DLPC3479: Failed to communicate with dlpc3479 using the iic

Part Number: DLPC3479
Other Parts Discussed in Thread: DLP4710LC, , DLPA3005

Tool/software:

Hello!

I use a self-made board, the hardware structure is dlp4710lc + dlpc3479 + dlpa3005.

tri_out2 cannot be configured
The details are
tri_out1 configuration OK(8'h92 8'h02,8'h00,8'h04,8'h00,8'h00) (all values can be written normally)
tri_out2 configuration NG(8'h92 8'h03,8'h00,8'h00,8'h00,8'h00) (Slave does not answer when I write 8'h92)

We've checked the power-on timing. There's no problem. And test images can be output (register 05 is set to 01)

Please help analyze it !

Thank you very much!