[vhdl-200x-ft] RE: Problem with FT04

David,

Aargh! I forgot about that. Actually, min is not a reserved word; it is a
declared name. Hence, it is a homograph of the function named min. That's
why you get the used-name conflict error: one use from std.standard and the
other from ieee.numeric_std.

I'd suggest the resolution is to choose different names for min and max.
Maybe minimum and maximum, though they're harder to type. Any other
suggestions?

Cheers,

PA

--
Dr. Peter J. Ashenden                        peter@ashenden.com.au
Ashenden Designs Pty. Ltd.                   www.ashenden.com.au
PO Box 640                                   Ph:  +61 8 8339 7532
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> -----Original Message-----
> From: David Bishop [mailto:dbishop@vhdl.org] 
> Sent: Thursday, 24 June 2004 02:20
> To: Jim Lewis; Peter Ashenden
> Subject: Problem with FT04
> 
> 
> In testing I hit the following:
> 
> Part of the FT04 proposal is the following function:
> 
>    function min (L, R: T) return T;
> 
> Seems simple enough.  In numeric_std I overload these for 
> "signed" and "unsigned".  Then I hit this
> 
> In package standard:
> 
>          type time is range -2147483647 to 2147483647
>                  units
>                          fs;
>                          ps = 1000 fs;
>                          ns = 1000 ps;
>                          us = 1000 ns;
>                          ms = 1000 us;
>                          sec = 1000 ms;
>                          min = 60 sec;
>                          hr = 60 min;
>                  end units;
> 
> Making "min" a reserved word!  So, I tried the following:
> 
>      constant delay : time := 1 min;     -- one minute delay
> begin
>      z := min (x,y)
> 
> and it gave me the following:
> 
> WARNING: test_minmax.vhd(19): Making two objects with the 
> name "min"  directly 
> visible via use clauses results in a conflict, neither object 
> is made directly 
> visible.(LRM Section 10.4)
> ** Error: test_minmax.vhd(19): Bad physical unit
> ** Error: test_minmax.vhd(19): Type conflict in integer 
> literal. Type time 
> versus integer.
> WARNING: test_minmax.vhd(27): Making two objects with the 
> name "min"  directly 
> visible via use clauses results in a conflict, neither object 
> is made directly 
> visible.(LRM Section 10.4)
> 
> 
> -- 
> David W. Bishop dbishop@vhdl.org       All standard disclaimers apply.
>