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pulkit
Level 1
Level 1
First question asked Welcome!

Hi,

I was going through document AN2358 which suggests an approach to implementing a Manchester decoder.

I have a query about the implementation.

IEEE 802.3 Ethernet standard states that the input data (Manchester encoded) may have a jitter of +-18ns. Now if this is used in a decoder with a fixed delay count (3/4) to sample an input data bit, how will this circuit sample the correct data and produce the recovered output?

Is there any other way this jitter in the input data can be handled to recover the correct data bit?

Thanks

Pulkit

 

 

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wmaxfield
Level 4
Level 4
10 replies posted 10 likes received 5 questions asked

If you look at the logic in the AN, you can see that the only criteria is the "end of delay."  If the transition occurs within the 0 to end of delay window, you will get the data bit and the clock pulse.  The clock pulse will provide the signal to shift in the data.

Manchester is mainly self-clocking, which simplifies the decode.  shift into a shift-register, once the register is full, read the data out.

 

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ADSW
Moderator
Moderator
Moderator
250 sign-ins 50 solutions authored 25 likes received

Hi, 

Thread was locked due to inactivity for long time, you can continue the discussion on the topic by opening a new thread with reference to the locked one.
The continuous discussion in an inactive thread may mostly be unattended by community users.

Thanks and Regards,
Andri

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