Real Random Number Generator

[BarNash]

Hi all

Is there a way to implement a true random number generator with VHDL ?

Thanks
BarNash

 

[sleeman]

Hi all

Is there a way to implement a true random number generator with VHDL ?

Thanks
BarNash

No. Best you can do it find numbers you're happy with elsewhere: a
file, an internet connection, a diode-based random bit generator, and
try to hack something together so that a VHDL testbench can pull them
in.

- Kenn

 

[Tricky]

No.  Best you can do it find numbers you're happy with elsewhere: a
file, an internet connection, a diode-based random bit generator, and
try to hack something together so that a VHDL testbench can pull them
in.

 - Kenn

VHDL has a pseudo random number generator, but you can only use it in
testbenches. The function uniform() in the math_real package generates
random real values between 0 and 1. You can convert these into
anything you want.

As for random numbers on hardware - there is NO easy way to generate
them without specific phisical hardware. You can normally generate
pseudo random numbers with LFSRs. I have heard of one method that
registers a clock several times across long distances around an FPGA -
and that can normally be good enough as a random number generator, but
Ive never implemented it myself.

 

[Symon]

No, but google for :-
random webcam smoke alarm
for details on how to make a true random number generator for a few $.
Cheers, Syms.