how is 8b/10b encoding and decoding done

[sridhara]

8b10b encoding & decoding

hi...
i need to know how the 8b/10b encoding and decoding is done....

All the materials i got from internet...says what is 8b/10b but i am not able to find how the encoding and decoding is done

Sridhar

 

[FvM]

8b/10b encoding

It is usually done in dedicated hardware in devices involving 8b/10b or e. g. in user programmed logic in an FPGA.

 

[sridhara]

10b 8b

my job is to write a hdl code to perform 8b/10b encoding... decoding any:idea:

 

[gregben]

just a simple ROM lookup is one way. For 8b->10b
you need a 256 x 10 ROM. For each of the 256
possible 8b input patterns there is a cooresponding
10b output. For going in the other direction (10b -> 8b)
you need a 1024 x 8 ROM.

 

[surelyxuan]

8b/10b encoding & decoding is composed by 3b/4b and 5b/6b encoding and decoding mechanism. Where 256 normal data codes and 12 special codes is provided. It is originated from IBM.