还有在uvm reg的class内部引入covergroup的代码破坏可读性和可维护性,env中引入的额外的uvm reg的coverage api也导致环境和uvmreg之间产生依赖性。 作者的解法 作者的解法倒是很直观,外部定义一个专门的class reg_cov_subscriber负责coverage收集,内部组合一个uvm_reg_model的handle,既不影响原先的uvm reg验证流程,又能...
Figure 1: Example Functional Coverage Syntax Each covergroup contains options for configuration which allows customization. The example shown in Figure 1 uses options which determine the number of bins that are created for the pwdata signal and whether the covergroup is static across all instances or ...
Clean Up Phases clean up phases 用于从scoreboard和functional coverage monitor中提取信息,以确定测试用例是否已经通过并且达到了预期覆盖目标。clean up phases 是作为函数实现的,所以执行时间为零。它们自底向上执行。 查看UVM源码可以发现,final phase是派生自uvm_topdown_phase的(同build phase),应该是自上向下执行...
而是否构建其他子组件则应该由附加的配置属性来控制,这些属性应该具有描述性名称。例如,如果有一个 functional coverage collector,那么应该有一些控制位来控制是否构建它,比如适当地将其命名为has_functional_coverage。 config object包含driver和monitor使用的BFM虚接口句柄。config object是在test中构造和配置的,在这个顶...
agent本身是一个包含sequencer、driver和monitor的容器,也包含其他相关的验证组件,比如functional coverage collector 以及scoreboard(一般不会放置在agent内)。代理只是提供与“普通”类的对象相同API的类的对象。driver代理和monitor代理以寻常的方式与UVM testbench的其余部分通信,同时还通过虚接口句柄分别访问driver和monitor...
value:Mirrored field value. This value can be sampled in a functional coverage model or constrained when randomized. get_mirrored_value:Return the mirrored value of the field. It does not actually read the value of the field in the design, only the mirrored value in the abstraction class. If...
clean up phases 用于从scoreboard和functional coverage monitor中提取信息,以确定测试用例是否已经通过并且达到了预期覆盖目标。clean up phases 是作为函数实现的,所以执行时间为零。它们自底向上执行。 查看UVM源码可以发现,final phase是派生自uvm_topdown_phase的(同build phase),应该是自上向下执行的。我觉得是因为...
Mirrored field value. This value can be sampled in a functional coverage model or constrained when randomized. Initialization new function new(stringname="uvm_reg_field") Create a new field instance This method should not be used directly. The uvm_reg_field::type_id::create() factory method ...
Multiple functional coverage models may be specified by adding their symbolic names, as defined by the uvm_coverage_model_e type.configure function void configure ( uvm_reg_block blk_parent, uvm_reg_file regfile_parent = null, string hdl_path = "" ) Instance-specific configuration Specify ...
4)Systemverilog Assertions and Functional Coverage 前半部分将assertion,后半部分讲coverage。我对assertion一直没什么感觉,但是后面的coverage的思考帮助真的很大,什么样的cover是真正有意义的。看这本书的前提是systemverilog的基础一定要非常扎实,而其要有比较多的实践经验。这两者缺一不可,要不然怎么和作者产生共鸣呢...