DS90UH949-Q1 Datasheet, PDF (33/87 Pages) Texas Instruments – 1080p HDMI to FPD-Link III Bridge Serializer with HDCP

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DS90UH949-Q1
SNLS453 – NOVEMBER 2014
#
Ratio
V_R6/V_DD18
5
0.553
6
0.668
7
0.789
8
1
Table 8. Configuration Select (MODE_SEL1) (continued)
Target V_R6
(V)
0.995
1.202
1.420
1.8
Suggested
Resistor Pull-Up
R5 kΩ (1% tol)
Suggested
Resistor Pull-
Down R6 kΩ (1%
tol)
82.5
102
68.1
137
56.2
210
13.3
OPEN
EXT_CTL
1
1
1
1
COAX
0
0
1
1
REM_EDID_LOA
D
0
1
0
1
The strapped values can be viewed and/or modified in the following locations:
• EDID_SEL : Latched into BRIDGE_CTL[0], EDID_DISABLE (0x4F[0]).
• AUTO_SS : Latched into SOFT_SLEEP (0x01[7]).
• AUX_I2S : Latched into BRIDGE_CFG[1], AUDIO_MODE[1] (0x54[1]).
• EXT_CTL: Latched into BRIDGE_CFG[7], EXT_CONTROL (0x54[7]).
• 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 DS90UH940-Q1/DS90UH948-Q1. This mode is
compatible with the DS90UH926Q-Q1/DS90UH928Q-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. If HDCP is enabled, a single HDCP connection is created for the video that is sent on the two
links. The receiver must be a DS90UH948-Q1 or DS90UH940-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 DS90UH948-Q1/DS90UH940-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 HDCP Repeater. A second HDCP core is implemented to
support HDCP authentication and encryption to independent HDCP-capable receivers. 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 DS90UH949-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 DS90UH949-Q1 will be able to detect the HDMI pixel clock
frequency to select the proper operating mode.
Copyright © 2014, Texas Instruments Incorporated
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