DS90UB927-Q1 Datasheet, PDF (22/56 Pages) Texas Instruments – 5MHz - 85MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

DS90UB927-Q1, DS90UB927Q, DS90UB927Q-Q1
SNLS416B – JUNE 2012
www.ti.com
I2S REPEATER
I2S audio may be fanned-out and propagated in the repeater application. By default, data is propagated via Data
Island Transport on the FPD-Link interface during the video blanking periods. If frame transport is desired, then
the I2S pins should be connected from the deserializer to all serializers. Activating surround sound at the top-
level deserializer automatically configures downstream DS90UB927Q serializers and DS90UB928Q deserializers
for surround sound transport utilizing Data Island Transport. If 4-channel operation utilizing I2S_DA and I2S_DB
only is desired, this mode must be explicitly set in each serializer and deserializer control register throughout the
repeater tree (Table 5).
A DS90UB927Q serializer configured in repeater mode may also regenerate I2S audio from its I2S input pins in
lieu of Data Island frames. See the Repeater Connection Diagram (Figure 21) and the I2C Control Registers
(Table 5) for additional details.
REPEATER APPLICATION
The supported Repeater application provides a mechanism to extend transmission over multiple links to multiple
display devices.
REPEATER CONFIGURATION
In the repeater application, this document refers to the DS90UB927Q as the Transmitter (TX), and refers to the
DS90UB928Q as the Receiver (RX). Figure 19 shows the maximum configuration supported for Repeater
implementations using the DS90UB925/7Q (TX), and DS90UB926/8Q (RX). Two levels of Repeaters are
supported with a maximum of three Transmitters per Receiver. To ensure parallel video interface compatibility,
repeater nodes should feature either the DS90UB926Q/DS90UB925Q (RX/TX) chipset or the
DS90UB927Q/DS90UB928Q (RX/TX) chipset.
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 19. Maximum Repeater Application
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