The I2C connection from the PD controllers and the USB4 Hub Controller communicates the connection present at the Type-C Ports. Each port on the USB4 controller may have its I2C interrupt pin to notify the USB4 Hub Controller which port has a new connection. The PD controllers have an option to use the shared interrupt for both ports or to have a separate interrupt for each port that is mapped to a GPIO in its configuration. In the shared interrupt case, the USB4 Hub Controller will query both port addresses and will determine which port has a data connection. For the dedicated interrupt the USB4 hub controller will only query the specific port address and determine the connection present.

Figure 9-2 shows the dedicated GPIO interrupt connection.

Figure 9-2 Dedicated Interrupts for USB4 Hub

Figure 9-3 shows the shared interrupt connection on I2C2_IRQ.

Figure 9-3 Shared Interrupts for USB4 Hub

Table 9-5 shows an example of the port I2C addresses for each of the PD controller ports.