DS90UH927Q Datasheet, PDF (22/59 Pages) Texas Instruments – 5MHz - 85MHz 24-bit Color FPD-Link III Serializer with HDCP

DS90UH927Q
HDCP
The Cipher function is implemented in the serializer per HDCP v1.3 specification. The DS90UH927Q provides HDCP encryption
of audiovisual content when connected to an HDCP capable FPD-Link III deserializer. HDCP authentication and shared key gen-
eration is performed using the HDCP Control Channel which is embedded in the forward and backward channels of the serial link.
On-chip Non-Volatile Memory (NVM) is used to store the HDCP keys. The confidential HDCP keys are loaded by TI during the
manufacturing process and are not accessible external to the device.
The DS90UH927Q uses the Cipher engine to encrypt the data as per HDCP v1.3. The encrypted data is sent through the FPD-
Link III interface.
HDCP REPEATER
The supported HDCP Repeater application provides a mechanism to extend HDCP transmission over multiple links to multiple
display devices. It authenticates all HDCP Receivers in the system and distributes protected content to the HDCP Receivers using
the encryption mechanisms provided in the HDCP specification.
REPEATER CONFIGURATION
In HDCP repeater application, this document refers to the DS90UH927Q as the HDCP Transmitter (TX), and refers to the
DS90UH928Q as the HDCP Receiver (RX). Figure 17 shows the maximum configuration supported for HDCP Repeater imple-
mentations using the DS90UH925/7Q (TX), and DS90UH926/8Q (RX). Two levels of HDCP Repeaters are supported with a
maximum of three HDCP Transmitters per HDCP Receiver. To ensure parallel video interface compatibility, repeater nodes should
feature either the DS90UH926Q/DS90UH925Q (RX/TX) chipset or the DS90UH927Q/DS90UH928Q (RX/TX) chipset.
FIGURE 17. HDCP Maximum Repeater Application
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In a repeater application, the I2C interface at each TX and RX may be configured to transparently pass I2C communications
upstream or downstream to any I2C device within the system. This includes a mechanism for assigning alternate IDs (Slave Aliases)
to downstream devices in the case of duplicate addresses.
To support HDCP Repeater operation, the RX includes the ability to control the downstream authentication process, assemble the
KSV list for downstream HDCP Receivers, and pass the KSV list to the upstream HDCP Transmitter. An I2C master within the RX
communicates with the I2C slave within the TX. The TX handles authenticating with a downstream HDCP Receiver and makes
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