METHOD AND SYSTEM FOR DETECTING SUCCESSFUL AUTHENTICATION OF MULTIPLE PORTS IN A TIME-BASED ROVING ARCHITECTURE

• US 20100180115A1
• Filed: 01/09/2009
• Published: 07/15/2010
• Est. Priority Date: 01/09/2009
• Status: Active Grant

• Current Assignee: Lattice Semiconductor Corporation
• Original Assignee: Silicon Image, Inc. (Lattice Semiconductor Corporation)
• Inventors: KIM, MYOUNG HWAN, Choi, Hoon
• Granted Patent: US 8,185,739 B2
• Time in Patent Office: Days
• 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 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; 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 initiating the re-authentication between the HDCP transmitting device and the HDCP receiving device includes a toggling of HPD or termination of the first port of the HDCP receiving device.

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

4. The method of claim 3, wherein the pipe of the HDCP architecture of the HDCP receiving device is a main pipe.

5. The method of claim 3, wherein the pipe of the HDCP architecture of the HDCP receiving device is a roving pipe.

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

7. The apparatus of claim 6, wherein initiating the re-authentication between the HDCP transmitting device and the HDCP receiving device includes a toggling of HPD or termination of the first port of the HDCP receiving device.

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

9. The apparatus of claim 8, wherein the pipe of the HDCP architecture of the HDCP receiving device is a main pipe.

10. The apparatus of claim 8, wherein the pipe of the HDCP architecture of the HDCP receiving device is a roving pipe.

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

12. The system of claim 11, wherein initiating the re-authentication between the HDCP transmitting device and the HDCP receiving device includes a toggling of HPD or termination of the first port of the HDCP receiving device.

13. The system of claim 11, wherein the HDCP architecture of the HDCP receiving device implements a time-based roving architecture.

14. The system of claim 13, wherein the pipe of the HDCP architecture of the HDCP receiving device is a main pipe.

15. The system of claim 13, wherein the pipe of the HDCP architecture of the HDCP receiving device is a roving pipe.