Interrupt transactions may use either alternating data toggle bits, such that the bits are toggled only upon
successful transfer completion or a continuously toggling of data toggle bits. The host in any case must
assume that the device is obeying full handshake/retry rules as defined in Chapter 8. A device may choose
to always toggle DATA0/DATA1 PIDs so that it can ignore handshakes from the host. However, in this
case, the client software can miss some data packets when an error occurs, because the Host Controller
interprets the next packet as a retry of a missed packet.