DS90UH927Q-Q1 Datasheet, PDF (27/68 Pages) Texas Instruments – 5-MHz to 85-MHz 24-Bit Color FPD-Link III Serializer with HDCP

www.ti.com
Device Functional Modes (continued)
Source
TX
1:3 Repeater
TX
RX
TX
TX
DS90UH927Q-Q1
SNLS433C – NOVEMBER 2012 – REVISED JANUARY 2015
1:3 Repeater
TX
RX
TX
TX
1:3 Repeater
TX
RX
TX
RX
Display
RX
Display
RX
Display
RX
Display
RX
Display
TX
1:3 Repeater
TX
RX
TX
RX
Display
RX
Display
RX
Display
TX
RX
Display
Figure 21. HDCP Maximum Repeater Application
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 status available through the I²C interface. The RX
monitors the transmit port status for each TX and reads downstream KSV and KSV list values from the TX.
In addition to the I²C interface used to control the authentication process, the HDCP Repeater implementation
includes two other interfaces. The FPD-Link LVDS interface provides the unencrypted video data in 24-bit RGB
format and includes the DE/VS/HS control signals. In addition to providing the RGB video data, the LVDS
interface communicates control information and packetized audio data during video blanking intervals. A
separate I²S audio interface may optionally be used to send I²S audio data between the HDCP Receiver and
HDCP Transmitter in place of using the packetized audio. All audio and video data is decrypted at the output of
the HDCP Receiver and is re-encrypted by the HDCP Transmitter. Figure 22 provides more detailed block
diagram of a 1:2 HDCP repeater configuration.
If video data is output to a local display, White Balancing and Hi-FRC dithering functions should not be used as
they will block encrypted I²S audio.
Copyright © 2012–2015, Texas Instruments Incorporated
Product Folder Links: DS90UH927Q-Q1
Submit Documentation Feedback
27