I want to use UCD9244 + UCD74120 to provide the Freescale T2080 VDD power.
The VDD power voltage need to be changed after the boot process.
The T2080 Datasheet suggest that a PMbus regulator can be used,then after boot process some PMbus commands can be send to that regulator through T2080's I2C interface.
The initial voltage is 1.025V and VID voltage range is 0.9V to 1.1V, with a resolution of 12.5mV or better.
So I think there are two ways.
First is to use the VOUT_COMMAND,no VID setting in GUI.
Second is to use VID_CODE_RAIL,also set using 8 bit VID through PMbus and VID voltage range is 0.9V to 1.1V in GUI,the resolution is 0.78125mV.
From the UCD92xx Digital PWM System Controller PMBus Command Reference,the only difference between those two command is the voltage resolution.
Are there any other difference,like TRANSITION_RATE ect?
