DS90UB926Q-Q1 Datasheet, PDF (29/57 Pages) Texas Instruments – 5- to 85-MHz 24-Bit Color FPD-Link III Deserializer With Bidirectional Control Channel

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DS90UB926Q-Q1
SNLS422B – JULY 2012 – REVISED JANUARY 2015
Device Functional Modes (continued)
Table 8. Output States (continued)
INPUTS
OUTPUTS
Static
1
1
0
L
L
L
Static
1
1
1
L
Active
1
1
0
H
Active
1
1
1
H
Previous Status
L
Valid
L
L
Valid
L/OSC (Register bit
enable)
L
L
Valid
7.4.2 Low Frequency Optimization (LFMODE)
The LFMODE is set through the register (Table 11) or MODE_SEL Pin 24 (Table 9). It controls the operating
frequency of the deserializer. If LFMODE is Low (default), the PCLK frequency is between 15 MHz and 85 MHz.
If LFMODE is High, the PCLK frequency is between 5 MHz and <15 MHz. Please note when the device
LFMODE is changed, a PDB reset is required.
7.4.3 Configuration Select (MODE_SEL)
Configuration of the device may be done through the MODE_SEL input pin, or through the configuration register
bit. A pullup resistor and a pulldown resistor of suggested values may be used to set the voltage ratio of the
MODE_SEL input (V_R4) and V_DD33 to select one of the other 10 possible selected modes. See Figure 19 and
Table 9.
V_DD33
R₃
V_R4
R₄
MODE_SEL
DES
Figure 19. MODE_SEL Connection Diagram
NO. Ideal Ratio
V_R4/V_DD33
1
0
2
0.121
3
0.152
4
0.242
5
0.311
6
0.402
7
0.492
8
0.583
9
0.629
Ideal V_R4
(V)
0
0.399
0.502
0.799
1.026
1.327
1.624
1.924
2.076
Table 9. Configuration Select (MODE_SEL)
Suggested
Resistor R3
kΩ (1% tol)
Suggested
Resistor R4
kΩ (1% tol)
LFMODE ⁽¹⁾
Repeater ⁽²⁾
Open
40.2 or Any
L
L
294
40.2
L
L
280
49.9
L
H
240
76.8
L
H
226
102
H
L
196
130
H
L
169
165
H
H
137
191
H
H
124
210
L
L
Backward I2S Channel B
Compatible ⁽³⁾
(18–bit
Mode) ⁽⁴⁾
L
L
L
H
L
L
L
H
L
L
L
H
L
L
L
H
H
L
(1) LFMODE: L = 15 – 85 MHz (Default); H = 5 – <15 MHz
(2) Repeater: L = Repeater Off (Default); H = Repeater On
(3) Backward Compatible: L = Backward Compatible Off (Default); H = Backward Compatible On to 905/907 (15 - 65MHz)
(4) I2S Channel B: L = I2S Channel B Off, Normal 24-bit RGB Mode (Default); H = I2S Channel B On, 18-bit RGB Mode with I2S_DB
Enabled.
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