Uvm reg block. reg1。向写寄存器reg1,可以调用reg_blk.

• Uvm reg block Every register defined in UVM_REG_BLOCK gets connected to the corresponding HDLPATH in RTL. The vip is 64-bits data bus. ” I tried to use the static function uvm_reg_block::find_blocks() to get a register block by name without having to have a reference to the top-level register model, and discovered that it doesn’t return anything. My register block code (auto-generated by a tool) has a covergroup wrapped in a class and this class contains a sample method. add_hdl_path_slice("dut. Returns I want a handle of uvm_reg_block in uvm_reg as I want to write some different register from this reg_block . reg_mem_addr. Description: Represents a subset of registers within a block. parent: the block in uvm_reg_block : parent, uvm_reg_addr_t : base_addr, int : unsigned : n_bytes, uvm_endianness_e : endian, bit : byte_addressing = 1) Instance-specific configuration. g. The sequence flow: write via frontdoor and mirror via backdoor, then write via backdoor and mirror via frontdoor. The actual RAL model needs to be generated prior to running simulations using the regtool. I can’t seem to add the same registers to two maps. A block represents a design hierarchy. This post will explain how the register-access methods work. After that you can set the relative path to individual registers and you should be able to access the registers individually. A5 are reset by rst2. protected virtual task do_block( uvm_reg_block : blk) Test all of the registers in a given block. delete (); // Getting associated total registers with map maps [d]. hi, Im trying to integrate my ral files with environment i set this config db in top module. Let’s understand each of them in detail and how the UVM RAL model provides classes. bit [63:0] tests = UVM_DO_ALL_REG_MEM_TESTS The pre-defined test sequences to be executed. Hi Friends, in my previous posts on UVM RAL, we talked about “What is UVM RAL?” and “Why UVM RAL is needed? If you’ve not gone through those post, I’ll recommend you to visit those post if you are new to the UVM RAL domain. The my_test class contains an instance of the my_reg_block class, enabling the test to interact with the DUT's registers using the RAL model. function string get_root_sequence_name() You signed in with another tab or window. This section defines the base classes used for register stimulus generation. DUT”, “RTL”); uvm_reg_block model; body. 1 Class Reference is independent of any specific design processes and is complete for the construction of uvm_reg_block. In reply to VerifEx:. 引言 在UVM支持的寄存器操作中，有get、update、mirror、write等等一些方法，在这里整理一下他们的用法。 – of the uvm_reg_block virtual function void build(); begin reg_PRT_LCK_bkdr bkdr = new(); // Setting backdoor endfunction interface host_regmodel_intf; import uvm_pkg::*; // Tying the interface to the virtual // UVM reg backdoor infrastructure initial uvm_resource_db# UVMkit » 1800. So I want to know that how can I test a random register from each register block? Please help Hello everyone, I’m using the UVM cookbook code to set up memories for my environment. It's a good idea to place this model somewhere in the configuration database so uvm_reg_block model Block abstraction this sequence executes on, defined only when this sequence is a user-defined test sequence. thread #1 – APB monitor agent: task for collecting APB transactions. Let’s consider a DMA design which consists of registers in it and reg_interface is used to access the registers. I am able to generate functional coverage of the Register Model from test case. The register block itself also has as sample method that calls the covergroup::sample method. 2-2017 with the addition of API described below. I am providing the exact scenario below . Until now, the industry was solving such challenges by Hi, all. May also set a parent register file for this register, If the register is implemented in a single HDL variable, its name is completes after AXI VALID/READY handshaking. It can contain registers, register files, memories and sub-blocks. A register block is a higher-level abstraction that represents a collection of registers and memory-mapped elements within a digital design. // If ~hier~ is TRUE, recursively includes any sub-blocks. Do not confuse it with the build_phase of the uvm_component because the uvm_reg is not a uvm_component. It si the last line of the build function of the register block; (3) This is optional you can set the uvm_hdl_path for RTL and for GATE like this: add_hdl_path(“tbench_top. This is the scoreboard component that already creates the analysis fifos and queues for the agents passed via -ea switch. The UVM library provides the base classes for each of them as mentioned below. 4 (b) shows the multiple uvm_reg_maps structure described earlier. Understanding the intricacies of registers becomes paramount in the realm of System-on-Chip (SoC) and subsystem design verification. The following command will generate a SystemVerilog UVM REG model of the specified block in the file ral_blkname. If mem is specified, then the virtual register array is assumed to be statically implemented in the memory corresponding to the I have a situation where I have around 100000 registers in a uvm_reg_block. UVM Register Layer is also referred to as UVM Register Abstraction Layer (UVM RAL). A class, based on the uvm_reg_block class, models the all the registers and memories in the DUT. A4 and A. Slices must not overlap. add_reg(my_reg, 'h10); endfunction endclass some In reply to jacobi:. Using set_sequencer,you set that particular adapter,sequencer and that particular memory map for each adapter. While writing virtual sequence,you can take care such that write sequence will run on one sequencer In reply to soloist_huaxin:. Register blocks are used to organize registers into hierarchical structures. The UVM_REG combines elements from multiple proprietary solutions (e. demonstrate how, by using the UVM register abstraction layer (UVM_REG), sequences written for one block can be vertically reused. That means register model hasn’t been transfered into uvm_reg_hw_reset_seq. There is another virtual sequence library outside of the env which is also using same reg model for axi read/write. uvm_reg. parent: the block in extern static function uvm_reg_block find_block(input string name, input uvm_reg_block root = null, input uvm_object accessor = null); // Function: get_blocks // // Get the sub-blocks // // Get the blocks instantiated in this blocks. This allows the post_read methods to deal with clear-text data. HI , I have a requirement like test random one register from each register block . function void set_compare( uvm_check_e check = UVM_CHECK ) Sets the compare policy during a mirror update. env/i2c_host_scoreboard. // CLASS: uvm_reg_map // has below method to set sequencer and adapter associated with the map and // it must be called before starting any sequences based on uvm_reg_sequence. recv_fc_r, status, rd_data); Th For uvm_reg, it has include_coverage(). print(); This would print all details that have been provided via field utils. reg", 0, 1); OR uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent = null, string : hdl_path = "") Instance-specific configuration. Within The uvm_reg_predictor component is a child class of uvm_subscriber and has an analysis implementation port capable of receiving bus sequence items from the target monitor. Currently empty. The motivation for that was that the register package can already handle bus protocols that don't support burst operation, but it requires more user guidance for protocols that do support it. I want to create a top-level uvm_reg_block wrapper which instantiates multiple block-level uvm_reg_blocks for different interfaces, hence I need to set separate sequencer for each instance of the block-level uvm_reg_block. Introduction to UVM Register Model. Today, let’s delve into UVM RAL: What it is, its importance, and the structure it entails. uvm的常用方法及函数本节转自UVM——寄存器模型相关的一些函数0. A register file (uvm_reg_file) can contain registers and other register files. // In reply to VerifEx:. Below is the block diagram of DMA. Today, let's delve into UVM RAL: What it is, its importance, and the structure it entails. In Register Abstraction, This is an implementation of uvm_reg_block as described in 1800. Description: Represents a collection of registers and memories. Advantage – Simple implementation Disadvantage – It can not update the register model if register sequences are written to access DUT registers. As per standard UVM RAL methodology, I understand we need three separate uvm_reg_maps connected to three sequencers and drive. My way as follow: write_reg(reg_block_usrqp. class dut_reg_block extend uvm_reg_block REG0 reg0; REG1 reg1; REG2 reg2; REG3 reg3; endclass; support i have a function ConfigureDut(RegNum), and in it i want to access the register according RegNum(0~3), how to achieve this In reply to shahkavish77:. Synopsys RAL, and blocks, registers and their field derived from the uvm_reg classes uvm_reg_block. The code below is for setting up a memory, and my question is What is the definition of the “mem_offset_reg” and the “mem_range_reg”? These do not seem to be base classes and I cannot seem to find where these classes are defined in the cookbook or through uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent = null, string : hdl_path = "") Instance-specific configuration. ; Typically you reset your register model either in a reset phase of a test, where I think the easiest way would be using the set_hdl_path_root function of the uvm_reg_block to specify the absolute HDL path to the registers. Creating a UVM register block that is a sub-block of another UVM register block, when I call the configure function of the sub-block, I get this warning. Because it takes 32 bits (4 bytes), the next register REG_STAT would be at 0x4 and hold the design's extern function void configure (uvm_reg_block blk_parent, uvm_reg_file regfile_parent = null, string hdl_path = ""); // Function: set_offset // // Modify the offset of the register // // The offset of a register within an address map is set 1. Address maps are Use the uvm_reg_field::read() or uvm_reg_field::peek() method to get the actual field value. The RAL model fails to update if method returns UVM_NOT_OK status. Register fields are declared with uvm_reg_field class type. May also set a parent register file for this register, If the register is implemented in a single HDL variable, it’s generate the UVM Register Model from multiple other input specifications. specify their parent block and register file, and dynamically modify their offset within address maps. Don’t quote me on this, but I think the moment you instantiate your sub-blocks in your top level block and map the sub-maps in the big map, that will become the default map through which all register accesses are started, regardless of hierarchy. Similarly, a UVM_REG backdoor read would read the net value corresponding to the HDLPATH uvm_reg_block. uvm_reg_adapter adapter Adapter to use for translating between abstract register transactions and physical bus transactions, defined only when this sequence is a translation sequence. foo_regs" because of t uvm_reg_block：用于组织大量uvm_reg的大容器；也可以加入其它的uvm_reg_block，一个寄存器模型中至少包含一个uvm_reg_block。 uvm_reg_map：每个寄存器在加入到寄存器模型中都有其地址，uvm_reg_map就是存出这些地址的，并将其转换成可以访问的物理地址（因为加入到寄存器 I think the easiest way would be using the set_hdl_path_root function of the uvm_reg_block to specify the absolute HDL path to the registers. uvm_reg 的访问方法4. 1 uvm_reg的configure函数及源码(在uvm_reg_block的build函数内调用) (1) 通过调用uvm_reg的configure函数,在configure函数内调用m_parent. 1d: task uvm_reg_map::do_write(uvm_reg_item rw); uvm_sequence_base tmp_parent_seq; uvm_reg_map system_map = get_root_map(); uvm_reg_adapter adapter = system_map. The reversal of the invocation order is to allow the decoding of the data to be performed in the opposite order of UVM Register Abstraction Layer Generator User Guide 5-2020. Use seq. class my_reg_model extends my_abstract_model; // coverage, constructor etc // registers rand my_reg1 myreg1; rand my_reg2 myreg2; // builder extern virtual function void build(); endclass: my_reg_model. But it doesn’t work. enter image description here In reply to shreebamnikar:. Specify the parent block of this register. This class provides base functionality The register abstraction layer (RAL) of UVM provides several methods to access registers. add_hdl_path_slice(“reg_mem_addr”, 0, 32); (2) The lock_model() is missing. uvm_reg_mem_access_seq: Verify the accessibility of all registers and memories in a block by executing the uvm_reg_access_seq and uvm_mem_access_seq sequence respectively on every register and memory within it. The design essentially represents a traffic light controller which can be configured by writing into certain control registers. dv_base_reg_field It does not actually read the value of the field in the design, only the desired value in the abstraction class. A block can have one or more address maps, each corresponding to a physical interface on the This section describes how to construct a UVM register model for register and memory access. The semantics and layout of virtual registers comes from an agreement between the software and the hardware, not any physical structures in the DUT. The register map organizes the registers according to their designated addresses. See the description, methods and examples of uvm_reg_field, A register represents a set of fields that are accessible as a single entity. This is particularly useful for modeling complex designs with The following design has the following registers and fields that are accessible through an APB interface. In uvm_reg the registers can be contained in two entities: a register file or a register block. if I rely on reg_block ‘update’ method to do register write, it will look at m_desired and m_mirror. 1 uvm_re It recursively invokes the uvm_reg_block::sample_values() and uvm_reg::sample_values() methods in the blocks and registers in this block. parent: the block in “uvm_reg_block” can contain registers, register files, memories and sub-blocks. How to specify coverage models included in uvm_mem and uvm_reg_block? Can you show me an example? Thanks in advance. How UVM RAL works? By The Art of Verification July 5, 2021 May 17, 2024. Can any one help? The test sequence performs the following steps // // 1. virtual task body() Executes any or all the built-in register and memory sequences. but there is a problem: read via backdoor works well, but write via backdoor has no effect (uvm_is_ok but register’s value is not set). , 'HFHPEHU 2020 Verification Continuum TM 2 instantiates a set of uvm_reg objects modelling the registers of the actual Register map. when I try to add the sub block to both maps (using add_submap), I get The uvm_reg class, as the register abstraction base class, plays a crucial role in this process. Using create_map in uvm_reg_block, you can change the type of addressing scheme you want to use; namely This version of UVM reference implementaion includes an optional register block search by name optimization. Note that the name, build, is used for convenience. In addition, uvm_reg_block can also instantiate a memory model. Have a look at get_reg_by_name() in uvm_reg_block. I add a subblock of type uvm_reg_block named C to both using add_submap(see below) this. How to structure UVM RAL where Multiple interfaces on DUT have access to same set of registers in DUT (Ignore race conditions). I enabled the resource DB tracing and don’t Registers are then organized into blocks where a register map is also declared. usr_qp_ctrl_r. However, I want to apply cross coverage on the bins of ACCESS_ADDRESS_COMMAND_REG class and WRITE_DATA_REG class. Gaps may exist in the concatenation if portions of the registers are not implemented. We can customize our UVM register maps to add new functionalities, thus creating more complex and uvm_reg_block : parent, uvm_reg_addr_t : base_addr, int : unsigned : n_bytes, uvm_endianness_e : endian, bit : byte_addressing = 1) Instance-specific configuration. A block corresponds to a design component/hierarchy with its own interface (s), registers, register files, memories, and sub-blocks. I tried this: // TOP LEVEL REG BLOCK class top_level_reg_block extends uvm_Reg_block; virtual function void build() It recursively invokes the uvm_reg_block::sample_values() and uvm_reg::sample_values() methods in the blocks and registers in this block. If one of the other parameters are specified, the virtual register is assumed to be dynamic and can be later (re-)implemented using the uvm_vreg::implement() method. Will rollback the environment’s phase to the reset phase once the new phasing is available. Specify the parent block of this virtual register array. uvm介绍纯英文资料1. uvm_mem与uvm_reg的联系与差别 基本概念 寄存器块（reg_block）由包含很多的寄存器，也可以有存储器； 每个 Hi, I am having some issue on reg model access, here is the problem description. virtual function void set_sequencer ( `uvm_error(“uvm_reg_hw_reset_seq”, “Not block or system specified to run sequence on”); return; end endtask: body endclass: uvm_reg_hw_reset_seq. While playing with UVM_REG we noticed that the behavior of uvm_reg_map::get_reg_by_offset() is inconsistent. The reversal of the invocation order is to allow the decoding of the data to be performed in the opposite order of Main question- Where should I build the uvm_reg_block object in the UVM hierarchy so that the scoreboard can use it as a model and my sequences can use it to peek and poke the regs in the dut Longer backstory- I used Siemen’s Register Assistant tool to make a uvm_reg_block for all the registers in my design and I tested that it works- when I built it in the Properties of uvm_reg_field. Hi , I was going through UVM Cookbook :: Register Blocks. I don't expect any functional differences as I have encountered both previously. (2) register model并不会自动的进行reset操作,必须显式的调用reset函数进行复位操作. The decoded data is passed through each invocation in sequence. A1 and A. •The register model has two register variables: • Desired value: For when a field has been updated, but not the hardware • Mirrored value: Containing the latest known value • reg. The RAL model generated using the reggen tool extend from these classes. This incorrect full name causes issues when I try to use the uvm_reg_block class to access memory. // // When on is FALSE, bus reads and writes via this map do not // automatically update the mirror. For real-time updates to the mirror // in this mode, you connect a uvm_reg_predictor As I already mentioned, I gave a talk at DVCon Europe this year on how to implement burst accesses to memories modeled using UVM_REG. 前门访问和后门访问的比较寄存器模型的常规方法1. uvm_config_db#(reg_block)::set(null,“uvm_test_top”,“reg_model”,reg_model_v); Hi, We have a scenario, where the complete system has one uvm_reg_block. read method calls XreadX() method of the uvm_reg class, then a uvm_reg_item object will be created, which contains all the information for bus sequence. Can anybody give me some solutions? uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent, string : hdl_path = "") Configure a register file instance. It consists of all registers, maps, register files, and other register blocks if any. UVM Implementation – Register Block. “uvm_reg_block” can contain registers, register files, memories and sub-blocks. This method may be extended by the abstraction class generator to perform the required sampling in Hooks!&!Callbacks! • Field!base!class!has!empty!virtual(method(hooks( – implement!in!derived!field!to!specialize!behavior! • Callback!base!class!has!empty You can set the hdl path for the top most wrapper of the reg model. You need to explain more on what details you are looking for to seek more help. uvm-register-model, uvm-reg-model, UVM. Even if I give a wildcard for the name. Register Model. top_reg_block. The DV library classes fall into 3 categories - UVM RAL (register abstraction layer), UVM agent, and UVM environment extensions. It takes a string argument, so changing the register name won't break the compile (you have to take care of this at run time), but it's a good compromise (better than hardcoding address values). thread #2 – APB agent: task for detecting reset. The register Concatenation of HDL variables. Unless set to a different value using the uvm_reg_field::set(), the desired value and the mirrored value are identical. uvm_reg_block. And ral_block_traffic_cfg1 and ral_block_traffic_cfg2 extend from uvm_reg_block so since this is the parent type, I created an array of this type – spy_179. uvm_mem与uvm_reg的联系与差别 基本概念 寄存器块（reg_block）由包含很多的寄存器，也可以有存储器； 每个 BYTE or HALFWORD access. Ideally, I want the UVM RAL to print all uvm_reg_block, the uvm_reg in each uvm_reg_block and the detailed information associated with each uvm_reg e. Before diving into the register-access methods, let’s look at how a register value is stored. Elevate Your UVM Register Block Setup with the Visitor Pattern While reviewing the UVM reference manual, I came across a section titled "Traversal" in Chapter 29. Here's a code example of what I mean: class some_block extends uvm_reg_block; some_reg my_reg; virtual function build(); // default_map. Fig. uvm_reg_block : parent, uvm_reg_addr_t : base_addr, int : unsigned : n_bytes, uvm_endianness_e : endian, bit : byte_addressing = 1) Instance-specific configuration. Specify the parent block of this memory. I am trying to justify using uvm_reg_file but that will add an extra layer of hierarchy than if I just declare an array of the "uvm_reg" object inside the uvm_reg_block class. Each uvm_reg is composed of a set of uvm_reg_field, the leaf objects used to model bitfields in the Register map. start() instead. uvm_reg mimics the register inside the design. get_adapter(); uvm_sequencer_base sequencer = `uvm_error(“uvm_reg_hw_reset_seq”, “Not block or system specified to run sequence on”); return; end endtask: body endclass: uvm_reg_hw_reset_seq. First try would be ral_model. UVM RAL extensions. If the register file is instantiated in a block, regfile_parent is specified as null. Description: HI , I have a requirement like test random one register from each register block . From your example, I suspect that you wish to associate your callback class with a given register in a reg block, such as: uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent, string : hdl_path = "") Configure a register file instance. This is created for completeness. . DilipKumarErappa July 25, 2022, 1:34pm 1. How to connect sequencers to a single available bus adapter? How does the reg_model know that which master is accessing a register? Can we achieve this by having When user call the read/write task above, the register. block_level. virtual task body() Executes the Hardware Reset sequence. A dArray of uvm_hdl_path_slice specifying a concatenation of HDL variables that implement a register in the HDL. simply to initiate building sub-blocks, maps and regsiters within the model. the mirrored value in the register. If block_name is a member of the block you have a handle to, you would need to downcast it. parent: the block in Abstract — The implementation of UVM-RAL [1] verification environment which contains multiple processors or masters, and access the same registers (uvm_reg_block) with dynamic address mapping is a challenging task, especially when no standard solution is available in the traditional UVM. Introspection methods like “get_name”, “get_full_name”, and “get_parent” provide valuable information about the uvm_reg_maps structure to the portable block testbench, considering that a single uvm_reg_block can have multiple uvm_reg_maps, and each address map can have a different associated sequencer. One very nice feature of uvm_reg is the register callback extensions. add_reg(my_reg, 'h10); endfunction endclass some Hi John, The uvm_reg_cbs class can only be associated with uvm_reg, uvm_reg_field, uvm_mem, or uvm_reg_backdoor objects. Methods. 1. 4k次。1. A virtual register is a collection of fields, overlaid on top of a memory, usually in an array. Use the uvm_reg_field::read() or uvm_reg_field::peek() method to get the actual field value. 后门访问3. dut" ). ; A. class module_reg extends uvm_reg_block; rand ral_control_reg control_reg; rand ral_intr_sts_reg intr_sts_reg; rand ral_intr_msk_reg intr_msk_reg; rand ral_debug_reg debug_reg; `uvm_object_utils(module_reg) function new (string name uvm_reg has in-built methods called read() and write() to initiate a read and write operation to the design. The discussion will cover the definition of RAL, the reasons for Hello, I am attempting to use the uvm_reg_block class to create a block that contains a subblock. Dear All, For understanding UVM RAL MODEL Especially BACKDOOR ACCESS, I was make a simple example as the below link. It comp To enable auto prediction: Call set_auto_predict() method. Ready to use. Hierarchical Simulation: Memory Example • uvm_reg_map provides view into subsystem, multiple uvm_reg_map captures different views • Memory driver are provided with the subsystem environment env_b begin : M_OCRAM_DRV_MEM_MAP m_env_b_mem_map. A2 are reset by rst1 as well register B. The registered callback methods are invoked in reverse order of registration before all the post_read methods are called. I have a question about mirror value updating. My parent block has 2 maps. 1 uvm_re 文章目录基本概念寄存器模型的集成访问寄存器的方式1. created a complete other block and and pulled in all maps and submaps and registers, but got stuck with similar errors: “reg Hi, I’m looking to selectively turn off checking on read for certain registers belonging to a register map I have defined using uvm_reg_map. This thread will affect only the internal logic of the APB agent and one of the actions which will do is to stop thread #1 and restart it. mirror、desired 和 actual value2. Do not call directly. May also set a parent register file for this register, If the register is implemented in a single HDL variable, its name is Instance-specific configuration. For example, you can set the block-level path as jb_reg_block. uvm_reg的函数及作用 4. Reference to uvm_reg_block. I need to get sub blocks of only the From UVM documentation, get_blocks(blks, UVM_NO_HIER); should do I have generated Register Model using Register Assistant Tool of Mentor Graphics. BYTE or HALFWORD access. For register access, can’t we proceed without RAL? Yes, we can. Using create_map in uvm_reg_block, you can change the type of addressing scheme you want to use; namely uvm_reg_block model; tests. you mean you dont like typing. Small code snippet for single register covergroup as shown below: Class register0_reg extends uvm_reg; `uvm_object_utils(register0_reg); rand uvm_reg_field port; I'm using a uvm_mem object (myMem) created/built inside a uvm_reg_block (myRegblock) and assigned to a uvm_reg_map (myRegmap), however the uvm_reg_block has no default_map object, instead it has multiple uvm_reg_map objects all named something other than default_map. I looked at the implementation and it’a doing a regex lookup in the uvm_resource_db. // if set marks the uvm_reg_map_info as initialized, prevents using an uninitialized map (for instance if the model. theRal_block. May also set a parent register file for this register, If the register is implemented in a single HDL variable, its name is In reply to desperadorocks:. I’ve: created another map and adding registers to it, but it won’t allow it. Before a uvm_reg::write // or uvm_reg::read operation returns, the register's uvm_reg::predict method is called to update. Figure 1. 2 Class Reference represents the foundation used to create the UVM 1. write() • Access the hardware register and update the register database • Front door access uses bus agent – takes time and may create side effects extern static function uvm_reg_block find_block(input string name, input uvm_reg_block root = null, input uvm_object accessor = null); // Function: get_blocks // // Get the sub-blocks // // Get the blocks instantiated in this blocks. Sets the compare policy during a mirror update. UVM. A question that came up Hello, I have a set of registers which are instantiated to an address map in uvm_reg_block. a component. ; Register B has fields B1 and B2. Slices must be specified in most-to-least significant order. A block has one or more address maps, each corresponding to a physical interface on Learn how to model and verify registers and memory-mapped structures using UVM register classes. A register may be mapped to one or more address maps, each with different access rights and policy. This register file class is instantiated inside a uvm_reg_block class type. resets the DUT and the // block abstraction class Step #2 – Instantiate the Registers in a Register Block. The fields are configured in the build function. uvm_reg_file. Data decode. These blocks are then instantiated in a uvm_environment or the uvm_test depending on preference. extern protected function uvm_reg_cvr_t build_coverage(uvm_reg_cvr_t models); // Function: add_coverage // Specify that additional coverage models are available. 2 Class Reference, but is not the only way. If the bit in the written value is a 1, This primer is designed to teach how to create a register model of the registers and memories in a design, how to integrate this model in a UVM verification environment and how to verify the The reg block is written by extending the uvm_reg_block. The optimization if enabled caches the results of uvm_reg_block::find_blocks() function to avoid repeated searching of entire register model in case the same name is searched for multiple times. I have a uvm env which is integrated with axi vip to drive the transactions and also sequences interacting with reg model. This method may be extended by the abstraction class generator to perform the required sampling in Write a register block (derived from uvm_reg_block) that captures all the registers. The register uvm_reg_block : parent, uvm_reg_addr_t : base_addr, int : unsigned : n_bytes, uvm_endianness_e : endian, bit : byte_addressing = 1) Instance-specific configuration. Hi all, There is one problem about using read_reg(frontdoor way) and peek_reg(backdoor way) disturbing me. It calls model. reset_blk. Hi Jonathan_Alvarez, Without going to deep into the code these helper tasks seems interesting, but I was under the impression that the UVM register layer was intended in a higher abstraction level in which you don’t deal with addresses but with register names, maybe I’m wrong, but anyways just my two cents about your intention, and In reply to soloist_huaxin:. You signed in with another tab or window. You switched accounts on another tab or window. get_field_by_name(). Is it fine if I create a new map and add these registers. uvm_reg_block : blks[$]) Get the all root blocks. I see there is a function called set_check_on_read() but looks like this will disable checking for all registers in the map. B= Data decode. However, when I go to do a myMem. What I wanted to know is, if the register present in “My_reg_block” is RO, How that particular register is updated with a value present in the register(RO) of the DUT since it is RO. read (status, rd_val, maps [d]); // Do necessary operation Register Model. 寄存器模型的reset (1) 每一个register model被继承到验证平台后,都必须进行reset操作,这样才能保证每个寄存器的值等于我们设置的初始值. set_hdl_path_root("top_tb"); individual register . I do such works. Another solution, is to extend IP reg block and create duplicate maps, size of this duplicate map will be controlled at higher levels and do a Today, let's delve into UVM RAL: What it is, its importance, and the structure it entails. Based on its definition each register may have one or more uvm_reg_field. uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent, string : hdl_path = "") Configure a register file instance. Configures this map with the following properties. How will reg map work as they have 1 sequencer per reg map. The UVM Register Layer provides a standard base class libraries that enable users to implement the object-oriented model to access the DUT registers and memories. This is the simplified code of do_write from UVM-1. The UVM 1. As an alternate solutions, we have developed methods which will create a duplicate uvm_reg_map for any given uvm_reg_map. field name/field width/register address etc. Verify the accessibility of all registers in a block by executing the uvm_reg_single_access_seq sequence on every register within it. Verify the accessibility of all shared registers and memories in a block by executing the uvm_reg_shared_access_seq and uvm_mem_shared_access_seq sequence respectively on An address map is a collection of registers and memories accessible via a specific physical interface. I think it’s not possible as you can have only one set of sequencer and adapter associated with a register map. In uvm_reg, get_full_hdl_path returns the type shown below: function void get_full_hdl_path ( ref uvm_hdl_path_concat paths[$], input string kind = “”, input string separator = “. In the testcase, it has some 64-bits registers in DUT and by using synopsys AXI4 vip to write data into them. The field value is checked against its mirror only when both the check argument in uvm_reg_block::mirror, uvm_reg::mirror, or uvm_reg_field::mirror and the compare policy for the field is UVM_CHECK. read in my testcase, I get a UVM_WARNING: uvm_reg_block model Block abstraction this sequence executes on, defined only when this sequence is a user-defined test sequence. Add a comment | -1 It is because uvm_reg_block class is extended from uvm_object and build is not a function in uvm_reg_block class. Reload to refresh your session. virtual task reset_blk In reply to Deepak M:. reset() method in uvm_reg_hw_reset_seq in RAL? I see based on the comments the sequence does the following. While writing virtual sequence,you can take care such that write sequence will run on one sequencer 文章浏览阅读6. A register block (uvm_reg_block) can contain registers, register files, memories and other register blocks. The discussion will cover the definition of RAL, the reasons for Hi, I need help in getting the functional coverage for register model. reg1,write()方法。那还存在别的友好的方法开获取RAL模型中某个寄存器的句柄吗，毕竟如果整个RAL模型存在上百个寄存器 what is the use of model. Provided you should define two memory maps in the ral model and in the environment with two adapters. In reply to shreebamnikar:. // While playing with UVM_REG we noticed that the behavior of uvm_reg_map::get_reg_by_offset() is inconsistent. May also set a parent register file for this register, If the register is implemented in a single HDL variable, it’s Hello, I am trying to add a uvm sub block to my existing reg block. svh and Hi Janick, At page 656 of the UVM1. // Declaration uvm_reg_map maps [$]; uvm_reg regs [$]; uvm_status_e status; // Getting number of maps associated with block handle blk. This thread usually affects the register block by updating and checking the registers values. block. Register A has fields A1, A2, A3, A4, and A5. The register model or RAL blocks consists of register files, registers, memories, maps, and other blocks. uvm_reg_block model; body. I generated Register model package and covergroups for each register using the Register Assistant tool from Mentor Graphics. This is just a fancy name for saying that you can set some action to be executed when a register field is accessed (e. This belongs to the register model. body. Address maps can be composed into higher-level address maps. Description: uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent = null, string : hdl_path = "") Instance-specific configuration. function uvm_sequence_base get_root_sequence() Provides a reference to the root sequence (the top-most parent sequence). It recursively invokes the uvm_reg_block::sample_values() and uvm_reg::sample_values() methods in the blocks and registers in this block. Commented Jul 20, 2022 at 17:32. In this section will see an example that shows one of the ways to access DUT registers with the UVM RAL Model. What you can also do is define your own "indirect data register" class that is more tailored to your situation: class some_indirect_data_reg extends uvm_reg_indirect_data; ctrl_reg ctrl; data0_reg data0; data1_reg data1; // override configure function void configure (ctrl_reg ctrl, data0_reg data0, data1_reg data1, uvm_reg_block blk_parent, uvm_reg_file regfile_parent = In reg block, get_full_hdl_path returns a string. I know that the default size is 64 and we have to do +define+UVM_REG_DATA_WIDTH=2048 when compiling UVM. add_mem (. Hello, there could be multiple ways you can achieve the same results: by default the uvm reg sequences have a special continue check mechanism used in the body where they check if the specific uvm reg has the flag uvm_no_[ral_test,ral_write_test] if those flags are set to 1 then it will continue from the for each used to run through all the In reply to Jonathan_Alvarez:. do_block. Does the below code work, class xxx_reg_block extends uvm_reg_block; reg_a_c reg_a; reg_b_c reg_c; function new(); uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent = null, string : hdl_path = "") Instance-specific configuration. So I want to know that how can I test a random register from each register block? Please help 文章目录基本概念寄存器模型的集成访问寄存器的方式1. Is there anything similar to this to disable a specific register? Thanks and the Accellera UVM_REG register and memory package can provide it. When user call the read/write task above, the register. The discussion will cover the definition of RAL, the reasons for its necessity, and an overview of the UVM RAL framework design. Is it possible to create a cover group in pcie_block class In a previous post I described all the steps that you have to take in order to start a register model using uvm_reg library. virtual function uvm_reg_map get_root_map() Get the externally-visible address map. 2 User’s Guide. uvm_reg_block is the topmost hierarchy, usually, uvm_reg_block has an instance of all the registers (uvm_reg) or it may have an instance of other uvm_reg_block. Thus, I need multiple maps for multiple adaptors. The uvm_mem class does not have a mirror of the actual memory. These themselves extend from the corresponding RAL classes provided in UVM. </p><p> In reply to chr_sue:. function uvm_reg_map create_map(string name, // Name of the map handle uvm_reg_addr_t base_addr,// base address int unsigned n_bytes, // access width in bytes uvm_endianness_e endian, // endianess of the map bit byte_addressing=1); " The byte_addressing argument affects how the address is I have a top level uvm_reg_block with 2 maps, A and B. This guide is a way to apply the UVM 1. uvm_reg_block : blk) Reset the DUT that corresponds to the specified block abstraction class. Both interfaces should see consistent information. get_block_by_name() returns a handle to a uvm_reg_block base class. class ral_control_reg extends uvm_reg; rand uvm_reg_field rsvd; rand uvm_reg_field parity_en; 1. Hi, next problem is related to the sequencer which is used in do_write. ralf The generated code is not designed to be read or subsequently manually modified. *" after the end of the register full name in the concatenation If bit-type resource named “NO_REG_TESTS” or “NO_REG_HW_RESET_TEST” in the “REG::” namespace matches the full name of the block 在UVM寄存器模型中,调用uvm_reg_block::lock_model完成整个RAL模型的生成，整个时候整个寄存器scope的地址也已经生成了，比如有下面的层次化结构 reg_blk. Specify the parent block and register file of the register file instance. If the field is write-only, the desired/mirrored value is the value last written and assumed to reside in For example, REG_CTL could be placed at an offset address of 0x0 to emphasize that it is the main control register for the module. 3 A register and register map being created within a register block. But in reg2axi_adapter module, it has “virtual function uvm_sequence_item reg2bus(const ref uvm_reg_bus_op rw)”, the rw. The sytem has two masters driving and accessing any registers at any point of time, but only sequentially. This allows you to get a register inside a block (hierarchically) without knowing the exact hierarchical path. You probably don’t have a sequencer set for this map. I have instantiated reg model in env. 1) Instantiate my_reg_block in env to avoid instantiating my_reg_block twice if it is instantiated in reg_seq_a and reg_seq_b. While there’s no include_coverage() for uvm_mem and uvm_reg_block. I have multiple level of register sub-blocks(from different IPs). I want to allow multiple interfaces to access the same memmap. read() and reg. 2uvm_reg介绍2. get_registers (regs); foreach (regs [k]) begin regs [k]. n_bits is 32 bits only, so when I write 64-bit data into register in dut, it has twice write operations, one is for uvm_reg_block : parent, string : hdl_path = "") Instance-specific configuration. Yeah you can do it. I am running into such a problem. The name of the register model class is technically arbitrary but it is recommended that it reflect the name or type of the model. Conclusion. When we do RAL based verification, we have a “uvm_reg_block” from where “My_reg_block” extends, Now My_reg_block contains the Registers that are present in the DUT. I have this working when I use either auto-predicition or I have a top level uvm_reg_block with 2 maps, A and B. virtual task reset_blk In reply to jacobi:. get_maps (maps); foreach (maps [d]) begin regs. 1 class reference spec, 25. 4. In my environment I have total 100 registers and 10 register block. reg1。向写寄存器reg1,可以调用reg_blk. Back-door is preferred, so you need to define a user-defined backdoor access by extending the uvm_reg_backdoor class and implementing the write() method to write to the memory model as required. So I read cookbook and I came to know that I can test a register by using uvm_single_reg_bit_bash_seq. I’m confused with this issue. By using the “frontdoor” mechanism to convert from abstract memory operations to physical bus transfers, the same memory sequences can be plugged into multiple verification environments. It will work. 19. Accellera believes standards are an important ingredient to foster innovation and continues to encourage industry innovation based on its standards. This is the UVM reg based RAL model. uvm_reg_field. Each field of the register is defined as a uvm_reg_field (line 4 to 7). UVM_WARNING @ 0 ns: reporter [uVM/RSRC/NOREGEX] a resource with meta characters in the field name has been created "regs. write(); People really want a new API for that oneline statement ? I'd be happier if you said lets get rid of all the *by_name() API's and ensure people use object referencing. mem(m_ocram_drv_mem), reg layout: reg0: 0x10 reg1: 0x14 reg2: 0x18 reg3: 0x20 and i use an autotool to generate uvm_block like following. reg. A UVM_REG backdoor write would deposit the values directly on HDLPATH connected to that register instance. There is one WO register to verify. I have two user-defined reg sequences(reg_seq_a and reg_seq_ which both include the user-defined reg block(my_reg_block). If this memory is implemented in a single HDL variable, it’s name is specified as the hdl_path. Can anybody give me some solutions? A similar declaration is made for the RW register, declared as my_reg_Ra and the register model which extends uvm_reg_block In this example, we define a my_reg_block class that extends uvm_reg_block to represent the DUT's register block. The UVM application programming interface (API) defines a standard for the creation, integration, and extension of UVM Verification Components (UVCs) and verification environments that scale from block to system. B= uvm_reg_block model Block abstraction this sequence executes on, defined only when this sequence is a user-defined test sequence. How will reg predictor work/get expected values. The code below is for setting up a memory, and my question is What is the definition of the “mem_offset_reg” and the “mem_range_reg”? These do not seem to be base classes and I cannot seem to find where these classes are defined in the cookbook or through I want to use the get_reg_by_name() API to get the registers instantiated inside a register file class extended from uvm_reg_file. recv_fc_r, status, data); peek_reg(reg_block_usrqp. set_hdl_path_root( "fullchip. reset() method, but i coudn’t actually see how it actually drives the reset. add_reg函数, 将uvm_reg加入到uvm_reg_block中; (2) 一般地,假如整个寄存器中只有一个字段的话,会在 调用这个寄存器的 configure函数时,指定此寄存器的hdl路径,这个路径 Hello, I am unable to compile my register model using registers of size 2048 bits. 前门访问2. this is achieved by setting the bit_addressing=0 field in the uvm_reg_block::create_map function. 2 uvm_reg_hw_reset_seq, it mentioned it should use the following ". The hdl_path is Hello everyone, I’m using the UVM cookbook code to set up memories for my environment. Let’s assume we have a register block called reg_block and it contains 2 registers A and B. Step #2 – Instantiate the Registers in a Register Block. Now I want to add these registers to another interface with separate address map. This method may be extended by the abstraction class generator to perform the required sampling in Hi all, I try to check backdoor access to all the registers in my reg_block by the uvm_reg_access_seq. adapter. User is verifying 32 bit registers and the design also allows the BYTE (8 bits) and HALFWORD (16 bits) accesses. Hi I'm playing with a UVM Register example that initially just had register level coverage. virtual function void set_sequencer ( uvm_reg_block : blk_parent, uvm_reg_file : regfile_parent = null, string : hdl_path = "") Instance-specific configuration. The user-defined register block is derived from uvm_reg_block. Customizable. 4. Here is class ral_control_reg I 'd like to setup and want to access parity_en, dbg_en and mod_en register field by using BACKDOOR access. You will have to load it via a front-door or back-door method that you need to define. You signed out in another tab or window. A3, A. During the following internal calls, reg2bus() method in uvm_reg_adapter will be called to translate register access into bus sequence. Does anyone know if there is a built-in function (or some other ways) in the UVM RAL that can print out these information? Kind regards, Po Exploring the Essence of UVM RAL. Each design block has its own uvm_reg_map, and uvm_reg_maps for all IPs inside the A similar declaration is made for the RW register, declared as my_reg_Ra and the register model which extends uvm_reg_block The UVM 1. set_hdl_path_root( "dut" ), whereas you can set the chip-level path as something like jb_reg_block. Description: Represents individual registers. After I use the uvm_reg_block method "configure" to set the parent of the subblock to block, the "get_full_name" method for the subblock begins to return incorrect names. env/i2c_host_reg_block. The model of the RECIPE register is defined by extending the uvm_reg class. prediction的分类3. sv: Command: % ralgen –l uvm -u –t blkname blkname. 1verification-methodology-reference1. uvm_reg_field represents the field of the register. clear field A when field B is written with value 1). A= create_map(“A”, UVM_REG_ADDR_WIDTH'h0, 4, UVM_LITTLE_ENDIAN, 1); this. Hello, there could be multiple ways you can achieve the same results: by default the uvm reg sequences have a special continue check mechanism used in the body where they check if the specific uvm reg has the flag uvm_no_[ral_test,ral_write_test] if those flags are set to 1 then it will continue from the for each used to run through all the What you can also do is define your own "indirect data register" class that is more tailored to your situation: class some_indirect_data_reg extends uvm_reg_indirect_data; ctrl_reg ctrl; data0_reg data0; data1_reg data1; // override configure function void configure (ctrl_reg ctrl, data0_reg data0, data1_reg data1, uvm_reg_block blk_parent, uvm_reg_file regfile_parent = Have a look at get_reg_by_name() in uvm_reg_block. 2-2020. I have three drivers that can drive transactions to these registers. uxsqoz bfkrms tgkz zsa fwtoos dhd rltsmm wmccl tsx yef