DS90UB949-Q1 Datasheet, PDF (39/82 Pages) Texas Instruments – 1080p HDMI to FPD-Link III Bridge Serializer

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DS90UB949-Q1
SNLS452 – NOVEMBER 2014
Register Maps (continued)
ADD
(dec)
5
ADD
(hex)
0x05
Register Name
I2C Control
6
0x06 DES ID
Bit(s)
7:5
4:3
2
1
0
7:1
0
Table 10. Serial Control Bus Registers (continued)
Register
Type
RW
RW
RW
RW
RW
RW
Default
(hex)
0x00
0x00
Function
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 (default).
01: 280ns.
10: 320ns.
11: 360ns.
Local Write
Disable
Disable remote writes to local registers. Setting this bit to 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.
I2C Bus Timer Speed up I2C bus Watchdog Timer.
Speedup
0: Watchdog Timer expires after approximately 1s (default).
1: Watchdog Timer expires after approximately 50µs.
I2C Bus Timer
Disable
Disable I2C bus Watchdog Timer. 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.
DES Device ID
Port0/Port1
7-bit I2C address 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.
If PORT1_SEL is set, this register indicates the Deserializer Device ID for the
Deserializer attached to Port1.
Freeze Device
ID
Port0/Port1
Freeze Deserializer Device ID.
1: Prevents auto-loading of the Deserializer Device ID by the Bidirectional Control
Channel. The ID will be frozen at the value written.
0: Allows auto-loading of the Deserializer Device ID from the Bidirectional Control
Channel.
If PORT1_SEL is set, this register is with reference to Port1.
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