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DS90UB941AS-Q1: DSI_CLK_DET function

Part Number: DS90UB941AS-Q1

Tool/software:

Team,

Customer config 0x56 BRIDGE_CLK_MODE to 01: External Reference Clock Mode.

They found 0x5A bit [3..0] report 0x9 (DSI clk good) when external clock present, no matter DSI clk is present or not.

0x5A bit [3..0] report 0x2 (DSI clk bad) when external clock is not present, no matter DSI clk is present or not.

It seems 0x5A bit [3..0] follows PCLK but not DSI clk. Is it normal?