UVM: TLM机制

topic

overview

不建议的方法：假如没有TLM

TLM

TLM 1.0

整个TLM机制下，底层逻辑离不开动作发起者和被动接受者这个底层的模型基础，但实际上，在验证环境中，任何一个组件，都有可能成为动作的发起者，都有可能主动发起命令，且只有掌握主动权，才能更灵活的控制数据的流通，因此TLM机制下，实际用的最多的组件，也就是基于FIFO的数据通信。

端对端的fifo模式

主要的连接图如上：

monitor里面声明put port端口。
reference model 里面声明get port端口。
monitor在agent里面，将agent的export端口与monitor的put port端口连接。
在env里，将agent 的export与fifo相连接，将reference model的port与fifo相连接。

class my_monitor extends uvm_component;`uvm_component_utils(my_monitor)uvm_blocking_put_port #(my_transaction, my_monitor) m2r_port;//monitor里面声明put port端口function new(string name = "",uvm_component parent);super.name(name, parent)this.m2r_port = new("m2r_port",this);endfunctiontask run_phase(uvm_phase phase);super.run_phase(phase);repeat(10) beginreq = seq_item::type_id::create("req");assert(req.randomize());m2r_port.put(req);`uvm_info(get_name(), $sformatf("Send value = %0h", req.value), UVM_NONE);#5;endendtask
endclassclass my_reference_model extends uvm_component;`uvm_component_utils(my_reference_model)uvm_blocking_get_port #(my_transaction) m2r_port;//reference model 里面声明get port端口function new(string name = "",uvm_component parent);super.name(name, parent)this.m2r_port = new("m2r_port",this);endfunctionvirtual task run_phase (my_transaction tr);`uvm_info(get_name(), "begin to get data from monitor",UVM_LOW)forever beginm2r_port.get(item);`uvm_info(get_name(),("master agent have been sent a transaction:\n",item.sprint()),UVM_LOW)endendtask
endclassclass master_agent extends uvm_agent;//monitor在agent里面，将agent的export端口与monitor的put port端口连接`uvm_component_utils(master_agent)uvm_blocking_put_export #(my_transaction) m_a2r_export;my_monitor my_mon;function new(string name = "",uvm_component parent);super.name(name, parent)this.m_a2r_export = new("m_a2r_export",this);endfunctionvirtual function void build_phase(uvm_phase phase);super.build_phase(phase);my_mon =  my_monitor::type_id::create("my_monitor", this);endfunction: build_phasevirtual function void connect_phase (uvm_phase phase);if(is_active = UVM_ACTIVE);my_mon.m2r_port.connect(this.m_a2r_export);`uvm_info(get_name(), "Monitor has been connect with agent",UVM_LOW)endfunction
endclassclass my_env extends uvm_env;//在env里，将agent 的export与fifo相连接，将reference model的port与fifo相连接`uvm_component_utils(my_env)my_reference_model my_model;master_agent my_agent;uvm_tlm_analysis_fifo # (my_transaction) agt2ref_mod_fifo function new(string name = "",uvm_component parent);super.name(name, parent)this.agt2ref_mod_fifo = new("agt2ref_mod_fifo",this);endfunctionvirtual function void build_phase(uvm_phase phase);super.build_phase(phase);my_model =  my_reference_model::type_id::create("my_model", this);my_agent =  master_agent::type_id::create("my_agent", this);endfunction: build_phasevirtual function void connect_phase (uvm_phase phase);my_agent.m_a2r_export.connect(agt2ref_mod_fifo.uvm_blocking_put_export)；my_model.m2r_port.connect(agt2ref_mod_fifo.uvm_blocking_get_export);endfunction
endclass

参考文献

原文链接：https://blog.csdn.net/JamesBond619/article/details/137541659
原文链接：https://blog.csdn.net/qq_36955425/article/details/130631383