RE: [sv-bc] modport_identifier in an assignment

But a modport does not introduce a nested hierarchical scope. We don't
refer to sb_intf.slave.data or a.slave.data, just sb_intf.data or a.data
(from that same example)

 

Dave

 

 

________________________________

From: owner-sv-bc@server.eda.org [mailto:owner-sv-bc@server.eda.org] On
Behalf Of Brad Pierce
Sent: Tuesday, April 24, 2007 11:37 PM
To: sv-bc@server.eda-stds.org; sv-ec@server.eda-stds.org
Subject: Re: [sv-bc] modport_identifier in an assignment

 

Dave,

 

A reference to an interface instance is parsed with
hierarchical_identifier.  For example, 

 

              ordered_port_connection  ::= expression ::= primary ::=
hierarchical_identifier ::= 'sb_intf.slave'

 

-- Brad

 

________________________________

From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of
Rich, Dave
Sent: Tuesday, April 24, 2007 9:31 AM
To: sv-bc@eda-stds.org; sv-ec@eda-stds.org
Subject: [sv-bc] modport_identifier in an assignment

I've been looking through the BNF and can't find anywhere the BNF allows
you to put . modport_identifier next to an interface instance on the RHS
of a assignment. The RHS could be either an actual argument in an
argument/port list or in the assignment to a virtual interface variable.

 

For virtual  interfaces, there's no reason to add this capability other
than for redundancy, since in order to select a modport, the target must
have been declared with the specific modport_identifier. There's no BNF
to support the example in 20.8 (draft1) where there is a
modport_identifer in the assignment:

 

v32_phy = p32.phy;

 

For interface port connections, we have this feature where you can
specify the modport_identifier in the actual port when there is no
modport declared in the formal port. (See the example in 20.4.3) But I
can't see any BNF to support this syntax:

 

memMod mem(sb_intf.slave); // Connect the modport to the module instance

cpuMod cpu(sb_intf.master);

 

 

 I'd be happy to remove the feature.

 

Dave

 

 

David Rich
Verification Technologist
Design Verification & Test Division
Mentor Graphics Corporation
dave_rich@mentor.com
Office:   408 487-7206
Cell:     510 589-2625

 


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