Modports in interfaces Key Components of an Interface: Modports: Define the direction (input, output, or inout) of signals in the interface. Abstract The SystemVerilog adds various kinds of the port connection enhance-ments, interfaces and the modports. Abstract— System verilog interfaces and structs have many useful benefits in RTL design, but they have not been readily adopted due to limited support by the EDA vendors. Modport lists with directions are defined in an interface to impose certain restrictions on interface access within a module. modports are declared inside the interface with the keyword modport. It has two modports with the name driver and monitor. It provides a more explicit control of signal directionality, further enhancing code reliability and readability. but when synthesizing designs that contains modport, the Quartus Using SystemVerilog Interfaces and Structs for RTL Design Tom Symons and Nihar Shah Oracle Labs Examples for Interface,modports and virtual interface in SystemVerilog #vlsi #verification #coding Members only We_LSI 3. e. They are used to declare the direction of data flow through module ports, which many simulation tools ignore. Aug 12, 2008 · But to answer your question; yes the interface can have a lot of clocking blocks especially if you are doing source synchronous design. 9 Virtual interfaces and 25. I didn’t realize you were doing this in your first post. Feb 3, 2021 · If you choose to use a clocking block as the only mechanism for accessing signals in your interface, then you'll have to create another clocking block. I can get the test bench to work without an interface by declaring all the signals as reg and wire within the test bench normally but I wanted to use an interface with tasks, functions, etc. A clocking block defined between clocking and endcocking does exactly that. 5. It may be that the LRM failed to clearly explain their intent. I really like them. The driver so created shall have (strong1 , strong0 ) drive strength and shall be updated as if by a continuous Jul 21, 2016 · In reply to saritr: If interfaces Modports are not supported by synthesis, just stick to regular SystemVerilog types of module interfaces (i. A clocking block is used inside the interface to ensure that all the signals are sampled properly. If the design doesn't structurally need aggregation of input/output signals why not just have inputs in one struct and outputs in another to get a less complicated code which is supported by most synthesis tools (interfaces are not fully supported on some yet). I have an interface (called `axi4lite`) with two modports defined: `master` and `slave`. I would discourage the use of nested interfaces as there is no way to control access via modports. My situation is I need to simulate the AXI Interface with Interface AXI_BUS on top module. 🔹 Interfaces – help bundle related signals for cleaner Bare logic inside a interface is supported by the standard, however exposing such logic (i. It gets some time, but you get used to it. That way you won’t have to hardcode paths. can we do something like below. You can think of a modport the same way a module provides a port declaration list as its “boundary” for connections. My question fundamentally is The interface example shown above has the same modports and methods as mailbox FIFO version shown in Example 23. Aug 11, 2024 · One or more modports in an interface to which the virtual interfaces from the class-based hierarchy are connected. I believe the easiest way of doing Jan 31, 2023 · However, the LRM says this about modports in a virtual interface declaration. Any help appreciated, thank you! The Interface can have any number of modports, the wire declared in the interface can be grouped in many modports Modpports can have, input, inout, output, and ref One, Declaring modport Below code shows the declaration of modport inside the interface. In many cases, just two modports, or views, are needed - One for the source-side of the interface, and one for the sink-side. axi_aclk (axi_master [VHDL2019 Feature Request] Interfaces VHDL 2019 adds Interfaces, similar to interfaces and modports in SV, which are already supported. Dec 27, 2022 · A modport is an access privilege list, not a hierarchical scope. com Abstract—Explores the benefits and limitations of SystemVerilog interfaces and modports in block-level design. dut) would be made. axi_aclk (axi_master May 25, 2025 · Discover how to effectively implement and use System Verilog interfaces with modports in different module files without the need for imports. Modports allow you to assign different directions to signals within an interface, making it easier to connect components and manage signal connections in complex designs and testbenches. If my understanding is correct, if it's an input to the DUT, then it's an output for the interface and if it's a o/p for dut then its a input for the interface I see you are driving wire d but not using it anywhere In Topmodule, instead of passing modport in the argument, can you try declaring separate members of the interface with corresponding modports and pass them? Sep 21, 2016 · Does Quartus's integrated synthesisor actually support modport in interface of SV? A clocking block is a set of signals synchronised on a particular clock. Therefore the interface can be configured and connected to modules in the same way as shown Example 24, in section 3. , int, logic,), and when instantiating the module, make port associations to the interface instance. 6 For each clocking block output whose target is a net, a driver on that net shall be created. 5 Modports) restricts illegal access, like driving a signal by a driver where the modport declares that signal as an input to the driver (it should be an output of the driver). You would have to separate the config db for each modport . Synthesis tools sometimes only look at portions of the design hierarchy and need direction information at the boundaries they are analyzing. It basically separates the time related details from the structural, functional and procedural elements of a testbench. verif_learner1 May 28, 2018, 2:47pm 3 In reply to dave_59: Jan 23, 2009 · You will only get one virtual interface, top_if. When I instantiate them into my logic, I have something as follows: axi4lite axi_master(); Module1 DUT1 ( . Apr 8, 2017 · SystemVerilog interfaces have really simplified my FPGA designs. Feb 16, 2023 · What are Interfaces? SystemVerilog interfaces were developed to allow for easier connectivity between hierarchies in your design. And I also need the C variables to access the Interface modports. In the following example interface contains a single field 'data'; modports create two views: data is input Towards a Practical Design Methodology with SystemVerilog Interfaces and Modports Jonathan Bromley SystemVerilog Interfaces & Modports | Simplifying Connectivity in Testbenches In this video, we explore one of the most powerful features of SystemVerilog—Interfaces and Modports. initiator if1 ); endmodule And interface itself looks like - interface dut_if ; logic req; logic gnt; modport initiator {output req, input gnt}; modport responder {input req, output gnt}; endinterface If I have write a SVA module with some properties, conventional wisdom says In SystemVerilog, you can define tasks within an interface and control their access using modports. Would it be able to get any information what I have to see for further feature enhancement Introduction to AXI Interface in SystemVerilog The Advanced eXtensible Interface (AXI) is a widely adopted interface protocol used in System-on-Chip (SoC) designs. I'd like to replace multiple signal mappping on my top testbench with only several modports in my dut. Within an interface to declare port directions for signals modport is used. 🔹 Interfaces – help bundle related signals for cleaner Dec 26, 2022 · Logic is recommended because inside interface signals can act as both as input and output. Interfaces are hierarchical structures that can contain other interfaces. i want to have the seperate virtual interfaces for master and slave intity. However, when you connect the interface to the DUT, you want to connect the top level signals. The most obvious function of modports is to cause an error/warning if you connect Confused about why interfaces were introduced in SystemVerilog? 🤔 This video will walk you through everything—from the chaos before interfaces to the structured clarity they bring to modern Mar 6, 2012 · A big problem with modports and virtual interfaces is that some simulators have failed to implement all the required checks (only read modport input variables, etc. This will be a monitor clocking block and hence no driving of the clocking block. Jul 10, 2022 · What should be the specified port directions of signals in an interface, how do you specify it with what reason? This is not about port directions of the modports, but about signals inside the interface which could then be a part of the modports. I **BEST SOLUTION** SystemVerilog clocking blocks within an interface are used to describe timing, and how/when a testbench should drive/monitor signals on the interface. mp master_vif; virtual slave. Module ports and interfaces by default do not specify any timing requirements or synchronization schemes between signals. Hi All, I'm new to using interfaces and would like to implement an interface that connects a master module to 2 other identical slave modules. Sep 21, 2016 · I have read Quartus Help, and it says the Modports in interface is not supported. Interfaces also facilitate design re-use. [A3] As I said in [A1], modports are mainly for RTL. 7K subscribers Subscribe Jul 13, 2015 · We would like to show you a description here but the site won’t allow us. 2 : Interfaces and Modports in Systemverilog Systemverilog Academy 16. I prefe Abstract—Explores the benefits and limitations of SystemVerilog interfaces and modports in block-level design. The point of modports is to create a specific view of interface signals for a particular module. My understanding is only at this basic level - we don’t want both TB and DUT driving a signal inside the interface, leading to an “x”. Interfaces can also include functionality like tasks, functions, and modports, making them highly versatile for Exploring SystemVerilog Essentials I recently prepared a presentation on Interface, Modports, and Clocking Blocks in SystemVerilog. A modport (1800’2017 25. We have assertions defined within our interfaces, but we pragma them out for synthesis (synthesis translate_off/on) Does logic always infer a register in an interface? Clocking block can be declared in interface, module or program block. Jun 23, 2015 · They allow for the definition of different views of the signals within the interface. 10 Access to interface objects of the IEEE 1800-2017 LRM. May 20, 2020 · When instantiating, I tried using the full modport name, the full modport name with the instantiated interface, and a few others, but nothing seems to work. bromley@doulos. Mar 26, 2014 · The ModelSim errors, together with this quote from the 2012 standard "To restrict interface access within a module, there are modport lists with directions declared within the interface. However, robust support for two of the most interesting features of interfaces (modport expressions and the creation of modports inside a generate construct) is available only in a much smaller set of tools. The interface simply contains a 2 bit data bus that is driven by the master. We used SystemVerilog interfaces and structs in our recent project, and we have recently taped out a chip with some modest usage of these in RTL. But when I use the interface without modport, I can use it inside UVM components. May 14, 2015 · If I define a modport that specifies a subset of the signals in the interface, does that mean that if I use it to connect modules, then only that subset should physically exist at that connection? Jul 7, 2021 · This chapter discusses nuances of SystemVerilog “interface,” including modports (import/export), tasks/functions in an interface, parameterized interfaces, etc. They define access rights to a bundle of signals, and you cannot change the modport type one it is passed into the module. I’ve read your paper on testbench DUT connection and am trying to apply much of that methodology to my problem but the example DUT has output wires. me/vlsipoint SystemVerilog is a hardware description and verification language . 1 Example of named port bundle Not supported 25. The LRM shows parameterized interfaces passed to modules, but only using the generic interface. Modports are like sub-types passed through an interface port. Jun 24, 2022 · The module I'm testing is, probably obviously, in a different file. What you can do is pass the full interface (without modports Modports How to define modports for DUT, driver, and monitor Exposing only required signals (e. , reset and clockvars) Preventing direct access to interface signals from testbench components Enforcing clean access patterns through virtual interfaces Aug 28, 2019 · I realize I didn’t include the problem. ), removing much of their value to the user. Regarding modports, just try both options (master, slave) with a tool which would complain if you did it wrong. Can be used to create different views of the interface, allowing […] Jun 16, 2020 · most tutorials show that dut(clk_if. Without modports, interface connections have universal access to all things defined in interface. I have tried the connections with modport and it throws errors saying illegal use of modport and sometimes unconnected interface. Clocking blocks are most often used inside an interface. OK, it is possible to use modports and define in a modport only applicable elements for a certain module. Any help appreciated, thank you! Modports How to define modports for DUT, driver, and monitor Exposing only required signals (e. Mar 17, 2019 · You can't use modports in your top-level module port declaration unless they are going to be connected to the same modport in the lower level modules. Clocking Blocks in Modports The modport construct can also be used to specify the direction of clocking blocks declared within an interface. This is no good for RTL writing. 21K subscribers Jun 10, 2022 · What is a Modport in SystemVerilog? Modports. Clocking block is usefull only for writing testbenchs. Mar 31, 2008 · Well, since VHDL does not support the concept of interfaces, you can only bind to ports of an interface, which are treated just like ports of modules. Then take all the clocking blocks that go together for an interface and make them modports. 3. In later stages we will learn about the modports and clocking blocks which will help in understanding this concept. I would like the interface to split the bus such that one slave is driven by the LSB and the other slave is driven by the MSB of the bus. This would allow test writers to focus more on Jun 11, 2020 · The SystemVerilog adds various kinds of the port connection enhancements, interfaces and the modports. I’m trying to bind an inout wire port of the interface to this output logic on the module. axi_aclk) ); Module2 DUT2 ( . They can also be used to show intended usage. However, your interface can still have modports that could be used in the virtual interface used to connect to a class based environment. On the other hand, if you put all of them into an interface and connect a whole interface to a module, you get a warning for each unused element. Instead of having to define many pins on each module, they are defined once in an interface, and then the interface is defined on the module instead of pins. Two questions, please help : Do I really need modports? Simple explanation of the “need Interface and Modport in SystemVerilog Interfaces in SystemVerilog simplify the process of connecting multiple modules by grouping related signals into a single construct. May 18, 2024 · Explore the role of Interfaces and Modports in simplifying complex System Verilog designs with our expert insights. K. mp slave_vif; Thanks Jan 29, 2019 · The issue is with how you connect the interfaces to the DUT. That was a minimal example to demonstrate the problem your tools are having with interfaces, wires, and modports. But most people have given up using modports for verification because even in the case you show, it's very easy to access the entire interface. 5 Modports Not supported 25. Synthesis tools have chosen not to support them, but there is nothing unsynthesizable about them. ” A module doesn’t know the concept of modports for instance. Jul 7, 2021 · This chapter discusses nuances of SystemVerilog “interface,” including modports (import/export), tasks/functions in an interface, parameterized interfaces, etc. Why do we need clocking block in SV? Exploring SystemVerilog Essentials I recently prepared a presentation on Interface, Modports, and Clocking Blocks in SystemVerilog. They reduce wiring complexity and improve code readability, especially in designs with numerous signals. Identifies key problems of portability, re-use and flexibility in interface-based design, and suggests a methodology for adoption May 22, 2018 · A SystemVerilog interface is a bundle between the DUT and the testbench. output : Ports that need to be output. Its actually the below modports in interface definition modport MSTMODEL (clocking master_cb); modport SLVMODEL (clocking slave_cb); text-align:left; IEEE Subsection Construct Description 25. Clocking blocks are important for simulation Oct 17, 2023 · To my knowledge interfaces were non existing in Verilog Standard, so my question would be: within which context was renaming in modports existent in verilog? Q2. Modports in SystemVerilog are used to restrict interface access within a interface. LRM 14. Sep 24, 2022 · begin //end end I checked that the clk_reset interface ports are working (all outputs). If the set of signals is SystemVerilog Interfaces provide a powerful and flexible way to encapsulate multiple signals and clock/reset signals into a single unit. May 23, 2018 · In reply to verif_learner: It always helps to see the declarations of everything involved. A interface file can consit of ports, modports, clocking blocks and internal signals as shown in example. jonathan. I've not tried such flows. Modports can have input : Ports that need to be input. Apr 12, 2024 · Regarding the use of tasks and functions in an interface modport, you can certainly make them accessible using an import. This enhances design modularity, reusability, and testability. Sep 4, 2025 · A modport is a construct inside an interface that defines the direction of signals for a specific module that is connected to it. Inside an interface / function, is there a way to know which modport is calling the function (given that the modport has access to it to begin with)? Oct 3, 2013 · Hi, I am new to UVM. They allow me to route many signals to multiple blocks in logical groupings. In an interface port or virtual interface variable declaration, designating a modport is a requirement for access. master. It specifies which signals are inputs, outputs, or inouts for a particular module, providing fine-grained control over how different modules interact with the interface. Jan 3, 2017 · Hi users, I am new to UVM and learning a thing or two at a time. What Are Interfaces? For your interface-based design to be synthesizable, you should define modports. input : Ports that need to be input. So, intf. A modport in System Verilog defines the access rules for an interface. how to do same. In this scenario, the chapter discusses about the module instantiation, interfaces, modports, semaphore and the mailboxes. They primary purpose of an interface is to provide connection between different modules, in other words, to be passed as ports to modules. Clocking blocks can only be declared inside a module, interface or program. Example : Simple Interface @90ns Write access address 00, data 24 @170ns Write access address 01, data 81 @250ns Write access address 02, data 09 @330ns Read access address 00, data 24 @410ns Read access address 01, data 81 Aug 28, 2016 · Modports are used to specify the direction of signal with respect to a specific module/component. Nov 4, 2023 · Among these features, interfaces play a crucial role in creating modular, reusable, and efficient designs. clk signal is 'x' in the mem module. If you use interfaces in RTL, synthesis tools require modports. Modports define a subset of signals for access, as well as their direction. 4 Ports in interfaces Supported 25. i want to have a read only mode, that means that for mod port: readonly the signal “ wr ” will always be to ground/low, because i want to completly avoid a module with a read only interface to do anything else but read. inout : Ports that need to be inout ref : Ports that need to be ref. Modports can have. Dec 30, 2022 · Improve your design and testbench efficiency with modports in SystemVerilog interfaces. A virtual interface declaration may select a modport of an interface in which case the modport is also part of its type. ---This video is A modport expression allows elements of arrays and structures, concatenations of elements, and assignment pattern expressions of elements declared in an interface to be included in a modport list. The interface has to be used by sv modules in other files. Clocking blocks also suffered from poor specification in the LRM and were only recently cleared up in the 1800-2009 LRM. This paper discusses the benefits of SystemVerilog interfaces and structs in I am using SystemVerilog interfaces/modports to simplify module connection logic. Usually clock and reset are defined as ports of the interface. via modports) for the synthesizer would be weird. Well of course that code synthesizes fine, it does nothing. Implementing AXI interfaces in SystemVerilog using interfaces and modports enhances code Jan 27, 2023 · Modports are mostly required by synthesis tools when using interfaces. You should use clocking blocks if you feel it necessary to group signals with direction. Jan 22, 2017 · Can someone give me a hint as to why this interface with modports and clocking blocks might not work? interface axis (input logic aclk ); logic [15:0] tdata_s; logic tvalid_s; logic SystemVerilog “interface” Introduction This chapter discusses nuances of SystemVerilog “interface,” includ-ing modports (import/export), tasks/functions in an interface, parameterized inter-faces, etc. I want to know if we use modport of an interface to connect a DUT and UVM test component. virtual master. We would like to show you a description here but the site won’t allow us. I use them with modports to indicat Jan 21, 2013 · Modports in SystemVerilog are used to restrict interface access within a interface. Identifies key problems of portability, re-use and flexibility in interface-based design, and suggests a methodology for adoption of SystemVerilog interfaces and modports that helps to solve these problems in synthesizable designs. The keyword modport indicates that the directions are declared as if inside the module. So I am curious if there is a clever way I can have multiple instantiations of some_block, each taking a different generated modport. One way to think of them is as collections of pins that are common to many modules. The modport also put some restrictions on interface access. I can call out the signal name to map directly to the interface ports, but I think I can take advantage of modport, especially when I have multiple signals for a particular group. In larger projects the inability of the tools to properly handle interfaces, modports, and wires, leads to problems; but I'm not linking 20+ files in a forum post. Modports are just restricted access rights when declaring interface ports or virtual interface variables, or making assignments to them. Essentially you can always make interface type assignments from an unrestricted interface instance to a modport restricted port or variable Mar 1, 2018 · Modports have nothing to do with timing - they are access lists. g. Dave Mar 10, 2008 · Now I see the SV manual says that if you define a task as extern in an interface, you can import or export it via modports to other classes/modules. Can someone confirm that modports aren't the way to go here? Feb 18, 2024 · Join our Telegram group for more discussion and get some outstanding materials for exams and interviews: https://t. Mar 12, 2012 · Ooops!! There was a typo in my last post. How do I pass some interface's signals into another interface (module)? Oct 26, 2019 · I have read a lot about modports on various sites, but I am not clear on how exactly they help restrict access in an interface where signals are inout by default. The (input|output) directive in a clocking block is not a port direction, but a keyword to the tool to let in know you're desribing a sampling (input), or driving (output) time. They are also used to restrict access to certain signals from some modules/classes. 3 Example of connecting Feb 25, 2022 · I want to have the system verilog interface in a seperate file with different modports. Mar 5, 2016 · Similar to just using a generic interface reference (line commented out)? I find it a bit weird as the compiler doesn’t even know that ex_if is an interface at the moment it compiles dut_wrapper. Nov 20, 2023 · interface, SystemVerilog-modport, SystemVerilog stefaniemcg November 20, 2023, 3:46pm 1 I want to write a memory iterface with different modports. For example: I am attempting to generate a series of modports within an interface as follows:<p></p><p></p><p></p><p></p><code>interface main_bus (); logic [15:0] ack; logic [12:0 Jul 10, 2010 · Hi, I've recently started using SystemVerilog and I wish to use a generic memory interface in some of my modules, in order not to tie their use to a given particular memory or system bus, in a way that I could simply bind adapters to the top of the module hierarchy and let it roll with whatever m Jul 19, 2017 · I guess this feature seems outdated features, and I would love to contribute for simulating above. You will able to reference if1 and if2 through through top_if. Clocking is used on Interfaces are a major new construct in SystemVerilog, created specifically to encapsulate the communication between blocks, allowing a smooth refinement from abstract system-level through successive steps down to lower RTL and structural levels of the design. They determine which signals an interface port has access to from within the module they connect to. Here is a snippet of my source file. Jul 16, 2021 · Interface “myif” has a module instantiation which is not allowed. It is a collection of signals synchronous with a particular clock and helps to specify the timing requirements between the clock and the signals. If the modport only allows the clocking block and not the signal, you cannot access the signal directly. Obviously the LRM doesn’t allow this so I’m looking for another solution. axi_aclk (axi_master. Producers can use output tasks to send data, while consumers can use input tasks to receive data. In this scenario, the chapter discusses about the module instantiation, Current Status Interfaces are supported, at least to some extent, by a wide range of SystemVerilog simulation and synthesis tools. Just like packages can be imported into module fil Course : Systemverilog Verification 2 : L5. An interface instance or virtual interface with no modport selected may be assigned to a virtual interface with a modport selected. There are many advantages (reusability and encapsulation) of using interfaces but limitations as well even if they are considered “like a module” they cannot fully used like a module. An example of a VHDL 2019 Interface is: -- A FIFO like streaming interface: type StreamingIf is record Valid : Std_uLogic; Data : Std_uLogic_Vector (7 downto 0); Ack : Std_uLogic; end record StreamingIf; Towards a Practical Design Methodology with SystemVerilog Interfaces and Modports Jonathan Bromley Doulos Ltd Ringwood, U. Regards May 21, 2021 · In system verilog, it's common to have interfaces that just connect nets, in this case, there would be no way to not get this warning, even if all nets were connected in lower level modules even if modports attached to all nets. Advantages of the interface example An interface is a bundle of signals or nets through which a testbench communicates with design Jul 13, 2019 · I see different examples online of using modports for interfaces when there are port inputs on the interface. Modports Modports in SystemVerilog are used to restrict interface access within a interface. Think of it as defining a specific “plug” or “perspective” on the interface. Jun 11, 2025 · Interfaces Modports Miscellaneous Interface Features Packages SystemVerilog Constructs Mixed Language Support Introduction Mixing VHDL and Verilog Instantiation Instantiating VHDL in Verilog Instantiating Verilog in VHDL Instantiation Limitations VHDL in Verilog Acceptable Example Unacceptable Example Verilog in VHDL VHDL and Verilog Libraries Sep 17, 2023 · In the reference manual it is mentioned that the port directions (in modport) are as seen from the module. Dec 22, 2024 · Modports are design constructs and shouldn’t be used for verification. An SV interface can have multiple Can I use a nested interface in place of a modport? The purpose of this is large-scale interconnect of many different modules while taking advantage of interfaces to simplify connectivity. When you make a connection SystemVerilog interface is a collection of port signals - Learn more about SystemVerilog interface with simple examples - SystemVerilog Tutorial for Newbies Nov 28, 2016 · A modport is like a sub-interface to an interface connection. It facilitates high-performance, high-frequency system designs by providing a flexible, pipelined communication structure between components. Apr 28, 2025 · I’ve recently discovered that adding a Clocking Block into an interface, and having the clocking block drive an output is akin to adding a driver to that interface signal. As with other modport declarations, the directions of the clocking block are those seen from the module in which the interface becomes a port. Why do we need clocking block in SV? Dec 26, 2022 · Logic is recommended because inside interface signals can act as both as input and output. " kind of suggest that modports aren't really intended to be used in classes. What is the module here? Does it mean the interface in which the modport is specified or does it mean the module w&hellip; I had trouble with interfaces initially, since they look like a module and connect like a port. Should modports include clk and reset on the modport even though they are interface inp Apr 1, 2023 · It looks like you are confused about interfaces. Consider for example a loadable DUT counter where data_in is the load Mar 6, 2025 · Given that a DUT uses a modport in its interface definition shown below - module DUT ( input clk, input resetn, dut_if. These are the powerful constructs which are used during the design and verification. The Modport groups and specifies the port directions to the wires/signals declared within the interface. Learn how this powerful feature can streamline your work. In this blog, we will delve into the world of System Verilog interfaces, covering concepts such as interface bundles, modports, clocking blocks, and clocking blocks II. SystemVerilog Interface. This is explained in section 25. Clocking block declaration clocking cb @(posedge clk); default input #1 output #2; input from_Dut; output to_Dut; endclocking Clocking block terminologies Clocking event The event specification used to synchronize the clocking block, @ (posedge clk) is the clocking event I am using SystemVerilog interfaces/modports to simplify module connection logic. I normally don't use modports in verification interfaces, but you would have to add the clocking bock to your existing modport or add another one. Modport Flexibility: The use of 'modports' in interfaces allows the definition of different roles for modules that are using the same interface. Jan 12, 2014 · I want to bind the interfaces of some sub-module and write assertions and protocol checkers. But, the problem is that the output clock signals from clk_reset can't reach the mem module by interface. Nov 16, 2020 · Hi, Is it possible to use modports in testbenches along with virtual interfaces ? Thanks Jul 16, 2013 · Modports were primarily added to SystemVerilog for Synthesis tools. It helps the designer develop testbenches in terms of transactions and cycles.