NRZI encoder:

Invert the NRZ data, then apply to both the J and K inputs of a J-K
flipflop; clock to the clk input of the FF. Q output of the FF is the
encoded NRZI data.

NRZI decoder:

Encoded NRZI data to both the input of a D flipflop and one input of an
XOR gate. Q* (Q-not) output of the D-FF to the other input of the XOR gate.
Clk to the clk input of the FF. XOR output is the decoded NRZ data.


-- Tom, N5EG





"Mariusz SP3FXC" wrote in message
...
Hi,

I'm looking for some info on NRZI coding. google gives me useless
links...
nothing special. I am about to write someting that uses NRZI but i can not
find any specification.

I appreciate any input on this.

Regards,

Mariusz SP3FXC