UVM testbench hierarchyīelow is the typical UVM testbench hierarchy diagram. If responses are being returned from the driver to one of several sequences, the sequence id field in the sequenceitem is.UVM testbenches are constructed by extending uvm classes. Multiple sequences can interact concurrently with a driver The sequencer has an arbitration mechanism to ensure that.Ī sequence can be started with a priority, this enables some of the arbitration. The sequence architecture of a driver, sequencer, sequenceitem and sequence is orientated around a single interface. Once a sequence has started execution it should be allowed to complete, if it is stopped prematurely, then there is a. The handling of sequence items inside a sequence often relies to some extent on the how the driver processes sequence. In order to handle the sequence items arriving from the sequence the driver has access to methods which are. Once a chain of sequences is started, the flow of execution can be hierarchical, or. Inside the sequence body method, other sequences can be executed or. Sequence execution is started by calling the uvm sequence start() method, this associates the sequence with a sequencer. The sequencer end of the communication interface is connected to the driver end together.Īs sequenceitems are the foundation on which sequences are built, some care needs to be taken with their.īy convention sequenceitems should also contain a number of standard method. The sequencer is an intermediate component which implements communication. The driver is responsible for converting the information contained within. In the uvm sequence architecture, sequences are responsible for the stimulus generation flow and send sequenceitems. In terms of class inheritance, the uvmsequence inherits from the uvmsequenceitem which inherits from the. When a response is generated by the dut, then a sequenceitem is used by the driver. When a sequence is used, it is created, then the body method is. Sequences bring an Object Orientated approach to stimulus generation that is very.Ī sequence is an example of what software engineers call afunctor, in other words it is an object that is used as a. There are several disadvantages with this approach it is hard to support constrained. Learn all about sequences used to encapsulate stimulus, SequencerDriver hookup, pipelined protocols.
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