Re: Analog function question

From: Sri Chandra <srikanth.chandrasekaran_at_.....>
Date: Thu Sep 15 2005 - 17:03:15 PDT

In strict accordance to the BNF it cant be done yet. I think it was an oversight/bug in the BNF and the intent was to put it in there.

regards,
Sri

Muranyi, Arpad wrote:

Sri,

I just saw your 2nd reply, but since I had this almost finished,
I will send it out anyway...  So according to your 2nd message,
this can't be done (yet)?
----------------------------
Thanks for the quick answer.  Sorry, but I am still not sure
about it.  The sections you quoted from the LRM seem to allow
the array inside the function as a block item, but I still
don't see how I can pass an array into the function (and
pass it as a real variable array, not as a parameter array).

Would you be so kind and help me with an example?  If the
input "in1" is an array, how would you declare it in the
function?

analog function real myFunctionName;
input in1;
real  in1[1:5];    <--------- How would I know the size?
begin
...
...
end
endfunction


Thanks,

Arpad
============================================================

-----Original Message-----
From: Sri Chandra [mailto:srikanth.chandrasekaran@freescale.com] 
Sent: Thursday, September 15, 2005 4:36 PM
To: Muranyi, Arpad
Cc: verilog-ams@eda.org
Subject: Re: Analog function question

Hi Arpad,

Not sure why you think LRM doesnt support arrays. According to BNF (LRM 
2.2):

function_item_declaration ::=
input_declaration
| inout_declaration
| output_declaration
| block_item_declaration

block_item_declaration ::=
parameter_declaration
| integer_declaration
| real_declaration

And if you look at integer_declaration and real_declaration

integer_declaration ::= integer list_of_identifiers ;

real_declaration ::= real list_of_identifiers ;

list_of_identifiers ::= var_name { , var_name }
var_name ::= variable_identifier
                      | array_identifier array_range

(The above is also detailed in section 3.1)

cheers,
Sri

Muranyi, Arpad wrote:

  

I am just noticing (with disbelief) that analog functions
cannot take arrays as inputs (since I don't see any mention
of it in LRM v2.2).  Is this observation/conclusion correct?

analog function real maxValue;
input n1, n2 ;
real n1, n2 ;
begin
// code to compare potential of two signal
maxValue = (n1 > n2) ? n1 : n2 ;
end
endfunction

Is there a way to make "n1" and/or "n2" an array?

Thanks,

Arpad
===========================================================

 

    

-- 
Srikanth Chandrasekaran
Design Technology (Adelaide)
Freescale Semiconductor
Ph: +61-(0)8-8168 3592 Fax: x3201

Received on Thu Sep 15 17:03:25 2005