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DLP3021-Q1: Should DLPC120-Q1 always work together with DLP3021-Q1

Part Number: DLP3021-Q1
Other Parts Discussed in Thread: DLPC120-Q1, , DLP3021LEQ1EVM

Hi Expert,

below picture is from DLP3021-Q1EVM user's guide, but I don't find DLPC120-Q1 in the block diagram. From my understanding,  DLP3021-Q1 always work with  DLPC120-Q1. So what's the problem?

Thanks 

Elec Cheng