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Error - Sv-uip Unconnected Interface Port

Coverage Questions Coverage - Active Coverage - Solutions Coverage - Replies Coverage - No Replies Ask a Coverage Question Additional Forums AMS Downloads Announcements Quick Links Coverage Forum Search Forum Subscriptions they can be 'no connects') Using Cadence irun, I get this warning when I don't connect inputs to the interface: ncelab: *W,CUVWSI With tasks/functions, I can have a default value You would instantiate this wrapper in your wire harness, but then you would have to make sure to pass the actual interface in your agents. dlong Full Access203 posts May 14, 2008 at 2:13 am Hi jgg, Thanks for sharing your approach - it does seem to work OK for my examples too with Questa 6.3f

Several functions may not work. Thanks. Only an individual array word can be assigned to. The spec, and VCS, say it's illegal to haveunconnected ports of type interface.

Your reply works. In one case I have a family of about a dozen name compatible interfaces with slightly different properties (like bit widths/etc) that can be used interchangeably with a generic family of At its simplest, an interface is a named bundle of wires, similar to a struct, except that an interface is allowed as a module port, while a struct is not.

  1. Only the variables or nets declared in the port list of an interface can be connected externally by name or position when the interface is instantiated, and therefore can be shared
  2. They can help build applications such as functional coverage recording and reporting, protocol checking and assertions.
  3. Please do letme know whether your mailID is proper or not as mentioned here.
  4. Here it is again:$ nchelp ncelab CUINMDnchelp: 06.11-s003: (c) Copyright 1995-2007 Cadence Design Systems, Inc.ncelab/CUINMD =        This is an incompatible connection.  A Verilog interface must be connected        to a port of
  5. for example, reg[7:0] data[0:127] data[0:127] = $get_data(arg...) is this possible?
  6. I abandoned this approach since it was not supported by other simulators either.
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Modern high level language design has been moving in a direction that magic concepts are bad for a long time. it seems to have issues only while connecting it using for generate construct. > > But I agree that your code looks OK. > > I have had endless trouble with They encapsulate functionality, isolated from the modules that are connected via the interface. Last post on 22 Aug 2007 1:06 AM by archive.

And I couldn't find out where exactly I was wrong. UVM brings clarity to the SystemVerilog language by providing a structure for how to use the features in SystemVerilog. What's Needed to Address the Problem? The compiler needs the type information in order to generate code around those references, and it doesn't know without very expensive analysis that the code is unreachable.

You will also likely want to get the array word size. Regards, Dave jggForum Access25 posts May 13, 2008 at 2:13 pm dlong wrote:This would build OK but give a run-time error when the interface was accessed since the virtual interface specialisation Overview Related Products A-Z Tools Categories Library Characterization Tools Virtuoso Liberate Characterization Solution Virtuoso Variety Statistical Characterization Virtuoso Liberate LV Library Validation Solution Virtuoso Liberate MX Memory Characterization Solution Virtuoso Liberate Who We Are Subject Matter Experts Contact Us Announcements Verification Horizons Blog Academy News Verification Horizons The Verification Horizons publication expands upon verification topics to provide concepts, values, methodologies and examples

On the negative side, there does seem to be a danger that functionality that belongs in the class-based environment could "slip" into the interface instead, limiting reuse. More Help Here we exchange ideas on the Cadence Academic Network and other subjects of general interest. To be really useful, the classes that contained the virtual interface had to be parameterised too. I'm surprised I haven't hit the above bug (I hope you filed a bug report :)), but I've been using parameterized interfaces quite a bit and the working approach I use

This example includes modports, which are used to specify the direction of the signals in the interface. For example, the design model (i.e., DUT) can be mapped into a hardware accelerator and run much faster during verification, while the testbench continues to run in simulation on a workstation. Probably the most prevalent form of formally specifying design intent in the digital verification domain is through the use of properties, which can be implemented as either assertions or cover properties. Thank you for your replies.

The tasks are called inside the testRAM module: interface MSBus (input Clk); logic [7:0] Addr, Data; logic RWn; task MasterWrite (input logic [7:0] waddr, input logic [7:0] wdata); Addr = waddr; If you pass the array as an argument to $get_data() you can access the individual array words along with the other information needed to fill the words as you like. They can be used for port-less access: An interface can be instantiated directly as a static data object within a module. This was a pain and unmanageable.

The other issue is that since modules and interfaces do not support inheritance, creating a set of SV interfaces with additional "interface methods" (in the Java/C++ sense) could be a lot I was hoping there would be a Cliff or Stu paper, but could not find one. Latest Issues June 2016 March 2016 November 2015 June 2015 March 2015 November 2014 June 2014 March 2014 October 2013 June 2013 February 2013 Issue Archive October 2012 June 2012 February

However, in many cases UVM provides multiple mechanisms to accomplish the same work.

The UVM Academy Courses provide a great overview of the introductory and advanced methodology concepts, including videos that walk you through some useful code examples.

Courses Introduction to the UVM Basic I am fully aware of > the standard Verilog command '$time' > and specifically may I know if taking > time-stamps before start of an operation > and immediately after the Logged warnerrs Senior Community Member Posts: 107 Hero Points: 4 Re: V20: User Defined Error Parsing not working « Reply #4 on: November 16, 2015, 10:00:36 pm » Had to delete Here is an example showing an interface with a clock port: interface ClockedBus (input Clk); logic[7:0] Addr, Data; logic RWn;endinterfacemodule RAM (ClockedBus Bus); always @(posedge Bus.Clk) if (Bus.RWn) Bus.Data = mem[Bus.Addr];

Is there a way to use user_data field to bypass array > > to verilog? This is most helpful when you have multiple slaves and you want coverage or checking on each slave DUT.There's loads more reasons, but those are a good start :)Originally posted in dlong Full Access203 posts May 13, 2008 at 2:09 am Hi Pieter, Thanks for sharing that. This lets all the drivers/monitors use any interface that is member name compatible and thus provides something kind of like polymorphism for interfaces.