DVI Signal protocal

[dknguyen]

Does anyone know where I can find data on how to interpret a DVI signale from a video card?

 

[Marks256]

https://en.wikipedia.org/wiki/Digital_Visual_Interface

 

[dknguyen]

I mean the actual electrical signal itself.

 

[Sceadwian]

It's a real beast, not for the faint of the heart.

https://en.wikipedia.org/wiki/Transition_Minimized_Differential_Signaling
https://www.ddwg.org/lib/dvi_10.pdf

 

[dknguyen]

It is a two-stage process resulting in ten bits being used to represent eight bits. In the first stage each bit is either XOR or XNOR transformed against the previous bit, whilst the first bit is not transformed at all. The encoder chooses between XOR and XNOR by determining which will result in the fewest transitions; the ninth bit is added to show which was used. In the second stage, the first eight bits are optionally inverted to even out the balance of ones and zeros and therefore the sustained average DC level. The tenth bit is added to indicate whether this inversion took place.

Zah? I dont understand it entirely but it doesn't sound too hard to do in logic. Neat though, XORing to minimize the rising/falling edges.