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Altera_Forum's avatar
Altera_Forum
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15 years ago

Do you use LPMs for your LFSRs?

I want to implement an LFSR as a means of generating random numbers but I'm not sure whether to use an LPM or just code it in a process. I would be interested to hear how you choose to implement them...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Probably your xor results in 1 always.

You need to use standard proven register lengths and taps.

There is plenty of literature for various sizes and taps.

e.g.one from xilinx: google xilinx LFSR

also note your feedback point should be at one end rather than 2nd stage