RE: [sv-bc] Re: Out-of-bound index for part select on concatenation

Hi, in Draft 8, 11.5.1 says,

"Bit-selects extract a particular bit from a vector, packed array, packed structure, parameter, or concatenation...If the bitselect is out of the address bounds or the bit-select is x or z, then the value returned by the reference shall be x."

and

"A part-select that addresses a range of bits that are completely out of the address bounds of the vector, packed array, packed structure, parameter or concatenation, or a part-select that is x or z shall yield the value x when read and shall have no effect on the data stored when written. Part-selects that are partially out of range shall, when read, return x for the bits that are out of range and shall, when written, only affect the bits that are in range."

Shalom
 

> -----Original Message-----
> From: owner-sv-bc@server.eda.org 
> [mailto:owner-sv-bc@server.eda.org] On Behalf Of Surya Pratik Saha
> Sent: Friday, December 19, 2008 10:52 AM
> To: sv-bc@eda.org
> Subject: [sv-bc] Re: Out-of-bound index for part select on 
> concatenation
> 
> I am sorry, LRM indeed allows bit select too. But my 2nd 
> question is still valid.
> 
> Regards
> Surya
> 
> 
> 
> -------- Original Message  --------
> Subject: Out-of-bound index for part select on concatenation
> From: Surya Pratik Saha <spsaha@cal.interrasystems.com>
> To: sv-bc@eda.org <sv-bc@eda.org>
> Date: Friday, December 19, 2008 2:18:38 PM
> > Hi,
> > In 1800-2009 draft LRM, a new construct is added as part select of 
> > concatenation. Is there any reason for which bit select is not 
> > allowed. For e.g.
> > {a, b}[2]
> >
> > Also, LRM does not mention what will happen if out-of-bound 
> index is 
> > used in the part select expression. For e.g.
> > {a, b}[-1:2]
> > Whereas, -1 is an invalid index here. Can anyone explain on that?
> >
> 
> 
> 
> 
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