DS90UB949-Q1 Datasheet, PDF (33/82 Pages) Texas Instruments – 1080p HDMI to FPD-Link III Bridge Serializer

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DS90UB949-Q1
SNLS452 – NOVEMBER 2014
• COAX : Latched into DUAL_CTL1[7], COAX_MODE (0x5B[7]).
• REM_EDID_LOAD : Latched into BRIDGE_CFG[5] (0x54[5]).
8.4.2 FPD-Link III Modes of Operation
The FPD-Link III transmit logic supports several modes of operation, dependent on the downstream receiver as
well as the video being delivered. The following modes are supported:
8.4.2.1 Single Link Operation
Single Link mode transmits the video over a single FPD-Link III to a single receiver. Single link mode supports
frequencies up to 96MHz for 24-bit video when paired with the DS90UB940-Q1/DS90UB948-Q1. This mode is
compatible with the DS90UB926Q-Q1/DS90UB928Q-Q1 when operating below 85MHz. If the downstream
device is capable, the secondary FPD-Link III link could be used for high-speed control.
In Forced Single mode (set via DUAL_CTL1 register), the secondary TX Phy and back channel are disabled.
8.4.2.2 Dual Link Operation
In Dual Link mode, the FPD-Link III TX splits a single video stream and sends alternating pixels on two
downstream links. The receiver must be a DS90UB948-Q1 or DS90UB940-Q1, capable of receiving the dual-
stream video. Dual link mode is capable of supporting an HDMI clock frequency of up to 170MHz, with each
FPD-Link III TX port running at one-half the frequency. This allows support for full 1080p video. The secondary
FPD-Link III link could be used for high-speed control.
Dual Link mode may be automatically configured when connected to a DS90UB948-Q1/DS90UB940-Q1, if the
video meets minimum frequency requirements. Dual Link mode may also be forced using the DUAL_CTL1
register.
8.4.2.3 Replicate Mode
In this mode, the FPD-Link III TX operates as a 1:2 Repeater. The same video (up to 85MHz, 24-bit color) is
delivered to each receiver.
Replicate mode may be automatically configured when connected to two independent Deserializers.
8.4.2.4 Auto-Detection of FPD-Link III Modes
The DS90UB949-Q1 automatically detects the capabilities of downstream links and can resolve whether a single
device, dual-capable device, or multiple single link devices are connected.
In addition to the downstream device capabilities, the DS90UB949-Q1 will be able to detect the HDMI pixel clock
frequency to select the proper operating mode.
If the DS90UB949-Q1 detects two independent devices, it will operate in Replicate mode, sending the single
channel video on both connections. If the device detects a device on the secondary link, but not the first, it can
send the video only on the second link.
Auto-detection can be disabled to allow forced modes of operation using the Dual Link Control Register
(DUAL_CTL1).
8.5 Programming
8.5.1 Serial Control Bus
This serializer may also be configured by the use of a I2C compatible serial control bus. Multiple devices may
share the serial control bus (up to 8 device addresses supported). The device address is set via a resistor divider
(R1 and R2 — see Figure 21 below) connected to the IDx pin.
Copyright © 2014, Texas Instruments Incorporated
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