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Thanks for your advice.
The detail situtation describe as follow.
We use TI's DSP, which only provides SPI interface, to capture a picture from a CMOS sensor but the sensor only provides I2C interface for control signal communication. We can't add more MCU between the DSP and the sensor because it's not efficiency. Therefore, we use a CPLD and write a program in it to transfer the control signal from SPI to I2C. Because it's a urgent event, I wonder if anybody have the experience to overcome this question. Must I need to write the program or is there any sample code for that already?
Thank you very much.