Subject: interface gate restriction
From: Rick Reed TSE (rickreed#tseng.co.uk)
Date: Wed Jan 24 2001 - 20:50:49 GMT
In 8.1.6 Gate Concrete Textual Grammar there is a condition:
"The <interface identifier> of an <textual interface gate definition> must
not identify the interface implicitly defined by the entity to which the
gate is connected (see 12.1.2)."
I do not understand why this restriction exists:
a) the implicit interface does not define an implicit gate (not that I could
find in Z.100 - if I am wrong please point out where this is defined);
b) in any case, another interface can be defined that inherits the implicit
interface, which would have the same effect;
c) the restriction does not exist for <graphical interface gate definition>;
d) it would be possible to define a named gate with the interface as a
signal list.
Perhaps it was intended the implicit interface defines an implicit gate
(with the same name as the interface, which is the same name as the entity).
However, in this case the restriction is not needed, because there would be
a clash of names if an explicit definition is given.
Does anyone have an explanation, what this condition is for?
As the gate is not implicitly defined, it seems reasonable that it should be
allowed to explicitly define such a gate.
-- Rick Reed - rickreed#tseng.co.uk Tel:+44 1455 55 96 55 Fax:+44 1455 55 96 58 Mob.:+44 7970 50 96 50
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