DS90UB927-Q1 Datasheet, PDF (34/56 Pages) Texas Instruments – 5MHz - 85MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

DS90UB927-Q1, DS90UB927Q, DS90UB927Q-Q1
SNLS416B – JUNE 2012
ADD
(dec)
5
ADD
(hex)
0x05
Register Name
I2C Control
6
0x06 DES ID
7
0x07 Slave ID 0
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Table 5. Serial Control Bus Registers (continued)
Bit(s)
7:5
4:3
2
1
0
7:1
0
7:1
0
Register
Type
RW
RW
RW
RW
RW
RW
Default
(hex)
0x00
0x00
0X00
Function
Description
SDA Output
Delay
Local Write
Disable
I2C Bus Timer
Speedup
I2C Bus timer
Disable
DES Device ID
Slave Device ID
0
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 (default)
01: 280ns
10: 320ns
11: 360ns
Disable Remote Writes to Local Registers Setting this bit to a 1 will
prevent remote writes to local device registers from across the control
channel. This 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.
0: Enable (default)
1: Disable
Speed up I2C Bus Watchdog Timer
0: Watchdog Timer expires after approximately 1s (default)
1: Watchdog Timer expires after approximately 50µs
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 signaling
occurs for approximately 1s, the I2C bus will be assumed to be free. If
SDA is low and no signaling occurs, the device will attempt to clear
the bus by driving 9 clocks on SCL
0: Enable (default)
1: Disable
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.
Reserved
7-bit Remote Slave Device ID 0 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 0, the
transaction will be remapped to this address before passing the
transaction across the Bidirectional Control Channel to the
Deserializer.
Reserved
34
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