DS90UB924-Q1 Datasheet, PDF (29/62 Pages) Texas Instruments – 5-MHz to 96-MHz 24-bit Color FPD-Link III to OpenLDI Deserializer With Bidirectional Control Channel

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DS90UB924-Q1
SNLS512 – APRIL 2016
7.4.3 Low Frequency Optimization (LFMODE)
The LFMODE is set via register (Table 8) or by the LFMODE Pin. This mode optimizes device operation for
lower input data clock ranges supported by the serializer. If LFMODE is Low (LFMODE=0, default), the
TxCLKOUT± PCLK frequency is between 15 MHz and 96 MHz. If LFMODE is High (LFMODE=1), the
TxCLKOUT± frequency is between 5 MHz and <15 MHz. Note: when the device LFMODE is changed, a PDB
reset is required. When LFMODE is high (LFMODE=1), the line rate relative to the input data rate is multiplied by
four. Thus, for the operating range of 5 MHz to <15 MHz, the line rate is 700 Mbps to <2.1 Gbps with an effective
data payload of 175 Mbps to 525 Mbps. Note: for Backwards Compatibility Mode (BKWD=1), the line rate relative
to the input data rate remains the same.
7.4.4 Mode Select (MODE_SEL)
Device configuration may be done via the MODE_SEL pin or via register (Table 7). A pullup resistor and a
pulldown resistor of suggested values may be used to set the voltage ratio of the MODE_SEL input (VR4) and
V_DD33 to select one of the 9 possible selected modes. See Figure 28 and Table 6.
V_DD33
R₃
VR4
R₄
MODE_SEL
Deserializer
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Figure 28. MODE_SEL Connection Diagram
Table 6. Configuration Select (MODE_SEL)
NO.
Ideal Ratio
(V_R4/V_DD33)
Ideal
V_R4 (V)
Suggested
Resistor R₃
(kΩ, 1% tol)
Suggested
Resistor R₄
(kΩ, 1% tol)
REPEAT
1
0
0
OPEN
40.2
L
2
0.120
0.397
294
40.2
L
3
0.164
0.540
255
49.9
H
4
0.223
0.737
267
76.8
H
5
0.286
0.943
255
102
L
6
0.365
1.205
226
130
L
7
0.446
1.472
205
165
H
8
0.541
1.786
162
191
H
9
0.629
2.075
124
210
L
BKWD
L
L
L
L
L
L
L
L
H
I2S_B
L
H
L
H
L
H
L
H
L
LCBL
L
L
L
L
H
H
H
H
L
7.4.5 Repeater Configuration
The supported Repeater application provides a mechanism to extend transmission over multiple links to multiple
display devices.
For the repeater application, this document refers to the DS90UB927Q-Q1 as the Transmitter (TX), and refers to
the DS90UB924-Q1 as the Receiver (RX). Figure 29 shows the maximum configuration supported for Repeater
implementations. Two levels of Repeaters are supported with a maximum of three Transmitters per Receiver.
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