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shift register question

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stef_eng

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Hi,

I'm designing a LFSR (8bit) (linear feedback shift reg.) with xnor feedback. There are 2 topologies: one-to-many(internal) and many to one(external). I was wondering if anyone could elaborate on the pros and cons of the two topologies?

For instance, I know that the one-to-many topology when compared to the many-to-one would reduce the propogation delay through xnor gates...but is there also a disadvantage to the internal LFSR topology?
 
Hi,

I'm designing a LFSR (8bit) (linear feedback shift reg.) with xnor feedback. There are 2 topologies: one-to-many(internal) and many to one(external). I was wondering if anyone could elaborate on the pros and cons of the two topologies?

For instance, I know that the one-to-many topology when compared to the many-to-one would reduce the propogation delay through xnor gates...but is there also a disadvantage to the internal LFSR topology?
Many-to-one is called a Fibonacci LFSR. One-to-many is called Galois. I used to know that, but had forgotten until I looked at the Wikipedia article on LFSRs.
The prop delay advantage you mentioned is the only one I can think of, although it has been 40+ years since I worked with them, so what the heck do I know?:D
I preferred Fibonacci at the time, but danged if I can remember why.
 
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