DS90UB914ATRHSTQ1 Datasheet, PDF (52/68 Pages) Texas Instruments – DS90UB913A-Q1/DS90UB914A-Q1 25 to100 MHz 10/12-Bit

DS90UB913A-Q1, DS90UB914A-Q1
SNLS443A – MAY 2013 – REVISED JUNE 2013
Camera A
CMOS
Image
Sensor
DATA
PCLK
Serializer A
FSYNC
I2C
Deserializer A
DATA
PCLK
FSYNC
I2C
Camera B
CMOS
Image
Sensor
DATA
PCLK
Serializer B
FSYNC
I2C
Deserializer B
DATA
PCLK
ECU
Module
FSYNC
I2C
C
Figure 39. Synchronizing Multiple Cameras
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DES A
GPIO[n] Input
DES B
GPIO[n] Input
SER A
GPIO[n] Output
SER B
GPIO[n] Output
t1
Figure 40. GPIO Delta Latency
General Purpose I/O (GPIO) Descriptions
There are 4 GPOs on the Serializer and 4 GPIOs on the Deserializer when the DS90UB913A/914A chipsets are
run off the pixel clock from the imager as the reference clock source. The GPOs on the Serializer can be
configured as outputs for the input signals that are fed into the Deserializer GPIOs. In addition, the GPOs on the
Serializer can behave as outputs of the local register on the Serializer. The GPIOs on the Deserializer can be
configured to be the input signals feeding the output of the GPOs on the Serializer. In addition the GPIOs on the
Deserializer can be configured to behave as outputs of the local register on the Deserializer. If the
DS90UB913A/914A chipsets are run off the external oscillator source as the reference clock, then GPO3 on the
Serializer is automatically configured to be the input for the external clock and GPIO2 on the Deserializer is
configured to be the output of the divide-by-2 clock which is fed into the imager as its reference clock. In this
case, the GPIO2 and GPIO3 on the Deserializer can only behave as outputs of the local register on the
Deserializer. The GPIO maximum switching rate is up to 66 kHz when configured for communication between
Deserializer GPIO to Serializer GPO.
LVCMOS VDDIO Option
1.8V/2.8V/3.3V Serializer inputs and 1.8V/3.3V Deserializer outputs are user configurable to provide compatibility
with 1.8V, 2.8V and 3.3V system interfaces.
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