The Communication and Customization Mechanisms in OVM and UVM
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1 DAC 2010 OVM World Booth The Communication and Customization Mechanisms in OVM and UVM John Aynsley, CTO, Doulos
2 The Communication and Customization Mechanisms in OVM and UVM CONTENTS Introducing Doulos
3
4 Professional Training Classes OVM and UVM Adopter Class SystemVerilog Training Customized for OVM / UVM Public open-enrolment or private on-site classes 4
5 The Communication and Customization Mechanisms in OVM and UVM CONTENTS Introducing Doulos Let's get Technical Communication Mechanisms
6 Communication in OVM Based on the SystemC TLM-1 standard put get peek 6
7 TLM-1 = Message Passing Request Response Each message is unidirectional 7
8 TLM-1 Semantics Initiator Target Push interface put(transaction) Δ Does not overwrite previous object Pull interface get() transaction Δ Removes object Pull interface peek() transaction Δ Does not touch object 8
9 Communication in OVM Blocking Non-blocking put try_put can_put get try_get can_get peek try_peek can_peek 9
10 Blocking vs Non-blocking put A blocking method may suspend only returns when it has succeeded try_put A non-blocking method must return immediately returns a status flag (success/failure) may require multiple tries 10
11 Required / Provided Interfaces Producer Port Export Consumer put_port.put(tx); task put(t tx); Push interface 11
12 Required / Provided Interfaces Producer Port Export Consumer ovm_blocking_put_port #(T) put_port; put_port.put(tx); Required ovm_blocking_put_export #(T) put_export; Provided task put(t tx); Contract prod.put_port.connect( cons.put_export ); Push interface 12
13 Sequencer-Driver Communication ovm_driver Port get(req) Export put(rsp) ovm_sequencer class my_driver extends ovm_driver #(REQ, RSP); // ovm_seq_item_pull_port #(REQ, RSP) seq_item_port; class my_sequencer extends ovm_sequencer #(REQ, RSP); // ovm_seq_item_pull_imp #(REQ, RSP, this_type) seq_item_export; Pull interface, two unidirectional messages 13
14 Sequencer-Driver Communication ovm_driver Port Export get(req) put(rsp) ovm_sequencer class my_agent extends ovm_agent; my_sequencer sequencer_h; my_driver driver_h; virtual function void connect; driver_h.seq_item_port.connect( sequencer_h.seq_item_export ); endfunction: connect Pull interface, two unidirectional messages 14
15 Sequencer-Driver Communication class my_driver extends ovm_driver #(REQ, RSP); virtual task run; REQ req; RSP rsp = new; forever begin seq_item_port.get( req ); // from sequencer // Wiggle pins rsp.set_id_info(req); seq_item_port.put( rsp ); // to sequencer end endtask: run Pull interface, two unidirectional messages 15
16 Direct vs Mediated Communication Producer Producer Producer port.put(tx); Port port.put(tx); Port chan.put(tx); tlm_fifo vmm_channel void put(t tx); Consumer Export Port port.get(tx) Consumer chan.get(tx); Consumer 16
17 Analysis Ports Monitor port.write(tx); Regular ports 1:1 Analysis Port void write(t tx) Subscriber Analysis Export Write is non-blocking 17
18 Analysis Ports Monitor port.write(tx); Regular ports 1:1 Analysis ports 1:many-or-none Analysis Port void write(t tx) Subscriber void write(t tx) Subscriber Analysis Export void write(t tx) Subscriber Write is non-blocking, subscribers are passive 18
19 The Communication and Customization Mechanisms in OVM and UVM CONTENTS Introducing Doulos Let's get Technical Communication Mechanisms Customization Mechanisms
20 Customization - The Factory function void build; super.build(); my_seq_h = my_seq ::type_id::create("my_seq_h", this); my_driv_h = my_driv ::type_id::create("my_driv_h", this); my_mon_h = my_mon::type_id::create("my_mon_h", this); endfunction: build Agent Sequencer class my_test extends uvm_test; Monitor function void build; super.build(); my_driv::type_id::set_type_override( alt_driver::get_type() ); my_env_h = my_env::type_id::create("my_env_h", this); endfunction: build Replace components, transactions, or sequences Driver 20
21 Customization - Callbacks class my_driver extends uvm_driver #(my_transaction); task run; forever begin my_transaction tx; seq_item_port.get(tx); call_modify(tx); // Wiggle pins of DUT end endtask: run `uvm_register_cb(my_driver, my_cb_interface) Agent Monitor Sequencer Driver task call_modify( my_transaction tx ); `uvm_do_callbacks( my_driver, my_cb_interface, modify( this, tx ) ) endtask Design callbacks into each component 21
22 Customization - Callbacks class my_cb extends my_cb_interface; virtual task modify( my_driver driver, my_transaction tx ); modify transaction here endtask endclass class my_test extends uvm_test; my_cb my_cb_h; function void start_of_simulation; my_driver driver_h; $cast(driver_h, uvm_top.find("*.my_driver_h")); my_cb_h = new("my_cb_h"); my_driver_cb_t::add(driver_h, my_cb_h); Register a specific callback with the driver 22
23 Summary Producer port.put(tx); Port Export void put(t tx); Consumer Callback Analysis port Callback Analysis port { Tests add callbacks } { Passive subscribers } { Tests replace objects set_type_override set_inst_override } { Tests add callbacks } { Passive subscribers } 23
24 The Communication and Customization Mechanisms in OVM and UVM CONTENTS Introducing Doulos Let's get Technical Communication Mechanisms Customization Mechanisms OVM and UVM Offers from Doulos
25 Professional Training Classes OVM and UVM Adopter Class SystemVerilog Training Customized for OVM / UVM Public open-enrolment or private on-site classes 25
26 OVM Golden Reference Guide Comprehensive reference guide to OVM Focuses on the most important issues Practical hints-and-tips 210 pages 26
27 Free OVM / UVM Resources Visit 27
28
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