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| DS90UB921-Q1 Datasheet, PDF (24/57 Pages) Texas Instruments – 5 - 96 MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel | |||
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DS90UB921-Q1
SNLS488 â MARCH 2016
www.ti.com
7.4 Device Functional Modes
7.4.1 Configuration Select (MODE_SEL)
Configuration of the device may be done via the MODE_SEL input pin, or via the configuration register bit. A pull-
up resistor and a pull-down resistor of suggested values may be used to set the voltage ratio of the MODE_SEL
input (VR4) and VDD33 to select one of the other 7 possible selected modes. The voltage range in between the
Minimum and Maximum VR4 must be adhered even when taking resistor tolerances into account. The 1%
suggested resistors meet this for all cases, but others that also meet the desired voltage range are also
acceptable. See Figure 18 and Table 5.
VDD33
R3
VR4
R4
MODE_SEL
SER
Figure 18. MODE_SEL Connection Diagram
Table 5. Configuration Select (MODE_SEL)
#
MINIMUM
VR4 (V) (1)
MAXIMUM
VR4 (V)(1)
SUGGESTED
RESISTOR R3
k⦠(1% tol)
SUGGESTED
RESISTOR R4
k⦠(1% tol)
ALTERNATE
FREQUENCY
1
0.000
0.150
Open
40.2 or Any
L
2
0.530
0.596
90.9
18.7
L
3
0.725
0.800
93.1
28.0
L
4
0.930
1.012
71.5
30.1
H
5
1.165
1.284
68.1
40.2
H
6
1.480
1.599
82.5
71.5
H
7
1.750
1.905
73.2
90.9
H
Alternate Frequency:
See Frequency Mode Optimizations
Repeater:
L = Repeater OFF (Default)
H = Repeater ON
18-bit Mode:
L = Normal 24-bit RGB Mode (Default)
H = 18-bit RGB Mode. Note: use of GPIO(s) on unused inputs must be enabled by register.
REPEATER 18âBIT MODE
L
L
H
L
H
H
L
L
L
H
H
L
H
H
7.4.2 Repeater Application
The DS90UB921-Q1 and DS90UB926Q-Q1 can be configured to extend data transmission over multiple links to
multiple display devices. Setting the devices into repeater mode provides a mechanism for transmitting to all
receivers in the system.
7.4.2.1 Repeater Configuration
In the repeater application, in this document, the DS90UB921-Q1 is referred to as the Transmitter or transmit
port (TX), and the DS90UB926Q-Q1 is referred to as the Receiver (RX). Figure 19 shows the maximum
configuration supported for Repeater implementations using the DS90UB921-Q1 (TX) and DS90UB926Q-Q1
(RX). Two levels of Repeaters are supported with a maximum of three Transmitters per Receiver.
(1) Voltage indicated assumes nominal VDD33.
24
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Copyright © 2016, Texas Instruments Incorporated
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