Course Basic Uvm Session5 Introducing Transactions Tfitzpatrick
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UVM Basics Introducing Transactions
Tom Fitzpatrick
Verification Evangelist
Env
Sequencer and Driver
Agent
Sequencer
Driver Monitor
DUT Pin wiggles
Transactions
© 2013 Mentor Graphics Corporation, all rights reserved.
UVM Class Hierarchy
uvm_env uvm_agent uvm_driver uvm_monitor
uvm_scoreboard uvm_test uvm_sequencer
Structure uvm_component
uvm_sequence_item
uvm_sequence
Data
uvm_transaction
uvm_object
uvm_report_object
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Transaction class my_transaction extends uvm_sequence_item;
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Transaction class my_transaction extends uvm_sequence_item; `uvm_object_utils(my_transaction)
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Transaction class my_transaction extends uvm_sequence_item; `uvm_object_utils(my_transaction) rand bit cmd; rand int addr; rand int data; constraint c_addr { addr >= 0; addr < 256; } constraint c_data { data >= 0; data < 256; }
© 2013 Mentor Graphics Corporation, all rights reserved.
Transaction class my_transaction extends uvm_sequence_item; `uvm_object_utils(my_transaction) rand bit cmd; rand int addr; rand int data; constraint c_addr { addr >= 0; addr < 256; } constraint c_data { data >= 0; data < 256; } function new (string name = ""); super.new(name); endfunction: new endclass: my_transaction
© 2013 Mentor Graphics Corporation, all rights reserved.
Env
Sequencer and Driver
Agent
Sequencer
Driver Monitor
DUT
© 2013 Mentor Graphics Corporation, all rights reserved.
Vanilla Sequencer – use typedef typedef uvm_sequencer #(my_transaction) my_sequencer; /* class my_sequencer extends uvm_sequencer #(my_transaction); `uvm_component_utils(my_sequencer) function new(string name, uvm_component parent); super.new(name, parent); endfunction: new endclass: my_sequencer */
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uvm_sequence class my_sequence extends uvm_sequence #(my_transaction);
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uvm_sequence class my_sequence extends uvm_sequence #(my_transaction); `uvm_object_utils(my_sequence)
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uvm_sequence class my_sequence extends uvm_sequence #(my_transaction); `uvm_object_utils(my_sequence) function new (string name = ""); super.new(name); endfunction: new
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uvm_sequence class my_sequence extends uvm_sequence #(my_transaction); `uvm_object_utils(my_sequence) function new (string name = ""); super.new(name); endfunction: new task body; ... The behavior of the sequence
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uvm_sequence
task body; forever begin end endtask: body
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uvm_sequence
task body; forever begin my_transaction tx; tx = my_transaction::type_id::create("tx"); end endtask: body
"Factory method" can be overridden in tests
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uvm_sequence
task body; forever begin my_transaction tx; tx = my_transaction::type_id::create("tx"); start_item(tx); assert( tx.randomize() ); finish_item(tx); end endtask: body
© 2013 Mentor Graphics Corporation, all rights reserved.
Env
Sequencer and Driver
Agent
Sequencer
Driver Monitor
DUT
© 2013 Mentor Graphics Corporation, all rights reserved.
Driver class my_driver extends uvm_driver #(my_transaction);
© 2013 Mentor Graphics Corporation, all rights reserved.
Driver class my_driver extends uvm_driver #(my_transaction); `uvm_component_utils(my_driver) virtual dut_if dut_vi; function new(string name, uvm_component parent); super.new(name, parent); endfunction: new function void build_phase(uvm_phase phase); ... task run_phase(uvm_phase phase); ...
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Driver task run_phase(uvm_phase phase); forever begin my_transaction tx; @(posedge dut_vi.clock); end endtask: run_phase
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Driver task run_phase(uvm_phase phase); forever begin my_transaction tx; @(posedge dut_vi.clock); seq_item_port.get_next_item(tx); end endtask: run_phase
© 2013 Mentor Graphics Corporation, all rights reserved.
Driver task run_phase(uvm_phase phase); forever begin my_transaction tx; @(posedge dut_vi.clock); seq_item_port.get_next_item(tx); dut_vi.cmd = tx.cmd; dut_vi.addr = tx.addr; dut_vi.data = tx.data; end endtask: run_phase
Pin wiggles
© 2013 Mentor Graphics Corporation, all rights reserved.
Driver task run_phase(uvm_phase phase); forever begin my_transaction tx; @(posedge dut_vi.clock); seq_item_port.get_next_item(tx); dut_vi.cmd = tx.cmd; dut_vi.addr = tx.addr; dut_vi.data = tx.data; @(posedge dut_vi.clock) seq_item_port.item_done(); end endtask: run_phase
Transaction complete
© 2013 Mentor Graphics Corporation, all rights reserved.
Driver task run_phase(uvm_phase phase); forever begin my_transaction tx; @(posedge dut_vi.clock); seq_item_port.get_next_item(tx); dut_vi.cmd = tx.cmd; dut_vi.addr = tx.addr; dut_vi.data = tx.data; @(posedge dut_vi.clock) seq_item_port.item_done(); end endtask: run_phase
© 2013 Mentor Graphics Corporation, all rights reserved.
Env
Summary
Agent
Sequencer
Driver Monitor
DUT
Transactions
Pin wiggles
© 2013 Mentor Graphics Corporation, all rights reserved.
info@verificationacademy.com | www.verificationacademy.com
UVM Basics Introducing Transactions
Tom Fitzpatrick
Verification Evangelist
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