Junction Noise

[Brockr0 at cs.com]

Magnus, cfmd at swipnet.se writes:

> So similar but oh so diffrent.
>  
>  Are you sure you meant NOR? XOR or XNOR is more like it.
>  
>  

I'll get this right yet.

NAND and XOR actually, for CRC generation. Input data NANDed with last stage 
output fed back to the first stage and XORed at the polynomial taps,except 
they are inputs so they are not really taps... 

If you want a pseudo-random pattern generator, you don't have an input data 
stream, so change the output NAND to NOT and feed it back to the first stage 
and the polynomial XOR inputs. I don't know if every prime polynomial will 
give a maximal length non-repeating string with no invalid states but I 
believe the common communications CRC polynomials such as CRC-32 and CRC-16 
work this way as they are chosen for this convolution  characteristic.


Brock Russell