Through I2C interface, when host power off , we use BMC to do erase operation to clear the status register by writing the code 0x74 in “Register 0x39” after we inject the error with R04:0x40(GLOBAL_ERROR_LOG_BUCK_OV_OR_UV). After that we can see the value of the register R04,R05,R06 are cleared. The value of R04 is changed to 0x00.
But after AC cycle(VIN_Mgmt cycle), we see the error status is resumed, the value of R04 is resumed to 0x40 again. It seem that MTP memory for R04 Register has not been erased.
May i ask what is the condition to run erase operation to clear the status register by writing the code 0x74 in “Register 0x39”? Need host power on and 12V VIN_BULK?
R39 Codes:
Host Region Codes:
0x74: Clear Registers R04 to R07, Erase MTP memory for R04 Register.