High-bandwidth Digital Copy Protection (HDCP) Testing
Video generators with optional DVI digital video outputs contain the required firmware and hardware to support the Intel® Corporation based HDCP down- stream protocol. This permits the generator to act as an HDCP signal source for testing HDCP compliant Digital Video displays. The standard firmware includes HDCP Test Keys at no additional charge. Please contact your Quantum Data sales representative if you wish to purchase generators with an optional HDCP Production Key.
Test Method
HDCP testing with Test Keys uses the HdcpA1B1, HdcpA1B2, HdcpA2B1 and HdcpA2B2 test images. The last four characters in the image name identify which set of Test Keys are used. The HdcpProd image uses the optional produc- tion key. You need to make sure you are using a suitable digital video format for the given display under test and that it can correctly show other test images in a stable manner before using the HDCP test image.
The HDCP image consists of a screen of text displayed on the unit under test as shown below. When first selected, the test image is output without any HDCP encryption. The text lists the automatic sequencing through the internal and external HDCP communications authentication process with a "Pass" or "Fail" indication at the end of each step.
STEP | 1: | Reset receiver: gate off transmitter clk and data - | |||
STEP | 2: | Reset the transmitter and its HDCP engine | - | ||
STEP | 3: | Read and | verify | the receiver KSV | - |
STEP | 4: | Write receiver KSV to transmitter | - | ||
STEP | 5: | At transmitter | generate An | - | |
STEP | 6: | Write An | to the | receiver | - |
STEP | 7: | Write the transmitter KSV to the receiver | - | ||
STEP | 8: | Load the | transmitter secret keys | - | |
STEP | 9: | Read and | compare transmitter Ri with receiver Ri | - | |
STEP | 10: | Generate | authentication | - | |
STEP | 11: | Transmitting encrypted data |
| ||
Steps 1 and 2 are internal generator setup operations and should always pass. Once downstream authentication steps 3 through 10 pass, the test image will be output using HDCP encrypted video. The entire process repeats if step 9 Fails or if a monitor is disconnected and reconnected to the generator. Selecting another digital video format will restart the HDCP authentication process. Selecting a different test image stops HDCP encryption of the digital signals.
Once the authentication is passed, the connection will be reauthenticated every 128 fields of video. The current reauthentication status is shown with additional text in the lower portion of the test image.
Additional information about HDCP may be found on the World Wide Web at: http://www . digital - cp . com/
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