Datasheet

22 SERDESUB-16USB User’s Guide SNLU100 – April 2012
b. DS90UB902Q Deserializer (0xC0)
i. Write 0x04 to Register 0x01
1. Verify that LOCK LED2 is lit; This indicates the chipset is
Locked
9) After initialization, the camera PCLK clock and input data can begin transmission to
the Serializer. The Serializer locks onto PCLK input (if present) otherwise the on-
chip oscillator (25 MHz) is used as the input clock source. Note the MCU controller
should monitor the LOCK pin and confirm LOCK = H before performing any I
2
C
communication across the link.
Figure 5. Virtual device addressing from MCU/FPGA I
2
C controller
I
2
C Communication over Bi-directional Control Channel in
Camera Mode
This section provides instructions for a simple I
2
C Read/Write transaction over the bi-
directional control channel validating the interface between the host and Deserializer to
Serializer.
1) Check the Deserializer SER DEV ID register 0x07 contents
2) The value entered in Deserializer register 0x07 sets the target Serializer device to
communicate with. Load the Serializer slave address register.
3) Host controller to load and transmit data byte to Serializer address 0xB0
4) For verification purposes Serializer register 0x13 General-purpose register will be
exercised for reading and writing data. Other Serializer registers can be
programmed to check internal functions; such as register 0x03 b[0] TRFB.