DS90UB914ATRHSTQ1 Datasheet, PDF (51/68 Pages) Texas Instruments – DS90UB913A-Q1/DS90UB914A-Q1 25 to100 MHz 10/12-Bit

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DS90UB913A-Q1, DS90UB914A-Q1
SNLS443A – MAY 2013 – REVISED JUNE 2013
Camera A
Slave ID: (0xA0)
DS90UB913AQ
CMOS
Image
Sensor
DIN[11:0]
, HS, VS,
PCLK
DS90UB914AQ
ROUT[11:0],
HS, VS,
PCLK
SDA
SCL
I²C
PC/
EEPROM
Slave ID: (0xA2)
Camera B
Slave ID: (0xA0)
SER A: ID[x](0xB0)
DS90UB913AQ
CMOS
Image
Sensor
DIN[11:0]
, HS, VS,
PCLK
I²C
SDA
SCL
DES A: ID[x](0xC0)
SLAVE_ID0_ALIAS(0xA0)
SLAVE_ID0_ID(0xA0)
SLAVE_ID1_ALIAS(0xA2)
SLAVE_ID1_ID(0xA2)
DS90UB914AQ
ROUT[11:0],
HS, VS,
PCLK
ECU
Module
PC/
EEPROM
Slave ID: (0xA2)
SDA
SCL
I²C
I²C
SDA
SCL
SER B: ID[x](0xB2)
DES B: ID[x](0xC2)
SLAVE_ID0_ALIAS(0xA4)
SLAVE_ID0_ID(0xA0)
SLAVE_ID1_ALIAS(0xA6)
SLAVE_ID1_ID(0xA2)
Figure 38. Multiple Device Addressing
PC
Master
Synchronizing Multiple Cameras
For applications requiring multiple cameras for frame-synchronization, it is recommended to utilize the General
Purpose Input/Output (GPIO) pins to transmit control signals to synchronize multiple cameras together. To
synchronize the cameras properly, the system controller needs to provide a field sync output (such as a vertical
or frame sync signal) and the cameras must be set to accept an auxiliary sync input. The vertical synchronize
signal corresponds to the start and end of a frame and the start and end of a field. Note this form of
synchronization timing relationship has a non-deterministic latency. After the control data is reconstructed from
the bidirectional control channel, there will be a time variation of the GPIO signals arriving at the different target
devices (between the parallel links). The maximum latency delta (t1) of the GPIO data transmitted across
multiple links is 25 µs.
Note: The user must verify that the timing variations between the different links are within their system and timing
specifications.
See Figure 39 for an example of this function.
The maximum time (t1) between the rising edge of GPIO (i.e. sync signal) arriving at Camera A and Camera B is
25 µs.
Copyright © 2013, Texas Instruments Incorporated
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