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Altera_Forum's avatar
Altera_Forum
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16 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
16 years ago

according to xilinx doc a 4 bit shift register should have taps at 3,4

shift_reg(0) <= shift_reg(2) xor shift_reg(3);

shift_reg(3 downto 1) <= shift_reg(2 downro 0);