[sdiy] Non maximal-length LFSR

Richie Burnett rburnett at richieburnett.co.uk
Fri Mar 4 20:26:59 CET 2016


How is this done Dave?  Do you have a reference?

-Richie,

-----Original Message----- 
From: Dave Manley
Sent: Friday, March 04, 2016 7:07 PM
To: Richie Burnett ; Tom Wiltshire
Cc: synth-diy DIY
Subject: Re: [sdiy] Non maximal-length LFSR

It hasn't been mentioned, but the LFSR implementation can be done so that it 
generates multiple bits per update, not just a single bit.  This is commonly 
done in telecom/ networking descramblers which operate on a multi-bit serdes 
output.

-Dave

On March 4, 2016 5:24:02 AM PST, Richie Burnett 
<rburnett at richieburnett.co.uk> wrote:
>Yeah, but throwing away every 49th result would be throwing away 7
>years
>worth! ;-))  Could I live with that!?!?
>
>Thanks for everyone's help and suggestions about this.  I'm confident I
>know
>the way forward now, and also have some good pointers towards working
>through the maths to back up my decisions, which always makes me feel
>better.
>
>-Richie,
>
>
>
>-----Original Message----- 
>From: Tom Wiltshire
>Sent: Friday, March 04, 2016 12:17 PM
>To: Richie Burnett
>Cc: mskala at ansuz.sooke.bc.ca ; synth-diy DIY
>Subject: Re: [sdiy] Non maximal-length LFSR
>
>371 years!!
>
>On 4 Mar 2016, at 11:34, Richie Burnett <rburnett at richieburnett.co.uk>
>wrote:
>
>> Sure the resulting sequence will be a smidgen shorter, but 2^49-1 is
>quite
>> long anyway.
>
>
>
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