DS90UB901Q_15 Datasheet, PDF (30/50 Pages) Texas Instruments – 10 - 43MHz 14 Bit Color FPD-Link III Serializer and Deserializer with Bidirectional Control Channel

DS90UB901Q, DS90UB902Q
SNLS322E – JUNE 2010 – REVISED APRIL 2013
www.ti.com
For example in the configuration shown in Figure 30:
• ECU is the I²C master and has an I²C master interface
• The I²C interfaces in DES A and DES B are both slave interfaces
• The I²C protocol is bridged from DES A to SER A and from DES B to SER B
• The I²C interfaces in SER A and SER B are both master interfaces
If master controller transmits I²C slave 0xA0, the DES A address 0xC0 will forward the transaction to remote
Camera A. If the controller transmits slave address 0xA4, the DES B 0xC2 will recognize that 0xA4 is mapped to
0xA0 and will be transmitted to the remote Camera B. If controller sends command to address 0xA6, the DES B
0xC2 will forward transaction to slave device 0xA2.
The Slave ID index/match is supported only in the camera mode (SER: MODE pin = L; DES: MODE pin = H).
For Multiple device addressing in display mode (SER: MODE pin = H; DES: MODE pin = L), use the I²C pass
through function.
Camera A
Slave ID: (0xA0)
DS90UB901Q
DS90UB902Q
CMOS
Image
Sensor
DIN[15:0]
PCLK
ROUT[15:0]
PCLK
SDA
SCL
PC /
EEPROM
Slave ID: (0xA2)
Camera B
Slave ID: (0xA0)
I²C
SER A: ID[x](0xB0)
DS90UB901Q
CMOS
Image
Sensor
DIN[15:0]
PCLK
I²C
SDA
SCL
DES A: ID[x](0xC0)
SLAVE_ID1_MATCH(0xA0)
SLAVE_ID1_INDEX(0xA0)
SLAVE_ID2_MATCH(0xA2)
SLAVE_ID2_INDEX(0xA2)
DS90UB902Q
ROUT[15:0]
PCLK
ECU
Module
PC/
EEPROM
Slave ID: (0xA2)
SDA
SCL
I²C
SER B: ID[x](0xB2)
I²C
SDA
SCL
DES B: ID[x](0xC2)
SLAVE_ID2_MATCH(0xA4)
SLAVE_ID2_INDEX(0xA0)
SLAVE_ID2_MATCH(0xA6)
SLAVE_ID2_INDEX(0xA2)
Figure 30. Multiple Device Addressing
PC
Master
I²C PASS THROUGH
I²C pass-through provides an alternative means to independently address slave devices. The mode enables or
disables I²C bidirectional control channel communication to the remote I²C bus. This option is used to determine
whether or not an I²C instruction is to be transferred over to the remote I²C device. When enabled, the I²C bus
traffic will continue to pass through and will be received by I²C devices downstream. If disabled, I²C commands
will be blocked to the remote I²C device. The pass through function also provides access and communication to
only specific devices on the remote bus. The feature is effective for both Camera mode and Display mode.
For example in the configuration shown in Figure 31:
If master controller transmits I²C transaction for address 0xA0, the SER A with I²C pass through enabled will
transfer I²C commands to remote Camera A. The SER B with I²C pass through disabled, any I²C commands will
be bypassed on the I²C bus to Camera B.
30
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