Other Parts Discussed in Thread: TFP401
Hi guys,
I want to make a design with the Raspberry Pi Compute module and 7" LCD display (which should be like 2-3 meters away from the PCB with the compute module).
I already bought the TFP401 board from Adafruit to give it a first try and it directly worked.
Now due to my lag of experience I have a couple of questions:
The TFP401 offers a 2pixel/clk mode and a 1pixel/clk mode.
Can you describe me shortly what's the story behind that odd / even pixels? I don't find any good information about this on the internet. All I got as information is that actually the chip receives the pixels from the HDMI and alternates every 1st pixel to be an odd one and every 2nd to be an even one.
The Adafruit board is in 1pixel/clk mode. So all pixels are pushed out over the even pixel-bus.
Would it be possible to run two LCD screens in parallel from this in the end? But how to configure this properly then at the HDMI transmitter?
My second question is about DS90URxxx transmitter / receiver couple.
This is a FDP-Link II device. In the datasheet is mentioned the data should be transmitted over a 100 Ohms impedance STP cable. Would be possible to use a standard CAT 5 cable for example and to use a twisted pair out of the 4 lines and to use the other wires for power supply on the receiver board?
However I saw that especially with FDP-Link III there are some circuits where the inverting LVDS output is connected to GND and to run the datastream single-ended over a 50 Ohm coax cable? Is this option then also possible with the FDP-Link II ?
And my third question then:
Could you please support me how to configure the config-pins of the DS90URxxx correctly that it will run well with the TFP401 when used in following configuration:
PIXS = Low,
OCK_INV = Low
ST = HIGH
DFO = Low
#STAG = High
Thanks a lot for your support.
