Uvm Reg Read

uvm_reg A register represents a set of fields that are accessible as a single entity. A register may be mapped to one or more address maps, each with different access rights and policy. Summary Initialization new Create a new instance and type-specific configuration Creates an instance of a register abstraction class with the specified name. Use the uvm_reg_field::read () or uvm_reg_field::peek () method to get the actual field value. If the field is write-only, the desired/mirrored value is the value last written and assumed to reside in the bits implementing it. Although a physical read operation would something different, the returned value is the actual content. get_mirrored_value

uvm_reg_read_only_cbs Pre-defined register callback method for read-only registers that will issue an error if a write () operation is attempted. Summary Methods pre_write Produces an error message and sets status to UVM_NOT_OK. add Add this callback to the specified register and its contained fields. remove uvm_reg_sequence This class provides base functionality for both user-defined RegModel test sequences and "register translation sequences". When used as a base for user-defined RegModel test sequences, this class provides convenience methods for reading and writing registers and memories.

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[1] The user calls the read () method. [3] The read () method calls the XreadX () method of the uvm_reg class. The XreadX () method creates a uvm_reg_item object corresponding to the read. [4] The XreadX () method calls the do_read () method of the uvm_reg class.

you can call register reads and writes from any component. You have to set up the reg model correctly and pass the handle to the component. My guess is the register model is not fully set up correctly (either you don't have a handle to the reg model or there is an incorrect setting with respect to the predictor, adapter, sequencer, etc. ).

The register model has methods to read, write, update and mirror DUT registers and register field values, these methods are called API (application programming interface). APIs can either use front door access or back door access to DUT registers and register fields.

The ctl register contains fields to start the module, and configure it to be in the blink yellow or blink red mode. The state register is read-only and returns current state of the design - yellow, red or green. The two timer registers stores the time between transition from each state.

From the UVM users guide, a register read access can be executed as reg_model.BLK1.REG_FILE1.REG_1.read (status, rdata); But this mandates us to know the hierarchy of the register instantiation. ie., 'reg_model.BLK1.REG_FILE1' needs to be known to execute a read on register 'REG_1'.

A register model is an entity that encompasses and describes the hierarchical structure of class objects for each register and its individual fields. We can perform read and write operations on the design using a register model object. Every register in the model corresponds to an actual hardware register in the design.

There are essentially four components required for a register environment : A register model based on UVM classes that accurately reflect values of the design registers An agent to drive actual bus transactions to the design based on some protocol An adapter to convert the read and write statements from the model to protocol based bus transactions

After successful operation data values should be written or collected in obj object In adapter class (reg2bus is updated for write and bus2reg is updated for read) All the information about transaction is available in reg2bus except data in case of read. adapter class uvm_reg_item start_reg; int burst_length; burst_class adapter_obj;

UVM RAL Model creation involves the below steps, Writing register classes Writing register package Instantiation of register classes in register package Writing Adapter class Integrating register package and adapter in environment Accessing registers with RAL Writing register classes Writing reg class for INTR

virtual task post_read(uvm_reg_item rw); endtask // Task: pre_write // // Called before user-defined backdoor register write. // // The registered callback methods are invoked after the invocation // of this method. // // The written value, if modified, modifies the actual value that

There are essentially four components required for a register environment : A register model based on UVM classes that accurately reflect values of the design registers An agent to drive actual bus transactions to the design based on some protocol An adapter to convert the read and write statements from the model to protocol based bus transactions

[Regmodel] read register via map regmodel.spi_rf.register = `h42 (message is printed from uvm_reg.svh -- line no 2299) From what i understand [Regmodel] message is controlled from the stimulus side and [Regpredict] message is controlled from the monitor side. The model is only updated when the [Regpredict] happens. Is my understanding correct?

There's a field set inside the register model ( uvm_reg::m_is_busy) during the read of regmodel.REGA. That field is checked by uvm_reg::do_predict (). If m_is_busy is set high when the predict begins, you'll get that "Trying to predict value of register regmodel.REGA while it is being accessed" message.

uvm_reg_predictor parameterized with the my_transaction_class. Eventually, the structure that is created looks similar to the diagram, below.. READ virtual task read( output uvm_status_e status, output uvm_reg_data_t value, input uvm_path_e path = UVM_DEFAULT_PATH, input uvm_reg_map map = null, input uvm_sequence_base parent = null, input.

UVM also allows backdoor accesses which uses a simulator database to directly access the signals within the DUT. Write operations deposit a value onto the signal and read operations sample the current value from the register signal.

I am looking for a way to add always an additional uvm_reg write access when I read or write to an uvm_reg. The flow is shown in the pseudo code. pseudo code: reg_map.MY_REGS.REG1.write ( status, <my data >); This should always be : reg_map.MY_CTRL_REG.CFG ( status, <data> ); reg_map.MY_REGS.REG1.write ( status, <data> );

Accessing registers from TestCase. In this section will see an example that shows one of the ways to access DUT registers without the UVM RAL Model. Let's consider a DMA design which consists of registers in it and reg_interface is used to access the registers. Below is the block diagram of DMA. UVM RAL Example. Below are the DMA registers, INTR.

hi, registers are rather "dumb" containers of register fields and there might not be a single access policy for a register. fields (uvm_reg_fields) carry most of the functionality in UVM_REG. in order to learn the access policy of the field you can query via somefield.get_access(map). since the effective access policy depends upon the uvm_reg_map used for a potential access you may pass the.

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. 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. A question that came up afterwards on the conference floor was what.

The uvm_register_frontdoor looks like a normal uvm_sequence apart from having the uvm_reg_item rw_info that holds information about the register access. Like if the access is read or write, what the address offset of the access is and a handle to the reqister or memory the access was made to.

Warning when setting uvm_reg values through a task. 0. How to use uvm_test_done objection in test sequence? 1. UVM Register Model: volatile register value change. 0. Register Abstraction Layer Difference Access Type. 1. Reference to UVM Sequence. 2. UVM End of test Objection Mechanism and Phase Ready to End Implementation.

Using the register model: The register model has a set of variables for desired and mirror register values. The document uses the terms desired and mirror, but I call them as Main and Mirror below to avoid confusion. The intent of the mirror variable is to hold or represent the RTL's value all the time so that it can be used as Scoreboard.

It may take some time, because peek is a SystemVerilog task, not a function. Function will be executed in 0 Simulation Time, but Tasks can have the timing delays as well. Here is it's definition. virtual task peek ( output uvm_status_e status, output uvm_reg_data_t value, input string kind = "", input uvm_sequence_base parent = null, input uvm.

In uvm_reg every field object (uvm_reg_field) maintains two values for the field, a "mirrored" value, and a "desired" value.. Which are update black box by the DUT so when read, supposedly you would have UVM_CHECK enabled, the check will most likely fail as your model is not updated properly. 2. Explicit prediction

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