DS90UH925Q-Q1 Datasheet, PDF (14/56 Pages) Texas Instruments – 720p 24-bit Color FPD-Link III Serializer with HDCP

DS90UH925Q-Q1
SNLS336J – OCTOBER 2010 – REVISED NOVEMBER 2014
7 Detailed Description
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7.1 Overview
The DS90UH925Q-Q1 serializer transmits a 35-bit symbol over a single serial FPD-Link III pair operating up to
2.975 Gbps line rate. The serial stream contains an embedded clock, video control signals and DC-balanced
video data and audio data which enhance signal quality to support AC coupling. The DS90UH925Q-Q1 serializes
video and audio data then applies encryption through a High-Bandwidth Digital Content Protection (HDCP)
Cipher and transmits out through the FPD-Link III interface. Audio encryption is supported. The serializer also
includes the HDCP cipher. On board non-volatile memory stores the HDCP keys. All key exchange is conducted
over the FPD-Link III bidirectional control interface. The serializer is intended for use with the DS90UH926Q-Q1
deserializer, but is also backward compatible with DS90UR906Q or DS90UR908Q FPD-Link II deserializer.
7.2 Functional Block Diagram
24
RGB [7:0]
HS
VS
DE
PCLK
I2S_CLK 3
I2S_WC
I2S_DA
PDB
MODE_SEL
INTB
SDA
SCL
IDx
REGULATOR
D
PLL
Timing
and
Control
CMF
D_OUT +
D_OUT -
7.3 Feature Description
7.3.1 High Speed Forward Channel Data Transfer
The High Speed Forward Channel (HS_FC) is composed of 35 bits of data containing RGB data, sync signals,
HDCP, I2C, and I2S audio transmitted from Serializer to Deserializer. Figure 11 illustrates the serial stream per
PCLK cycle. This data payload is optimized for signal transmission over an AC coupled link. Data is randomized,
balanced and scrambled.
C1
C0
Figure 11. FPD-Link III Serial Stream
The device supports clocks in the range of 5 MHz to 85 MHz. The application payload rate is 2.975 Gbps
maximum (175 Mbps minimum) with the actual line rate of 2.975 Gbps maximum and 525 Mbps Minimum.
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