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SN65DSI85-Q1: Change from SN65DSI85 to SN65DSI84

Part Number: SN65DSI85-Q1
Other Parts Discussed in Thread: SN65DSI84-Q1, SN65DSI84

Hi experts,

Customer want to change SN65DSI85-Q1 to SN65DSI84-Q1, can they replace the chip directly on PCB? Any hardware change is needed? For software, which registers need to be modified? 

Note: Customer use SN65DSI85-Q1in dual-input, dual-output mode, will use SN65DSI84-Q1 in single-input, dual-output mode. The DSI bandwidth of SN65DSI84 is enough after calculation.

Thank you.