DS90UB913Q, DS90UB914Q
SNLS420B –JULY 2012–REVISED APRIL 2013
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Table 2. DS90UB914Q Control Registers (continued)
Addr
(Hex)
Name
Bits
Field
R/W
Default
Description
Allows overriding OEN and OSS select coming
from Pins
1: Overrides OEN/OSS_SEL selected by pins
0: Does NOT override OEN/OSS_SEL select
by pins
OEN_OSS
Override
7
RW
0
6
5
OEN Select
OSS Select
RW
R
0
0
OEN configuration from register
OSS_SEL configuration from register
Allows overriding mode select bits coming from
back-channel
1: Overrides MODE select bits
0: Does not override MODE select bits
MODE_OVERRID
E
4
RW
0
PIN_MODE_12–bit
HF mode
Status of mode select pin
Mode and OSS
Select
3
2
R
R
0
0
0x1F
PIN_MODE_10 bit
mode
Status of mode select pin
Selects 12 bit high frequency mode. This bit is
automatically updated by the mode settings
from RX unless MODE_OVERRIDE is SET
1: 12 bit high frequency mode is selected.
0: 12 bit high frequency mode is not selected.
MODE_12–bit High
Frequency
1
0
RW
RW
0
0
Selects 10 bit mode. This bit is automatically
updated by the mode settings from RX unless
MODE_OVERRIDE is SET
MODE_10–bit
mode
1: Enables 10 bit mode.
0: Disables 10 bit mode.
The watchdog timer allows termination of a
control channel transaction if it fails to complete
within a programmed amount of time. This field
sets the Bidirectional Control Channel
Watchdog Timeout value in units of 2ms. This
field should not be set to 0.
BCC Watchdog
timer
7:1
RW
0
BCC Watchdog
Control
0x20
Disable Bidirectional Control Channel
Watchdog Timer
1: Disables BCC Watchdog Timer operation
0: Enables BCC Watchdog Timer operation
BCC Watchdog
Timer Disable
0
RW
RW
RW
RW
0
0
0
0
I2C Pass-Through All Transactions
0: Disabled
1: Enabled
I2C pass through
all
7
Internal SDA Hold Time This field configures
the amount of internal hold time provided for
the SDA input relative to the SCL input. Units
are 50ns.
I2C Glitch Filter Depth This field configures the
maximum width of glitch pulses on the SCL and
SDA inputs that will be rejected. Units are 10ns.
0x21
I2C Control 1
6:4
3:0
I2C SDA Hold
I2C Filter Depth
34
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