8b10b encoding function

[shaiko]

Hello,

In the past, I've implemented a 8b/10b encoder based on a ROM lookup table and it works fine.

But what is the mathematical function behind it?

I.E
8b/10b is based on 5b/6b + 3b/4b.
What is the mathematical function that encodes 5b to 6b ?
What is the mathematical function that encodes 3b to 4b ?

 

[K-J]

What is the mathematical function that encodes 5b to 6b ?
What is the mathematical function that encodes 3b to 4b ?

Should I assume that you don't consider a truth table to be a mathematical function?

Kevin

 

[shaiko]

Should I assume that you don't consider a truth table to be a mathematical function?

It sure is. But I'm asking whether something more "linear" exists.

Something like, shift the number 3 times to the left and XOR it with the birthday date of your neighbor's dog.