If TVSP is set to HUB/MCU Boot Mode, the device waits approximately 1 second after POR for a host to initiate a patch bundle download. 4CC Task commands can be used to do a patch bundle download such as the burst mode download (PBMx command, x is the letter corresponding to the specific command).

In burst mode download, the patch bundle is divided into 256 byte sectors and sent to the PD controller in one data transmission phase.

When the PD controller is powered on or reset in External HUB/MCU Boot Mode, the device enters patch mode ('PTCH' state in MODE (0x03) register) after roughly 850 ms and informs the host through the I2C interrupt by pulling GPIO9 low. The I2C interrupt indicates that the device has successfully entered ReadyForPatch status and is waiting for the host to transmit patch bundle data. Therefore, the initial steps for burst mode download are:

1. Power on the PD controller in HUB/MCU Boot Mode.
2. Confirm if the device is ready for a patch update by reading the INT_EVENT1 register (0x14). If any bit in the INT_EVENT1 register is 1, the device is ready for a patch update. An alternative method is to wait until an interrupt is asserted on the I2C bus and GPIO9 is pulled low.
3. Read the mode of the PD controller which is stored in the MODE register. If the mode shows ‘PTCH’, it means that the device has entered patch ready state.
4. Execute 4CC Task commands corresponding to burst mode download.