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Design Languages >> Verilog-AMS >> maximum integer in verilog-A/AMS
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Message started by Aigneryu on Jan 13^th, 2009, 8:24am

Title: maximum integer in verilog-A/AMS
Post by Aigneryu on Jan 13^th, 2009, 8:24am

I thought 32-bit integer can be used in verilog-A; however, it may not be the case. I tried to use an integer variable/parameter in verilog-A model in spectre simulation, but the system told me that only maximum 2097152 is allowed.

Does anyone have this problem before? I need an at least 24bit unsigned integer. I have tried if it is due to the parameter or the integer variable, I used both in my model.

Title: Re: maximum integer in verilog-A/AMS
Post by Andrew Beckett on Jan 13^th, 2009, 9:59am

Really? From my quick experiment, the largest integer is 2147483647 (2^31-1) which is reasonable if it is signed. I tried in both the latest MMSIM70 Hotfix, and IC5141 (so quite an old release of spectre).

Which version of spectre are you using? Can you post the code example that breaks?

It seems a bit odd that the number you gave is 2^21
Regards,

Andrew.

Title: Re: maximum integer in verilog-A/AMS
Post by Aigneryu on Jan 13^th, 2009, 11:49am

My mistake. I just found it was my mistake. I put a upper bound on the parameter hidden somewhere in the long code.

I also confirmed that the integer can go up to 2^31.
Thanks.

Title: Re: maximum integer in verilog-A/AMS
Post by neoflash on Sep 18^th, 2010, 10:35pm

How can we enable a number even larger?

say, 2^128 ?

Aigneryu wrote on Jan 13^th, 2009, 11:49am:

My mistake. I just found it was my mistake. I put a upper bound on the parameter hidden somewhere in the long code.

I also confirmed that the integer can go up to 2^31.
Thanks.

Title: Re: maximum integer in verilog-A/AMS
Post by pancho_hideboo on Sep 18^th, 2010, 11:03pm

neoflash wrote on Sep 18^th, 2010, 10:35pm:

How can we enable a number even larger?
say, 2^128 ?

Treat it by four subblocks with 32bit bus width.

Title: Re: maximum integer in verilog-A/AMS
Post by neoflash on Sep 18^th, 2010, 11:22pm

Good idea.

I just did so for a 64/66 scrambler.