DS90UH947-Q1 Datasheet, PDF (33/87 Pages) Texas Instruments – 1080p OpenLDI to FPD-Link III Serializer with HDCP

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#
Ratio
V_R4/V_DD18
6
0.676
7
0.792
8
1
DS90UH947-Q1
SNLS455 – NOVEMBER 2014
Table 7. Configuration Select (MODE_SEL0) (continued)
Target V_R4
(V)
1.216
1.425
1.8
Suggested
Resistor Pull-Up
R3 kΩ (1% tol)
Suggested
Resistor Pull-
Down R4 kΩ (1%
tol)
51.1
107
30.9
118
40.2
OPEN
OLDI_DUAL
1
1
1
AUTO_SS
0
1
1
REPEATER
1
0
1
#
Ratio
V_R6/V_DD18
1
0
2
0.213
3
0.328
4
0.444
5
0.560
6
0.676
7
0.792
8
1
Table 8. Configuration Select (MODE_SEL1)
Target V_R6
(V)
0
0.383
0.591
0.799
1.008
1.216
1.425
1.8
Suggested Resistor Suggested Resistor
Pull-Up R5 kΩ (1% Pull-Down R6 kΩ
tol)
(1% tol)
OPEN
40.2
115
30.9
107
52.3
113
90.9
82.5
105
51.1
107
30.9
118
40.2
OPEN
MAPSEL
0
0
0
0
1
1
1
1
COAX
0
0
1
1
0
0
1
1
The strapped values can be viewed and/or modified in the following locations:
• OLDI_DUAL : Latched into OLDI_IN_MODE (0x4F[6], inverted from strap value).
• AUTO_SS : Latched into SOFT_SLEEP (0x01[7]).
• REPEATER : Latched into TX_RPTR (0xC2[5]).
• MAPSEL : Latched into OLDI_MAPSEL (0x4F[7]).
• COAX : Latched into DUAL_CTL1[7], COAX_MODE (0x5B[7]).
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.
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 OpenLDI 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.
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