[sv-bc] RE: SV 2009 configs -- index expressions in hierarchical names

The history seems to be that first the line

"Index expressions in a hierarchical name shall only refer to literals or localparams of the configuration."

was there, and then later the line

"Hierarchical references cannot include scopes of generate or array of instances."

was added.

Similarly, the early versions of the proposal did not yet include a BNF, only after the new restriction was added.

Apparently, no one noticed that the first restriction seems to have become irrelevant.

Note that in Mantis 2565, Surya asked,

"'- Hierarchical references cannot include scopes of generate or array of instances.'
Is the "hierarchical references" referring parameter override expression or instance hierarchical reference? Please give some example."

Regards,
Shalom


> -----Original Message-----
> From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of
> Brad Pierce
> Sent: Saturday, December 01, 2012 22:59
> To: sv-bc@eda.org
> Subject: [sv-bc] SV 2009 configs -- index expressions in hierarchical
> names
> 
> According to 33.4.3, "Index expressions in a hierarchical name shall
> only refer to literals or localparams of the configuration." But Syntax
> 33-4 doesn't allow index expressions in hierarchical names. As
> mentioned in http://www.eda.org/svdb/view.php?id=986 , "The LRM does
> not mention about configuring instance arrays and generated
> instantiations. Also, as per the BNF (Syntax 13-6), it is illegal to
> configure an element of an instance array/generate block because
> 'inst_name' can contain 'instance_identifier', only."
> 
> This restriction doesn't seem to be talking about the param_expression
> in the named_parameter_assignment, because another restriction in the
> same list is, "Hierarchical references cannot include scopes of
> generate or array of instances."
> 
> -- Brad

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