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DRV8220EVM: questions about DRV8220EVM

Part Number: DRV8220EVM
Other Parts Discussed in Thread: DRV8220,

Dear Team:

If the customer increases the operating frequency, the current will become a triangle wave as shown in the figure below

Is this normal? What is the reason?

step frequency is 500K.  If 1/256 microsteps are used, the highest control can only reach 1.95pps

Can we increase it to 1M or 1.5M? Do we have another solution can reach higher step frequency ? 

Many Thanks,