DS90UH925Q-Q1 Datasheet, PDF (23/56 Pages) Texas Instruments – 720p 24-bit Color FPD-Link III Serializer with HDCP

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DS90UH925Q-Q1
SNLS336J – OCTOBER 2010 – REVISED NOVEMBER 2014
7.4.3 Repeater Configuration
In HDCP repeater application, In this document, the DS90UH925Q-Q1 is referred to as the HDCP Transmitter or
transmit port (TX), and the DS90UH926Q-Q1 is referred to as the HDCP Receiver (RX). Figure 16 shows the
maximum configuration supported for HDCP Repeater implementations using the DS90UH925Q-Q1 (TX) and
DS90UH926Q-Q1 (RX). 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 16. HDCP Maximum Repeater Application
To support HDCP Repeater operation, the DS90UH926Q-Q1 Deserializer 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 DS90UH926Q-Q1 communicates with the I2C
slave within the DS90UH925Q-Q1 Serializer. The DS90UH925Q-Q1 Serializer handles authenticating with a
downstream HDCP Receiver and makes status available through the I2C interface. The DS90UH926Q-Q1
monitors the transmit port status for each DS90UH925Q-Q1 and reads downstream KSV and KSV list values
from the DS90UH925Q-Q1.
In addition to the I2C interface used to control the authentication process, the HDCP Repeater implementation
includes two other interfaces. A parallel LVCMOS 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 parallel
LVCMOS 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 over the parallel LVCMOS interface. All audio and
video data is decrypted at the output of the HDCP Receiver and is re-encrypted by the HDCP Transmitter.
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