From: Marq Kole <marq.kole_at_.....>
Date: Thu Nov 16 2006 - 00:28:49 PST
Geoffrey,
> things like
> if (myParam == "nmos")
> since both sides would be (converted from string literal to)
> the same 24-bit integer value.
I would say that the string "nmos"
would be converted to a 32-bit integer value.
If these string literals are converted
to packed arrays of 8 bits, are these 24-bit and 32-bit integers interchangeable
with ordinary integers?
Cheers,
Marq
Marq Kole
Competence Leader Robust Design
Research
NXP Semiconductors
"Geoffrey.Coram" <Geoffrey.Coram@analog.com>
Sent by:
owner-verilog-ams@server.eda.org
15-11-2006 15:21
To
Dave Miller <David.L.Miller@freescale.com>
cc
verilog-ams <verilog-ams@server.eda-stds.org>
Subject
Re: Why is type for string parameters
mandatory?
Classification
Dave -
If you did
parameter myParam = "abc";
and AMS didn't disallow this, it would still have to convert this
to a 24-bit integer. I guess you would still be able to test
things like
if (myParam == "nmos")
since both sides would be (converted from string literal to)
the same 24-bit integer value.
I would say, though, that AMS allows you to do
parameter string myParam = "abc";
since it extends digital 1364, and also you should be able to
use the == and != operators, I don't think they're restricted
to the analog block.
-Geoffrey
Dave Miller wrote:
>
> Okay so Shalom's comment that parameter myParam = "abc"
declares a 24bit
> vector makes sense as to why it works in digital. I just looked at
it as
> they have allowed string parameters without declaring the type which
was
> not quite right.
>
> Digital explicitly disallows me to declare a string parameter as:
> parameter string myParam = "abc";
>
> Analog currently explicitly disallows me to declare a string parameter
as:
> parameter myParam = "abc";
>
> Because parameters are at module scope and hence domain less (well
thats
> how I look at them) this creates some conflict if I happen to want
to
> use the same parameter in both domains.
> The biggest use I am seeing for string parameters today in my work
is in
> test benches where they are being used for error messages and to store
> the filename of a file to be used in a $fopen() statement.
>
> Dave
--
Geoffrey J. Coram, Ph.D. Senior CAD Engineer
Analog Devices, Inc. Geoffrey.Coram@analog.com
804 Woburn St., MS-422, Tel (781) 937-1924
Wilmington, MA 01887 Fax (781) 937-1014
Received on Thu Nov 16 00:36:49 2006
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