Datasheet

DES
R
4
MODE_SEL
R
3
VR4
VDD33
DS90UH926Q
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SNLS337J OCTOBER 2010REVISED 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.
Figure 14. MODE_SEL Connection Diagram
Table 4. Configuration Select (MODE_SEL)
# Ideal Ratio Ideal V
R4
Suggested Suggested LFMODE Repeater Backward I2S Channel B
V
R4
/V
DD33
(V) Resistor R3 Resistor R4 Compatible (18–bit Mode)
k (1% tol) k (1% tol)
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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