DS90UB927-Q1 Datasheet, PDF (15/56 Pages) Texas Instruments – 5MHz - 85MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

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DS90UB927-Q1, DS90UB927Q, DS90UB927Q-Q1
SNLS416B – JUNE 2012
SDA
t_f
SCL
START
t_LOW
t_r
t_f
t_HD;STA
t_SP
t_r
t_BUF
t_HD;STA
t_HD;DAT
t_HIGH
t_SU;DAT
t_SU;STA
t_SU;STO
REPEATED
START
STOP START
Figure 11. Serial Control Bus Timing Diagram
I2S_CLK
T
t_LC
t_HC
V_IH
V_IL
I2S_WC
I2S_D[A,B,C,D]
t_sr
t_hr
Figure 12. I2S Timing Diagram
Functional Description
The DS90UB927Q converts a FPD-Link interface (4 LVDS data channels + 1 LVDS Clock) to a FPD-Link III
interface. This device transmits a 35-bit symbol over a single serial pair operating at up to a 2.975Gbps line rate.
The serial stream contains an embedded clock, video control signals, RGB video data, and audio data. The
payload is DC-balanced to enhance signal quality and support AC coupling.
The DS90UB927Q serializer is intended for use with a DS90UB928Q or DS90UH926Q deserializer, but is also
backward compatible with DS90UR906Q, DS90UR908Q, DS90UR910Q, and DS90UR916Q FPD-Link II
deserializers.
The DS90UB927Q serializer and DS90UB928Q or DS90UB926Q deserializer incorporate an I2C compatible
interface. The I2C compatible interface allows programming of serializer or deserializer devices from a local host
controller. In addition, the devices incorporate a bidirectional control channel (BCC) that allows communication
between serializer/deserializer as well as remote I2C slave devices.
The bidirectional control channel (BCC) is implemented via embedded signaling in the high-speed forward
channel (serializer to deserializer) combined with lower speed signaling in the reverse channel (deserializer to
serializer). Through this interface, the BCC provides a mechanism to bridge I2C transactions across the serial
link from one I2C bus to another. The implementation allows for arbitration with other I2C compatible masters at
either side of the serial link.
There are two operating modes available on DS90UB927Q: display mode and camera mode. In display mode,
I2C transactions originate from the host controller attached to the serializer and target either the deserializer or
an I2C slave attached to the deserializer. Transactions are detected by the I2C slave in the serializer and
forwarded to the I2C master in the deserializer. Similarly, in camera mode, I2C transactions originate from a
controller attached to the deserializer and target either the serializer or an I2C slave attached to the serializer.
Transactions are detected by the I2C slave in the deserializer and forwarded to the I2C master in the serializer.
Copyright © 2012, Texas Instruments Incorporated
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