SONET deframer design ....

[ekavirsrikanth@gmail.com]

Hi,

i am doing RTL design for STS-3c deframer design where i need to catch
A1(F6) and A2(28) values at each frame (125us) rate. on recieving the
A1 and A2 values the SONET framer is detected and rest all the bytes
of the frame is descrambled. how can i proceed with the deframing part
as i need to check for A! and A2 at every time. can any one given me
some idea in this project. i am trying some ways but i am not clear in
this. whether i have to use state machine to catch A1 and A2
continously or i have to design fifo to store and then compare with
the state machine for A1 and A2.


regard
kil

 

[Mike Treseler]

ekavirsrikanth@gmail.com wrote:

how can i proceed with the deframing part
as i need to check for A! and A2 at every time.

If A1 and A2 are framing flags, then they
cannot occur inside the frame.

I would start by making some sample data to look at.
This looks interesting:

http://www.brorson.com/SONET_Model/SONET_Model.html


-- Mike Treseler