Patent ID: 8375150

Claim:
A High-Definition Multimedia Interface (HDMI) switch for communication with a plurality of HDMI sources and an HDMI receiver that supports High-Bandwidth Digital Content Protection (HDCP), the HDMI switch comprising: a plurality of HDMI inputs, each input corresponding to a respective HDMI source and comprising a differential clock channel, a plurality of Transition Minimized Differential Signaling (TMDS) data channels, and a display data channel (DDC); an HDMI output, the output including a differential clock output, a plurality of TMDS data outputs, and a DDC output; and HDMI switching circuitry configured to: receive a notification of a switch from a current HDMI source to a new HDMI source, determine, in response to the notification of the switch, whether the new HDMI source is actively transmitting data, has attempted to access at least one HDCP register in the HDMI receiver within a predetermined timeout delay since a previous HDCP register access attempt, and is transmitting unencrypted data, when the new HDMI source is actively transmitting data, has attempted to access the at least one HDCP register within the predetermined timeout delay, and is transmitting unencrypted data, output data received from the HDMI input corresponding to the new HDMI source over the HDMI output without resetting the new HDMI source, and when the new HDMI source is not actively transmitting data, has not attempted to access the at least one HDCP register within the predetermined timeout delay, or is transmitting encrypted data, reset the new HDMI source.