DS90UB947-Q1 Datasheet, PDF (27/81 Pages) Texas Instruments – 1080p OpenLDI to FPD-Link III Serializer

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DS90UB947-Q1
SNLS454 – NOVEMBER 2014
8.3.14.2 Repeater Connections
The Repeater requires the following connections between the Receiver and each Transmitter Figure 26.
1. Video Data – Connect all FPD-Link data and clock pairs. Single pixel OpenLDI (D[3:0]) or Dual pixel
OpenLDI (D[7:0]) are both possible, provided the Deserializer and all Serializers are configured in the same
mode.
2. I2C – Connect SCL and SDA signals.
3. Audio (optional) – Connect I2S_CLK, I2S_WC, and I2S_Dx signals. Audio is normally transported on the
OpenLDI interface.
4. IDx pin – Each Transmitter and Receiver must have an unique I2C address.
5. MODE_SEL pins — All Transmitters and Receivers must be set into Repeater Mode. OpenLDI settings
(single pixel vs. dual pixel) must also match.
6. Interrupt pin – Connect DS90UB948-Q1 INTB_IN pin to the DS90UB947-Q1 INTB pin. The signal must be
pulled up to V_DDIO with a 10kΩ resistor.
Deserializer
Serializer
D[7:0]+
D[7:0]-
CLK1+
CLK1-
VDD33
MODE_SEL1
I2S_CLK
I2S_WC
I2S_Dx
VDD33
IDx
INTB_IN
Optional
VDDIO
VDD33
D[7:0]+
D[7:0]-
CLK+
CLK-
VDD18
MODE_SEL0
I2S_CLK
I2S_WC
I2S_Dx
INTB
VDD18
IDx
SDA
SCL
SDA
SCL
Figure 26. Repeater Connection Diagram
8.3.14.2.1 Repeater Fan-out Electrical Requirements
Repeater applications requiring fan-out from one DS90UB948-Q1 Deserializer to up to three DS90UB947-Q1
Serializers requires special considerations for routing and termination of the FPD-Link differential traces.
Figure 27 details the requirements that must be met for each signal pair:
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