DS90UH927Q-Q1 Datasheet, PDF (26/68 Pages) Texas Instruments – 5-MHz to 85-MHz 24-Bit Color FPD-Link III Serializer with HDCP

DS90UH927Q-Q1
SNLS433C – NOVEMBER 2012 – REVISED JANUARY 2015
Device Functional Modes (continued)
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RxCLKIN +/-
RxIN3 +/-
Previous cycle
RxIN2 +/-
Current cycle (PCLK Period)
B[7]
(bit 26)
B[6]
(bit 25)
G[7]
(bit 24)
G[6]
(bit 23)
R[7]
(bit 22)
DE
(bit 20)
VS
(bit 19)
HS
(bit 18)
B[5]
(bit 17)
B[4]
(bit 16)
B[3]
(bit 15)
R[6]
(bit 21)
B[2]
(bit 14)
RxIN1 +/-
B[1]
(bit 13)
B[0]
(bit 12)
G[5]
(bit 11)
G[4]
(bit 10)
G[3]
(bit 9)
G[2]
(bit 8)
G[1]
(bit 7)
RxIN0 +/-
G[0]
(bit 6)
R[5]
(bit 5)
R[4]
(bit 4)
R[3]
(bit 3)
R[2]
(bit 2)
R[1]
(bit 1)
R[0]
(bit 0)
Figure 20. FPD-Link Mapping: MSBs on RxIN3 (MAPSEL=H)
7.4.5 HDCP
The Cipher function is implemented in the serializer per HDCP v1.3 specification. The DS90UH927Q-Q1
provides HDCP encryption of audiovisual content when connected to an HDCP capable FPD-Link III deserializer.
HDCP authentication and shared key generation is performed using the HDCP Control Channel which is
embedded in the forward and backward channels of the serial link. On-chip Non-Volatile Memory (NVM) is used
to store the HDCP keys. The confidential HDCP keys are loaded by TI during the manufacturing process and are
not accessible external to the device.
The DS90UH927Q-Q1 uses the Cipher engine to encrypt the data as per HDCP v1.3. The encrypted data is sent
through the FPD-Link III interface.
7.4.5.1 HDCP Repeater
The supported HDCP Repeater application provides a mechanism to extend HDCP transmission over multiple
links to multiple display devices. It authenticates all HDCP Receivers in the system and distributes protected
content to the HDCP Receivers using the encryption mechanisms provided in the HDCP specification.
7.4.5.2 HDCP I²S Audio Encryption
When HDCP is active, packetized Data Island Transport audio is also encrypted along with the video data per
HDCP v.1.3. I²S audio transmitted in Forward Channel Frame Transport mode is not encrypted. Depending on
the quality and specifications of the audiovisual source, HDCP encryption of digital audio may be required.
System designers should consult the specific HDCP specifications to determine if encryption of digital audio is
required by the specific application audiovisual source.
7.4.5.3 Repeater Configuration
In HDCP repeater application, this document refers to the DS90UH927Q-Q1 as the HDCP Transmitter (TX), and
refers to the DS90UH928Q-Q1 as the HDCP Receiver (RX). Figure 21 shows the maximum configuration
supported for HDCP Repeater implementations using the DS90UH925/7Q-Q1 (TX), and DS90UH926/8Q-Q1
(RX). Two levels of HDCP Repeaters are supported with a maximum of three HDCP Transmitters per HDCP
Receiver. To ensure parallel video interface compatibility, repeater nodes should feature either the
DS90UH926Q-Q1/DS90UH925Q (RX/TX) chipset or the DS90UH927Q-Q1/DS90UH928Q-Q1 (TX/RX) chipset.
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