DS90UH948-Q1 Datasheet, PDF (32/91 Pages) Texas Instruments – FPD-Link III to OpenLDI Deserializer

DS90UH948-Q1
SNLS473A – OCTOBER 2014 – REVISED JANUARY 2016
www.ti.com
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 25 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 25. 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.
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 outputs the unencrypted video data. In addition to
providing the video data, the LVDS interface communicates control information and packetized audio data. All
audio and video data is decrypted at the output of the HDCP Receiver and is re-encrypted by the HDCP
Transmitter. Figure 26 provides more detailed block diagram of a 1:2 HDCP repeater configuration.
If the repeater node includes a local output to a display, White Balancing and Hi-FRC dithering functions should
not be used as they will block encrypted I2S audio and HDCP authentication.
32
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
Product Folder Links: DS90UH948-Q1