DS90UH947-Q1 Datasheet, PDF (26/87 Pages) Texas Instruments – 1080p OpenLDI to FPD-Link III Serializer with HDCP

DS90UH947-Q1
SNLS455 – NOVEMBER 2014
www.ti.com
8.3.14.1 HDCP
The HDCP Cipher function is implemented in the deserializer per HDCP v1.4 specification. The DS90UH947-Q1
provides HDCP encryption of audiovisual content when connected to an HDCP video source. HDCP
authentication and shared key generation 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.
8.3.14.2 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 devices in the system and distributes protected
content to the HDCP Receivers using the encryption mechanisms provided in the HDCP specification.
8.3.14.2.1 Repeater Configuration
In the HDCP repeater application, this document refers to the DS90UH947-Q1 as the HDCP Transmitter (TX),
and refers to the DS90UH948-Q1 as the HDCP Receiver (RX). Figure 24 shows the maximum configuration
supported for HDCP Repeater implementations. Two levels of HDCP Repeaters are supported with a maximum
of three HDCP Transmitters per HDCP Receiver.
Source
TX
1:3 Repeater
TX
RX
TX
TX
1:3 Repeater
TX
RX
TX
TX
1:3 Repeater
RX
Display
RX
Display
RX
Display
TX
RX
TX
RX
Display
RX
Display
TX
1:3 Repeater
TX
RX
TX
RX
Display
RX
Display
RX
Display
TX
RX
Display
Figure 24. HDCP Maximum Repeater Application
In a repeater application, the I2C interface at each TX and RX is 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.
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