To facilitate accessing four different device channels, the chip is supplied with eight configurable endpoints; four IN and four OUT. It is left to the customer to choose whether the device is configured to have one, two, or four endpoint pairs. The significant differences being the number of virtual channels/interfaces available and the amount of buffering memory available per endpoint. Each device has a maximum of 16 kBytes memory to share. If there is only one interface, then 16 kBytes is available on the IN and OUT endpoint. If there are four interfaces, then 2 kBytes is available on each IN and OUT endpoint. Defining the chip configuration is handled via a free utility which will program the configuration into the device’s on-board NVM.