Slicing Through the UVM's Red Tape A Frustrated User's Survival Guide
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1 Slicing Through the UVM's Red Tape A Frustrated User's Survival Guide Jonathan Bromley Accellera Systems Initiative 1
2 UVM!= Straitjacket Doesn't cover everything Some key common requirements unsatisfied User must make intelligent choices Basic standard approaches not always optimal Accellera Systems Initiative 2
3 Example 1: Multi-Subscriber Scoreboard How to implement? AGENT Sqr AGENT Monitor AGENT Monitor Driver Monitor DUT Accellera Systems Initiative 3
4 Multi-Subscriber: BAD IDEAS How to implement? Scoreboard uvm_analysis_fifo AGENT AGENT AGENT poor fit with typical problems Sqr Driver Monitor DUT Monitor Monitor "collector" process is hard to design well uvm_analysis_imp_decl doesn't scale to N similar sources unbelievably nasty subscriber instances too much customization work Accellera Systems Initiative 4
5 Consider the Essentials Configurable (dynamic) array of analysis_export write(txn,index) for custom functionality As easy to use as uvm_subscriber class uvm_indexed_subscriber #(type T) extends uvm_component; int n_exports; uvm_analysis_export #(T) analysis_export[]; virtual function void write( T t, int index ); case (index)... Accellera Systems Initiative 5
6 Implement! Base class contains embedded subscriber class Base class constructs arrays class uvm_indexed_subscriber #(type T) extends uvm_component; subscriber[0] subscriber[1]... subscriber[n_exports-1] int index; indexed_subscriber#(t) parent; function void write(t t); parent.write(t, index); endfunction int n_exports; uvm_analysis_export #(T) analysis_export[]; idx_sub #(T) subscriber[]; virtual function void write( T t, int index ); Accellera Systems Initiative 6
7 2: Deploying Config Objects Sqr Driver AGENT Monitor No uncertainty about this structure Config DB? not the only way to get information into components Not even optimal, within a well-defined structure Use config DB to get stuff into the agent Agent then uses simple copy to distribute it to child components Accellera Systems Initiative 7
8 Config Deployment: BAD IDEAS (1) insist on an entry in config_db maybe it was provided by copy! function void build_phase( ); super.build_phase(phase); if (!uvm_config_db#(my_cfg_class)::get( )) begin `uvm_error("no_cfg", ); end Accellera Systems Initiative 8
9 Config Deployment: BAD IDEAS (2) push a value downwards in connect_phase it's bottom-up! build_phase child.cfg = this.cfg; top_comp 1 mid_comp 2 low_comp connect_phase child.cfg = this.cfg; 2 1 Accellera Systems Initiative 9
10 Config Deployment: BAD IDEAS (3) Excessively lax wildcard matching jeopardizes reusability uvm_config_db#(my_cfg_class)::set( this, "*", "cfg", cfg ); Targets any descendant component! Accellera Systems Initiative 10
11 Consider the Essentials Within a well-known structure, use methods or copy Allow for off-standard customization (use configdb) function void build_phase( ); super.build_phase(phase); if (uvm_config_db#(my_cfg_class)::get(, cfg)) begin `uvm_info("cfg_from_db", ) end if (cfg == null) begin `uvm_error("no_cfg, ) end Config-DB can override copy Flexible for any component Accellera Systems Initiative 11
12 3: Layered Data-intensive Sequences class serdes_symbol extends uvm_sequence_item; rand bit [9:0] symbol_bits; rand int n_bits; A B C rand bit timing_error; D E F constraint symbol_10_bits { A A A soft!timing_error; U V W if (timing_error) { n_bits inside {[1:10]}; } else { X Y Z n_bits == 10; frame_sequence } } randomize A B C D E V W X Y Z serdes_symbol data24_stream randomize enca encb ency encz Accellera Systems Initiative 12
13 3: Layered Data-intensive Sequences class serdes_symbol extends uvm_sequence_item; rand bit [9:0] symbol_bits; class rand frame_sequence int n_bits; extends uvm_sequence; rand rand bit bit [7:0] timing_error; fr_data[]; task constraint body(); symbol_10_bits { serdes_symbol soft!timing_error; sym; foreach if (timing_error) (fr_data[i]){ begin bit n_bits [9:0] inside val = {[1:10]}; encode(fr_data[i]); } `uvm_do_with( else { sym, n_bits {symbol_bits == 10; == local::val;} ) end } endtask } endclass A B C D E F A A A U V W X Y Z frame_sequence randomize A B C D E V W X Y Z serdes_symbol data24_stream randomize enca encb ency encz Accellera Systems Initiative 13
14 3: Layered Data-intensive Sequences class serdes_symbol extends uvm_sequence_item; rand bit [9:0] symbol_bits; class rand frame_sequence int n_bits; extends uvm_sequence; rand rand bit bit [7:0] timing_error; fr_data[]; class task constraint data24_sequence body(); symbol_10_bits extends { uvm_sequence; rand serdes_symbol soft bit [23:0]!timing_error; stream_data[]; sym; data24_stream A B C D E F A A A U V W X Y Z frame_sequence task foreach if body(); (timing_error) (fr_data[i]){ begin frame_sequence bit n_bits [9:0] inside val fr_seq; = {[1:10]}; encode(fr_data[i]); serdes_symbol `uvm_do_with( } else { fr_seq, sym, { frame_data.size() n_bits {symbol_bits == 10; == == local::val;} 3*stream_data.size(); ) end } foreach (stream_data[i]) { endtask } frame_data[3*i] == stream_data[i][23:16]; frame_data[3*i+1] == stream_data[i][15:8]; endclass frame_data[3*i+2] == stream_data[i][7:0];... randomize A B C D E V W X Y Z randomize enca encb ency encz Accellera Systems Initiative 14
15 Data Sequences: BAD IDEAS randomize everything inefficient, clumsy strictly deterministic code limits flexibility Accellera Systems Initiative 15
16 Consider the Essentials Allow for error injection Plan for flexibility Consider efficiency especially for small low-level sequences rand bit [7:0] fr_data[]; task body(); No flexibility lost serdes_symbol sym; foreach (fr_data[i]) begin `uvm_create( sym ) sym.symbol_bits = encode(fr_data[i]); `uvm_send( sym ) end endtask Accellera Systems Initiative 16
17 Takeaway UVM is a great kick-start not the end of the journey It's only code! Be prepared to try out new ideas but have a fallback; ideas sometimes don't work out Don't trust UVM has done all the work for you Share good ideas to limit wheel reinvention forum sites constructive review in-house toolkits / patterns Accellera Systems Initiative 17
18 Thank You! Any Questions? Accellera Systems Initiative 18
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