Datasheet

26 SERDESUB-21USB User’s Guide SNLU101 – April 2012

slave mode the address register is compared with the address byte sent by the I

master. If the addresses are equal to any of registers values, the I

C slave will

acknowledge and hold the bus to propagate the transaction to the target device

otherwise it returns no acknowledge.

8) Execute I

C instructions to write the following registers

a. Assign ID Match values for camera address on Deserializer

i. Write 0xA0 to Register 0x08 of Deserializer (0xC0)

ii. Write 0xA0 to Register 0x10 of Deserializer (0xC0)

b. Wake up the Serializer by programming the ‘Remote Wakeup’ Register on

the Deserializer

i. Write 0x04 to Register 0x01 of Deserializer (0xC0)

9) Verify that LOCK LED2 on the Deserializer board is lit; This indicates the chipset is

Locked

10) 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

communication across the link.

CTRL

I2C

DS90UB904

Deserializer

0xC0

Camera

0xA0

DS90UB903

Serializer

0xB0