DS90UH925Q Datasheet, PDF (28/47 Pages) Texas Instruments – 720p 24-bit Color FPD-Link III Serializer with HDCP

DS90UH925Q
ADD
(dec)
5
ADD Register
(hex) Name
0x05 I2C Control
6 0x06 DES ID
7 0x07 Slave ID
Bit(s)
7:5
4:3
2
1
0
7:1
0
7:1
0
Register
Type
RW
RW
RW
RW
RW
RW
RW
Default
(hex)
0x00
0x00
0X00
Function
SDA
Output
Delay
Local
Write
Disable
I2C Bus
Timer
Speedup
I2C Bus
timer
Disable
DES
Device ID
Device ID
Frozen
Slave
Device ID
Description
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
28
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