PI3WVR31313A Datasheet, PDF (5/27 Pages) Pericom Semiconductor Corporation – DP/HDMI 1:3 De-multiplexer switches

PI3W VR31313A
DP/HDMI 1:3 De-multiplexer switches
Pin mapping for dual mode DP source DEMUX to DP output
DP mode
WVR31313A
HDMI/DVI mode input pins
WVR31313A
port1 output
ML_lane0(P)
ML_lane0(N)
ML_lane1(P)
ML_lane1(N)
ML_lane2(P)
ML_lane2(N)
ML_lane3(P)
ML_lane3(N)
TX2+
TX2-
TX1+
TX1-
TX0+
TX0-
TXC+
TXC-
D0P
D0N
D1P
D1N
D2P
D2N
D3P
D3N
D0P1
D0N1
D1P1
D1N1
D2P1
D2N1
D3P1
D3N1
WVR31313A
port2 output
D0P2
D0N2
D1P2
D1N2
D2P2
D2N2
D3P2
D3N2
WVR31313A
port3 output
D2P3
D2N3
D1P3
D1N3
D0P3
D0N3
CLKP3
CLKN3
Function Description
The MS pin selects I2C or pin control mode.
Pin control mode has only automatic port selection. I2C control mode has automatic port selection.
In auto port selection, when only one HPD high detected, the port with HPD high will be selected. When multiple HPD high
detected, the PRI_SEL pin(priority select) will determine the priority of the 3 ports.
When PRI_SEL=low, the port-priority will be port1-port2-port3 from high to low; when PRI_SEL=high, the port priority will be
port1-port3-port2 from high to low; when PRI_SEL=M (open as not connected), the port priority will be port3-port1-port2 from
high to low.
When port 1 (or port2) is selected and CAB_1 (or CAB_2) is low as in DP mode, the AUX/DDC channels will work as AUX
channels. AUXP shall have 100Kohm external resistor to GND and AUXN shall have 100Kohm external resistor to VDD. The data
rate of AUX channels will be >720Mbps.The internal DDC switch will be off.
When port 1 (or port2) is selected and CAB_1 (or CAB_2) is high when DP to HDMI adapter plugged, the AUX/DDC channels will
work as DDC channels. The internal DDC channels are on and the AUX channels are off. The input of DDC channels can tolerate
5V input and voltage of DDC to source will be limited about 3.3V or below.
When port 1 or port 2 is selected (passive ports), port3 with HDMI re-driver will shut down.
When port 3 is selected, the internal DP to HDMI level shifter will be enabled. There will be 3 EQ and 3 Pre-emphasis settings in
pin control mode, 8 EQ and 5 Pre-emphasis settings in I2C control mode.
When port 3 is selected, HDMI output can be standard TMDS-open-drain source, as well to be selected with internal source
termination as 50 ohm pull up to 3.3V VDD, using ROUT_SEL pin control or I2C control.
When port 3 is active as DP to HDMP level shifter, the DDC channel can be selected between bi-direction DDC buffer and passive
DDC switch.
HPD1, HPD2 and HPD3 are with internal CMOS buffers and can support 3.3V and 5V HPD inputs.
Squelch Mode
Squelch function will disable HDMI data output (as high impedance)when the voltage and frequency of input clock (TMDS) are
below squelch threshold, which will prevent random noise presenting in HDMI data output, thereby prevent noise on sink display.
Squelch function will enable-resume HDMI data output when input clock signals are above squelch threshold.
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www.pericom.com 12/03/15