DS90UB914ATRHSTQ1 Datasheet, PDF (50/68 Pages) Texas Instruments – DS90UB913A-Q1/DS90UB914A-Q1 25 to100 MHz 10/12-Bit

DS90UB913A-Q1, DS90UB914A-Q1
SNLS443A – MAY 2013 – REVISED JUNE 2013
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Clock-Data Recovery Status Flag (LOCK), Output Enable (OEN) and Output State Select
(OSS_SEL)
When PDB is driven HIGH, the Deserializer’s CDR PLL begins locking to the serial input and LOCK is TRI-
STATE or LOW (depending on the value of the OEN setting). After the DS90UB914A-Q1 completes its lock
sequence to the input serial data, the LOCK output is driven HIGH, indicating valid data and clock recovered
from the serial input is available on the parallel bus and PCLK outputs. The states of the outputs are based on
the OEN and OSS_SEL setting (Table 11). See Figure Figure 22.
Serial Inputs
X
X
X
Static
PDB
0
1
1
1
Inputs
OEN
X
0
0
1
Static
1
1
Active
1
1
Active
1
1
Table 11. Output States
OSS_SEL
X
0
1
0
1
0
1
LOCK
Z
L or H
L or H
L
H
H
H
Pass
Z
L
Z
L
Previous State
L
Valid
Outputs
DATA, GPIO
Z
L
Z
L
L
L
Valid
CLK
Z
L
Z
L/Osc(Register Bit
Enable)
L
L
Valid
Programmable Controller
An integrated I2C slave controller is embedded in the DS90UB913A-Q1 Serializer as well as the DS90UB914A-
Q1 Deserializer. It must be used to configure the extra features embedded within the programmable registers or
it can be used to control the set of programmable GPIOs.
Multiple Device Addressing
Some applications require multiple camera devices with the same fixed address to be accessed on the same I2C
bus. The DS90UB913A/914 provides slave ID matching/aliasing to generate different target slave addresses
when connecting more than two identical devices together on the same bus. This allows the slave devices to be
independently addressed. Each device connected to the bus is addressable through a unique ID by programming
of the Slave alias register on Deserializer. This will remap the Slave alias address to the target SLAVE_ID
address; up to 8 ID Alias's are supported when slaves are attached to the SER and up to slave on the DES. The
ECU Controller must keep track of the list of I2C peripherals in order to properly address the target device.
See Figure 38 for an example of this function.
• 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, DES A (address 0xC0), with pass through enabled, 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 (address 0xC2), with pass through enabled, will forward the transaction to slave device
0xA2.
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