DS90UH926QSQE Datasheet, PDF (19/56 Pages) Texas Instruments – DS90UH926Q 720p 24-bit Color FPD-Link III Deserializer with HDCP

DS90UH926Q
www.ti.com
SNLS337J – OCTOBER 2010 – REVISED APRIL 2013
INTERRUPT PIN — FUNCTIONAL DESCRIPTION AND USAGE (INTB)
1. On DS90UH925, set register 0xC6[5] = 1 and 0xC6[0] = 1
2. DS90UH926Q deserializer INTB_IN (pin 16) is set LOW by some downstream device.
3. DS90UH925Q serializer pulls INTB (pin 31) LOW. The signal is active low, so a LOW indicates an interrupt
condition.
4. External controller detects INTB = LOW; to determine interrupt source, read HDCP_ISR register .
5. A read to HDCP_ISR will clear the interrupt at the DS90UH925, releasing INTB.
6. The external controller typically must then access the remote device to determine downstream interrupt
source and clear the interrupt driving INTB_IN. This would be when the downstream device releases the
INTB_IN (pin 16) on the DS90UH926Q. The system is now ready to return to step (1) at next falling edge of
INTB_IN.
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 (V_R4) and V_DD33 to select one of the other 10 possible selected modes. See Figure 14 and Table 4.
VDD33
R₃
VR4
R₄
MODE_SEL
DES
Figure 14. MODE_SEL Connection Diagram
Table 4. Configuration Select (MODE_SEL)
# Ideal Ratio
V_R4/V_DD33
Ideal V_R4
(V)
Suggested
Resistor R3
kΩ (1% tol)
Suggested
Resistor R4
kΩ (1% tol)
LFMODE
Repeater
Backward I2S Channel B
Compatible (18–bit Mode)
1
0
0
Open
40.2 or Any
L
L
L
L
2
0.121
0.399
294
40.2
L
L
L
H
3
0.152
0.502
280
49.9
L
H
L
L
4
0.242
0.799
240
76.8
L
H
L
H
5
0.311
1.026
226
102
H
L
L
L
6
0.402
1.327
196
130
H
L
L
H
7
0.492
1.624
169
165
H
H
L
L
8
0.583
1.924
137
191
H
H
L
H
9
0.629
2.076
124
210
L
L
H
L
LFMODE:
L = frequency range is 15 – 85 MHz (Default)
H = frequency range is 5 – <15 MHz
Repeater:
L = Repeater mode is OFF (Default)
H = Repeater mode is ON
Backward Compatible:
L = Backward Compatible mode is OFF (Default)
H = Backward Compatible mode is ON; SER = DS90UR905Q or DS90UR907Q
– frequency range = 15 - 65MHz, set LFMODE = L
I2S Channel B:
L = I2S Channel B mode is OFF, Normal 24-bit RGB Mode (Default)
H = I2S Channel B mode is ON, 18-bit RGB Mode with I2S_DB Enabled. Note: use of GPIO(s) on unused inputs must be enabled by
register.
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