaterver I have learned from the internet, I have applied to make a simulink model...could anyone suggest me what m I doing wrong?

some variables in the model are defined as model variables...like As, Af,Ca,Cm,sicrs,sicrf,Ms Mf...In actual .m file i used another .m file (prop.m) to define these variables (as they are constant parameters) while calling them in different fuction files.