Hi Bruce, Thank you for your reply. 1. About the MCLK, I have test the MCLK output it is really the value I set (32MHz), according to current test, MCLK can over the spec. Because of other function requirement in this system, the MCLK can not be decreased to 25MHz. (You think this problem may because of MCLK is too high?) 2. About the slave device, I test this process with one PMBus device, this device not support the command PAGE which command code is 0x00, so it reply with NAK Best Regard, ZJY
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