GS8000 Datasheet, PDF (10/16 Pages) Gennum Corporation – DVI / HDMI Extender

GS8000 Data Sheet
3.3 Differential Outputs
The GS8000 contains four current mode differential signal output buffers capable
of driving a DVI 1.0-compliant or HDMI 1.1-compliant receiver. The TMDS outputs
are compatible with the DVI 1.0 or HDMI 1.1 specifications for input common mode
and swing.
The signal swing of each output is adjustable from 200mV to 2000mV differential
for a 100Ω load. An external 1% resistor connected from the OUT_SWING pin to
GNDQ sets the differential output signal amplitude.
NOTE: The differential outputs are designed to interface directly to a
DVI 1.0-compliant or HDMI 1.1-compliant receiver. They are not buffered to drive
any cable.
All differential outputs can be muted by setting the OE pin LOW. In this case, the
output buffers will become high impedance and device power will be reduced.
The output buffers use a separate power supply of +3.3V DC at the VDDQ and
GNDQ pins.
3.4 Signal Monitoring and Control
The signal monitoring and control block analyzes the signal received at the RXC
and RXC pins.
3.4.1 Sync Detect Output
When a valid signal is detected at the RXC/RXC pins, the sync detect (SCDT)
output pin will be set HIGH.
3.4.2 Output Enable
The GS8000’s differential signal outputs may be muted by setting the OE pin LOW.
This causes the output buffers to become high impedance.
To implement an auto mute on loss of input function, the SCDT output pin can be
connected externally to the OE input.
Proprietary and Confidential 25544 - 3 May 2005
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