DS90UB921-Q1 Datasheet, PDF (31/57 Pages) Texas Instruments – 5 - 96 MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

www.ti.com
ADD
(dec)
5
6
7
ADD
(hex)
0x05
REGISTER NAME
I2C Control
0x06 DES ID
0x07 Slave ID
DS90UB921-Q1
SNLS488 – MARCH 2016
Table 7. Serial Control Bus Registers (continued)
BIT(S)
7:5
4:3
TYPE
RW
2
RW
1
RW
0
RW
7:1
RW
0
RW
7:1
RW
0
DEFAULT
(hex)
0x00
0x00
0x00
FUNCTION
DESCRIPTION
SDA Output
Delay
Local Write
Disable
I2C Bus Timer
Speedup
I2C Bus timer
Disable
DES Device ID
Device ID
Frozen
Slave Device ID
Reserved
SDA output delay
Configures output delay on the SDA output. Setting this value will increase
output delay in units of 40ns.
Nominal output delay values for SCL to SDA are
00: 240ns
01: 280ns
10: 320ns
11: 360ns
Disable remote writes to local registers
Setting the bit to a 1 prevents remote writes to local device registers from
across the control channel. It prevents writes to the Serializer registers from
an I2C master attached to the Deserializer.
Setting this bit does not affect remote access to I2C slaves at the Serializer
Speed up I2C bus watchdog timer
1: Watchdog timer expires after ~50 ms.
0: Watchdog Timer expires after ~1 s
Disable I2C bus watchdog timer
When the I2C watchdog timer may be used to detect when the I2C bus is
free or hung up following an invalid termination of a transaction.
If SDA is high and no signalling occurs for ~1 s, the I2C bus assumes to be
free. If SDA is low and no signaling occurs, the device attempts to clear the
bus by driving 9 clocks on SCL
7-bit Deserializer Device ID
Configures the I2C Slave ID of the remote Deserializer. A value of 0 in this
field disables I2C access to the remote Deserializer. This field is
automatically configured by the Bidirectional Control Channel once RX Lock
has been detected. Software may overwrite this value, but should also
assert the FREEZE DEVICE ID bit to prevent overwriting by the
Bidirectional Control Channel.
Freeze Deserializer Device ID
Prevents autoloading of the Deserializer Device ID by the Bidirectional
Control Channel. The ID will be frozen at the value written.
7-bit Remote Slave Device ID
Configures the physical I2C address of the remote I2C Slave device
attached to the remote Deserializer. If an I2C transaction is addressed to
the Slave Device Alias ID, the transaction will be remapped to this address
before passing the transaction across the Bidirectional Control Channel to
the Deserializer
Reserved
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: DS90UB921-Q1
Submit Documentation Feedback
31