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2^31-1 PBRS Generator

growingmind

Hello,

I am looking for Verilog - A Code for 2^31-1 PBRS Generator in Cadence.

The Rand Bit Stream only generates, from what I know, a 2^7 sequence.

I set the seed to 512 in order to enable this.

Is it possible to generate 2^31-1 with rand bit stream in the ahdlLib part of Cadence ?

Can anyone advise if I am incorrect ?

Thank you.

  • The rand_bit_stream is not a PRBS source. It uses a pseudo-random number generator, $random, in the model, but this is not a fixed sequence - in fact I don't believe it should have a sequence (certainly not one that is a power of 2).

    We do however have the ability to use the vsource in analogLib and set the source type to prbs. If you do this, you can control the tap coefficients - essentially just as you would generate a PRBS if you were constructing one from logic gates. Or you can pick a predefined set (e.g. PN31). Some info can be found in this wikipedia article.

    Andrew.

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