DS90UH926QSQE Datasheet, PDF (24/56 Pages) Texas Instruments – DS90UH926Q 720p 24-bit Color FPD-Link III Deserializer with HDCP

DS90UH926Q
SNLS337J – OCTOBER 2010 – REVISED APRIL 2013
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To support HDCP Repeater operation, the DS90UH926Q 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 communicates with the I2C slave
within the DS90UH925Q Serializer. The DS90UH925Q Serializer handles authenticating with a downstream
HDCP Receiver and makes status available through the I2C interface. The DS90UH926Q monitors the transmit
port status for each DS90UH925Q and reads downstream KSV and KSV list values from the DS90UH925Q.
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.
Figure 16 provides more detailed block diagram of a 1:2 HDCP repeater configuration.
upstream
Transmitter
I2C
I2C
Master
HDCP Receiver
DS90UH926
Parallel
LVCMOS
I2S Audio
HDCP Transmitter
DS90UH925
I2C
Slave
HDCP Transmitter
DS90UH925
I2C
Slave
downstream
Receiver
or
Repeater
downstream
Receiver
or
Repeater
FPD-Link III interfaces
Figure 16. HDCP 1:2 Repeater Configuration
Repeater Connections
The HDCP Repeater requires the following connections between the HDCP Receiver and each HDCP
Transmitter Figure 17.
1. Video Data – Connect PCLK, RGB and control signals (DE, VS, HS).
2. I2C – Connect SCL and SDA signals. Both signals should be pulled up to V_DD33 with 4.7 kΩ resistors
3. Audio – Connect I2S_CLK, I2S_WC, and I2S_DA signals.
4. IDx pin – Each HDCP Transmitter and Receiver must have an unique I2C address.
5. MODE_SEL pin – All HDCP Transmitter and Receiver must be set into the Repeater Mode.
6. Interrupt pin– Connect DS90UH926Q INTB_IN pin to DS90UH925Q INTB pin. The signal must be pulled up
to V_DDIO.
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