Texas Instruments FPD Link III - DS90UB903Q & DS90UB904Q EVK SERDESUB-21USB/NOPB SERDESUB-21USB/NOPB Data Sheet
Product codes
SERDESUB-21USB/NOPB
24
SERDESUB-21USB User’s Guide
SNLU101 – April 2012
Camera Mode:
In Camera mode, I2C transactions originate from the Master controller at the Deserializer
side. The I2C slave core in the Deserializer will detect if a transaction is intended for the
Serializer or a slave at the Serializer. Commands are sent over the bi-directional control
channel to initiate the transactions. The Serializer will receive the command and generate
an I2C transaction on its local I2C bus. At the same time, the Serializer will capture the
response on the I2C bus and return the response on the forward channel link. The
Deserializer parses the response and passes the appropriate response to the Deserializer
I2C bus.
Note: The default settings for this EVK are shipped with a display mode configuration, but
this EVK also supports a camera mode. This mode is suitable for setups where a camera
is connected to the DS90UB903Q Serializer end and a host controller is connected to the
DS90UB904Q Deserializer end. The I2C Master would need to be connected to the
DS90UB904Q Deserializer end. A typical setup for camera mode is shown below:
DS90UB904Q
Deserializer
SCL
SDA
MCU/FPGA
Host
PDB
RIN
+
-
ID[x]
PASS
LOCK
LOCK
ROUT[20:0]
PCLK
1.8V
VDDIO
GPI0
VDDIO
MODE (M_S)
DS90UB903Q
Serializer
SCL
SDA
Camera
Module
PDB
VDDIO
DOUT
+
-
ID[x]
DIN[20:0]
PCLK
1.8V
VDDIO
GPO0
MODE (M_S), RES0
VDDIO
SCL
SDA
SC
L
L
SD
A
A
0xB0
0xC0
0xA0
BISTEN, RES0
VD
D1
8
GPI1
GPI2
GPI3
GPI2
GPI3
GPO1
GPO2
GPO3
GPO3
(3.3V I/O)
(3.3V I/O)
1.0kΩ
1.0kΩ
0Ω
0Ω
10kΩ
10kΩ
1.0kΩ
1.0kΩ
1.8V 3.3V
1.8V 3.3V
VD
DI
O
VD
D1
8
VD
DI
O
DS90UB904Q
Deserializer
SCL
SDA
MCU/FPGA
Host
PDB
RIN
+
-
ID[x]
PASS
LOCK
LOCK
ROUT[20:0]
PCLK
1.8V
VDDIO
GPI0
VDDIO
MODE (M_S)
DS90UB903Q
Serializer
SCL
SDA
Camera
Module
PDB
VDDIO
DOUT
+
-
ID[x]
DIN[20:0]
PCLK
1.8V
VDDIO
GPO0
MODE (M_S), RES0
VDDIO
SCL
SDA
SC
L
L
SD
A
A
0xB0
0xC0
0xA0
BISTEN, RES0
VD
D1
8
GPI1
GPI2
GPI3
GPI2
GPI3
GPO1
GPO2
GPO3
GPO3
(3.3V I/O)
(3.3V I/O)
1.0kΩ
1.0kΩ
0Ω
0Ω
10kΩ
10kΩ
1.0kΩ
1.0kΩ
1.8V 3.3V
1.8V 3.3V
VD
DI
O
VD
D1
8
VD
DI
O
Figure 6. Example of DS90UB903Q/904Q in Camera Application