DS90UB901Q_15 Datasheet, PDF (32/50 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
Camera A
DS90UB901Q
CMOS
Image
Sensor
DATA
PCLK
FSYNC
I²C
DS90UB902Q
DATA
PCLK
FSYNC
I²C
Serializer A
Camera B
DS90UB901Q
CMOS
Image
Sensor
DATA
PCLK
FSYNC
I²C
Deserializer A
DS90UB902Q
DATA
PCLK
ECU
Module
FSYNC
I²C
PC
Serializer B
Deserializer B
Figure 32. 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 33. GPIO Delta Latency
GENERAL PURPOSE I/O (GPIO)
The DS90UB901Q/902Q has up to 6 GPIO (2 dedicated and 4 programmable). GPIO[0] and GPIO[1] are always
available and GPIO[2:5] are available depending on the parallel data bus size. DIN/ROUT[0:3] can be
programmed into GPIOs (GPIO[2:5]) when the parallel data bus is less than 12 bits wide (10-bit data + HS,VS).
Each GPIO can be configured as either an input or output port. The GPIO maximum switching rate is up to 66
kHz when configured for communication between Deserializer GPI to Serializer GPO. Whereas data flow
configured for communication between Serializer GPI to Deserializer GPO is limited by the maximum data rate of
the PCLK.
AT-SPEED BIST (BISTEN, PASS)
An optional AT SPEED Built in Self Test (BIST) feature supports at speed testing of the high-speed serial and
the bidirectional control channel link. Control pins at the Deserializer are used to enable the BIST test mode and
allow the system to initiate the test and set the duration. A HIGH on PASS pin indicates that all payloads
received during the test were error free during the BIST duration test. A LOW on this pin at the conclusion of the
test indicates that one or more payloads were detected with errors.
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