Particular signal generator on simulink

Hello All.

Im studying the clock source signals on frecuency domain. And for that I need to generate on simulink a pulse train and beside the frecuency, amplitude I need to setup the pulse rise and fall time. I was checking the pulse generators in simulink but for what I saw The only there are we can set up the amplitude and frecuency. I missing someone? there is a generator that can also setup the rise and fall time?

Thanks and regards.