A packet structure for a mobile display digital interface

摘要

In a device using a mobile display digital interface (MDDI), an enhanced reverse encapsulation packet combines the feature of a separate round trip delay packet with a separate reverse encapsulation packet. The enhanced reverse encapsulation packet includes a first flag indicating a request for synchronization pattern to be transmitted from client to the host, a second flag indicating a request for a byte count of a number of bytes to be transmitted from the client to the host. A fixed period of time within the enhanced reverse link encapsulation packet is provided for the client's transmission to the host. The synchronization pattern is provided in a reverse data portion of the enhanced reverse link encapsulation packet transmitted by the client. The byte count is provided indicating a total number of bytes expected to be transmitted from the host to the client. A round trip delay is measured using the synchronization pattern. The byte count of the host is then aligned with the client.