Method and system for detecting successful authentication of multiple ports in a time-based roving architecture

• US 8,185,739 B2
• Filed: 01/09/2009
• Issued: 05/22/2012
• Est. Priority Date: 01/09/2009
• Status: Active Grant

• Current Assignee: Lattice Semiconductor Corporation
• Original Assignee: Silicon Image, Inc. (Lattice Semiconductor Corporation)
• Inventors: Choi, Hoon, Kim, Myoung Hwan
• Primary Examiner(s): Najjar, Saleh
• Assistant Examiner(s): Gao, Shu Chun
• Application Number:
  US12/351,712
• Publication Number:
  US 20100180115A1
• Time in Patent Office: 1,229 Days
• Field of Search: 713/168, 713/158
• US Class Current: 713/168
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/4367 Establishing a secure communication between the client and a peripheral device or smart card
• CPC Class Codes: H04N 7/163 by receiver means only

Abstract

In one embodiment of the present invention, a method includes authenticating an HDCP transmitting device at a first port of an HDCP receiving device. A port of the HDCP receiving device is connected to a pipe of an HDCP architecture of the HDCP receiving device at a first time. A synchronization signal is received from the HDCP transmitting device at the port of the HDCP receiving device at a second time. A loss of synchronization between the HDCP transmitting device and the HDCP receiving device is detected when the time-span between the first time and the second time is not greater than the period of time between synchronization signals sent from the HDCP transmitting device. A re-authentication is initiated between the HDCP transmitting device and the HDCP receiving device in response to detecting the loss of synchronization.

Claims

1. A method comprising:

authenticating a High-bandwidth Digital Content Protection (HDCP) transmitting device at a first port of an HDCP receiving device;

connecting the first port of the HDCP receiving device to a pipe of an HDCP architecture of the HDCP receiving device at a first time;

receiving a synchronization signal from the HDCP transmitting device at the first port of the HDCP receiving device at a second time;

detecting a loss of synchronization between the HDCP transmitting device and the HDCP receiving device when a time-span between the first time and the second time is not greater than a period of time between synchronization signals sent from the HDCP transmitting device, wherein detecting further includes monitoring a roving pipe of a time-based roving architecture to select a roving pipe of a plurality of roving pipes to replace a main pipe previously selected by a user; and

initiating a re-authentication between the HDCP transmitting device and the HDCP receiving device in response to detecting the loss of synchronization.

2. The method of claim 1, wherein the HDCP architecture of the HDCP receiving device implements a time-based roving architecture.

3. The method of claim 1, wherein the pipe of the HDCP architecture of the HDCP receiving device includes the main pipe.

4. The method of claim 1, wherein the pipe of the HDCP architecture of the HDCP receiving device includes the roving pipe.

5. An apparatus comprising:

an HDCP receiving device including a first port to authenticate an HDCP transmitting device;

an HDCP architecture of the HDCP receiving device to connect the first port of the HDCP receiving device to a pipe of the HDCP architecture at a first time;

the first port to receive a synchronization signal from the HDCP transmitting device at a second time;

a synchronization detector to detect a loss of synchronization between the HDCP transmitting device and the HDCP receiving device when a time-span between the first time and the second time is not greater than a period of time between synchronization signals sent from the HDCP transmitting device and to initiate a re-authentication between the HDCP transmitting device and the HDCP receiving device in response to detecting the loss of synchronization, wherein detecting further includes monitoring a roving pipe of a time-based roving architecture to select a roving pipe of a plurality of roving pipes to replace a main pipe previously selected by a user.

6. The apparatus of claim 5, wherein the HDCP architecture of the HDCP receiving device implements a time-based roving architecture.

7. The apparatus of claim 5, wherein the pipe of the HDCP architecture of the HDCP receiving device includes the main pipe.

8. The apparatus of claim 5, wherein the pipe of the HDCP architecture of the HDCP receiving device includes the roving pipe.

9. A system comprising:

an HDCP transmitting device coupled to a first port of an HDCP receiving device, the HDCP transmitting device to transmit a data stream and synchronization signals to the HDCP receiving device;

an HDCP receiving device including a first port to authenticate an HDCP transmitting device, the HDCP receiving device including an HDCP architecture;

the HDCP architecture of the HDCP receiving device to connect the first port of the HDCP receiving device to a pipe of the HDCP architecture at a first time;

the first port to receive a synchronization signal from the HDCP transmitting device at a second time;

a synchronization detector to detect a loss of synchronization between the HDCP transmitting device and the HDCP receiving device when a time-span between the first time and the second time is not greater than a period of time between synchronization signals sent from the HDCP transmitting device and to initiate a re-authentication between the HDCP transmitting device and the HDCP receiving device in response to detecting the loss of synchronization, wherein detecting further includes monitoring a roving pipe of a time-based roving architecture to select a roving pipe of a plurality of roving pipes to replace a main pipe previously selected by a user.

10. The system of claim 9, wherein the HDCP architecture of the HDCP receiving device implements a time-based roving architecture.

11. The system of claim 9, wherein the pipe of the HDCP architecture of the HDCP receiving device includes the main pipe.

12. The system of claim 9, wherein the pipe of the HDCP architecture of the HDCP receiving device includes the roving pipe.