Functional questions about DSP Builder

Thank you for replying.

For question 3, since from DSP Userguide:

"Simulink issues a warning if you are using an inappropriate solver for your model.You should set the solver options to fixed-step discrete when you are using a single clock domain."

"Use a fixed-step solver for a single clock domain design or a variable-step solver for multiple-clock domain designs."

"To ensure correlation between the HDL and Simulink simulation, you must use a discrete fixed or variable-step solver in Simulink."

But if I need to test the model in Variable-step and continues solver (i.e. ode45), can I still get the same result as discrete solver? Or even it give errors?

Thanks