VerilatorとSystemCでSoftware Driven Verification
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VerilatorとSystemCの雑談会の資料です。
![module top // Memory だけど、Verilatorの慣習で top にしています
(
input logic clk,
input logic reset,
input logic [15:0] addr,
input logic cs,
input logic rw,
input logic [31:0] data_in,
output logic ready,
output logic [31:0] data_out
);
localparam ram_size = (17'h10000>>2);
logic [31:0] ram[ram_size];
enum {STATE_IDLE, STATE_RUN, STATE_DONE} state;
always_ff @(posedge clk) begin
if(reset == 1'b1)
state <= STATE_IDLE;
else if(cs == 1'b1 && state == STATE_IDLE)
state <= STATE_RUN;
else if(cs == 1'b1 && state == STATE_RUN)
state <= STATE_DONE;
else if(cs == 1'b0)
state <= STATE_IDLE;
end
DUT (Memory)
always_ff @(posedge clk) begin
if(reset == 1'b1) begin
data_out <= 32'h0000_0000;
ready <= 1'b0;
end
else if(state == STATE_RUN) begin
if(rw == 1'b1)
data_out <= ram[addr[15:2]];
else
ram[addr[15:2]] <= data_in;
ready <= 1'b1;
end
else begin
data_out <= 32'h0000_0000;
ready <= 1'b0;
end
end
endmodule](https://image.slidesharecdn.com/verilatorsystemcssoftwardrivenverification-220503060245/85/Verilator-SystemC-Software-Driven-Verification-13-320.jpg)
![int sc_main(int argc, char* argv[]) {
if (false && argc && argv) {}
Verilated::debug(0);
Verilated::randReset(2);
Verilated::commandArgs(argc, argv);
ios::sync_with_stdio();
sc_clock clk{"clk", 10, SC_NS, 0.5, 5, SC_NS, true};
sc_signal<bool> reset;
sc_signal<bool> cs;
sc_signal<bool> rw;
sc_signal<uint32_t> addr;
sc_signal<uint32_t> data_in;
sc_signal<bool> ready;
sc_signal<uint32_t> data_out;
const std::unique_ptr<Vtop> top{new Vtop{"top"}};
top->clk(clk);
top->reset(reset);
top->cs(cs);
top->rw(rw);
Top Testbench (sc_main)
top->addr(addr);
top->data_in(data_in);
top->ready(ready);
top->data_out(data_out);
const std::unique_ptr<bfm> u_bfm{new bfm("bfm")};
u_bfm->clk(clk);
u_bfm->reset(reset);
u_bfm->cs(cs);
u_bfm->rw(rw);
u_bfm->addr(addr);
u_bfm->data_in(data_out);
u_bfm->ready(ready);
u_bfm->data_out(data_in);
sc_start();
top->final();
cout << "done, time = " << sc_time_stamp() << endl;
return 0;
}](https://image.slidesharecdn.com/verilatorsystemcssoftwardrivenverification-220503060245/85/Verilator-SystemC-Software-Driven-Verification-14-320.jpg)
VerilatorとSystemCでSoftware Driven Verification
- 2. ブログ (2007年～) : Vengineerの戯言 http://blogs.yahoo.co.jp/verification_engineer SlideShare : https://www.slideshare.net/ssuser479fa3 Twitter (2009年～) : ＠Vengineer Software Driven Verifaction
- 3. ● Software Driven Verification ○ UVM (Universal Verification Methodology) : SystemVerilog ● Verilator とは？ ● SystemC とは？ ● 現在の SystemC は？ ● Verilator での Software Driven Verification ○ Verilator + SystemC ○ Verilator + SystemC + SystemVerilog DPI ● おわりに ● VerilatorでSystemCを使うには？ 発表内容
- 4. Software Driven Verification ● ソフトウェア(プログラム)を使って、ハードウェア(RTL等)を検証する DUT (Design under Test) RTL等で記述 Model Driver/Checker/Monitor Test Program Top Test Bench
- 5. SystemVerilogでは？ ● UVM (Universal Verification Methodology) : UVM 2020-1.1 DUT (Design under Test) SystemVerilog Model SystemVerilog Test Program SystemVerilog Top Test Bench (SystemVerilog) 現状、商用HDLシミュレータのみ利用可能
- 6. Verilator とは？ (https://github.com/verilator) Welcome to Verilator, the fastest Verilog/SystemVerilog simulator. ● Accepts synthesizable Verilog or SystemVerilog ● Performs lint code-quality checks ● Compiles into multithreaded C++, or SystemC ● Creates XML to front-end your own tools テストベンチ側に、 ● マルチスレッドな C++ ● SystemC が使える
- 7. SystemC とは？ 1999年にOpen SystemC(OSCI)が創設され、1999年9月にv0.9が公開 - 米Synopsys, Inc. - 米CoWare, Inc. - ベルギーFrontier Design社 ● 2005.6 v2.1 LRM & TLM 1.0 ● 2005.12 IEEE 1666-2005 (v2.1ベース) ● 2008.6 TLM 2.0 (2008.6) ● 2009.7 TLM 2.0 LRM (2009.7) ● 2010.2 AMS Extensions (2010.2)
- 8. 現在の SystemC は？ accellera で管理 ● 2018.11 SystemC 2.3.3 (Includes TLM) ● 2020.4 SystemC AMS 2.3 IEEE Standards Association (IEEE-SA) ● IEEE Std. 1666-2011 SystemC (SystemC 2.2 + TLM 2.0.1) ● IEEE Std. 1666.1-2016 SystemC AMS (SystemC AMS 2.0) github : https://github.com/accellera-official/systemc ● 2.3.3
- 9. Verilatorでは？ ● DUTは、SystemVerilog の RTL記述のみ使える DUT (Design under Test) SystemVerilog RTL Model C++/SystemC Test Program C++/SystemC Top Test Bench (C++/SystemC)
- 10. Verilator + SystemC ● DUTは、SystemVerilog の RTL記述のみ使える DUT (Design under Test) SystemVerilog RTL Model SystemC Test Program C++ Top Test Bench (SystemC)
- 11. Top Test Bench (SystemC) BFMとMemoryの接続は、ピン・レベル ● クロックは、sc_clock で生成
- 12. Verilator + SystemC ● DUT(Memory)にアクセスするケース DUT (Memory) SystemVerilog RTL Bus Functional Model SystemC Test Program SystemC Top Test Bench (SystemC) ● Read ● Write
- 13. module top // Memory だけど、Verilatorの慣習で top にしています ( input logic clk, input logic reset, input logic [15:0] addr, input logic cs, input logic rw, input logic [31:0] data_in, output logic ready, output logic [31:0] data_out ); localparam ram_size = (17'h10000>>2); logic [31:0] ram[ram_size]; enum {STATE_IDLE, STATE_RUN, STATE_DONE} state; always_ff @(posedge clk) begin if(reset == 1'b1) state <= STATE_IDLE; else if(cs == 1'b1 && state == STATE_IDLE) state <= STATE_RUN; else if(cs == 1'b1 && state == STATE_RUN) state <= STATE_DONE; else if(cs == 1'b0) state <= STATE_IDLE; end DUT (Memory) always_ff @(posedge clk) begin if(reset == 1'b1) begin data_out <= 32'h0000_0000; ready <= 1'b0; end else if(state == STATE_RUN) begin if(rw == 1'b1) data_out <= ram[addr[15:2]]; else ram[addr[15:2]] <= data_in; ready <= 1'b1; end else begin data_out <= 32'h0000_0000; ready <= 1'b0; end end endmodule
- 14. int sc_main(int argc, char* argv[]) { if (false && argc && argv) {} Verilated::debug(0); Verilated::randReset(2); Verilated::commandArgs(argc, argv); ios::sync_with_stdio(); sc_clock clk{"clk", 10, SC_NS, 0.5, 5, SC_NS, true}; sc_signal<bool> reset; sc_signal<bool> cs; sc_signal<bool> rw; sc_signal<uint32_t> addr; sc_signal<uint32_t> data_in; sc_signal<bool> ready; sc_signal<uint32_t> data_out; const std::unique_ptr<Vtop> top{new Vtop{"top"}}; top->clk(clk); top->reset(reset); top->cs(cs); top->rw(rw); Top Testbench (sc_main) top->addr(addr); top->data_in(data_in); top->ready(ready); top->data_out(data_out); const std::unique_ptr<bfm> u_bfm{new bfm("bfm")}; u_bfm->clk(clk); u_bfm->reset(reset); u_bfm->cs(cs); u_bfm->rw(rw); u_bfm->addr(addr); u_bfm->data_in(data_out); u_bfm->ready(ready); u_bfm->data_out(data_in); sc_start(); top->final(); cout << "done, time = " << sc_time_stamp() << endl; return 0; }
- 15. SC_MODULE(bfm) { public: SC_CTOR(bfm) : clk("clk"), reset("reset"), addr("addr"), cs("cs"), rw("rw"), data_in("data_in"), ready("ready"), data_out("data_out"), reset_done(false) { SC_THREAD(reset_task); sensitive << clk.pos(); SC_THREAD(main); sensitive << clk.pos(); } BFM (bfm) sc_in<bool> clk; sc_out<bool> reset; sc_out<uint32_t> addr; sc_out<bool> cs; sc_out<bool> rw; sc_out<uint32_t> data_out; sc_in<bool> ready; sc_in<uint32_t> data_in; private: bool reset_done;
- 16. BFM (bfm) void reset_task(){ reset.write(true); for(int i=0;i<4;i++) wait(); reset.write(false); wait(); cout << "done reset" << endl; reset_done = true; }
- 17. void main(){ cs.write(false); rw.write(true); addr.write(0x00); data_out.write(0x00); while(!reset_done) wait(); test_main(); sc_stop(); cout << "sc_stop(), time = " << sc_time_stamp() << endl; } BFM (bfm) void test_main(){ cout << "start test_main" << endl; write(0x200, 0x12345678); uint32_t data = read(0x200); if(data != 0x12345678) cout << "<<ERR>>, compare error, data = 0x" << hex << data << endl; cout << "finish test_main" << endl; }
- 18. BFM (bfm) uint32_t read(uint32_t addr_){ cs.write(true); rw.write(true); addr.write(addr_); while(!ready.read()){ wait(); } cs.write(false); addr.write(0x0); uint32_t data = data_in.read(); wait(); return data; } void write(uint32_t addr_, uint32_t data_){ cs.write(true); rw.write(false); addr.write(addr_); data_out.write(data_); while(!ready.read()){ wait(); } cs.write(false); addr.write(0x0); data_out.write(0x0); wait(); }
- 19. Verilator + SystemC ● Test Program を別ファイルにして、いろいろなテストができる DUT (Memory) SystemVerilog RTL Bus Functional Model SystemC Test Program SystemC Top Test Bench (SystemC) ● Read ● Write Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC
- 20. void main(){ cs.write(false); rw.write(true); addr.write(0x00); data_out.write(0x00); while(!reset_done) wait(); test_main(); sc_stop(); cout << "sc_stop(), time = " << sc_time_stamp() << endl; } BFM (bfm) + Test Program (test1.cpp) void test_main(){ cout << "start test_main" << endl; write(0x200, 0x12345678); uint32_t data = read(0x200); if(data != 0x12345678) cout << "<<ERR>>, compare error, data = 0x" << hex << data << endl; cout << "finish test_main" << endl; }
- 21. Verilator + SystemC + SystemVerilog DPI ● SystemVerilogのDPIを使うと、DUTの中に直接アクセスできる DUT (Memory) SystemVerilog RTL Bus Functional Model SystemC Test Program SystemC Top Test Bench (SystemC) ● Read ● Write Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC Test Program SystemC SystemVerilog DPI
- 22. Verilatorの薄い本 BOOTH : https://vengineer.booth.pm/ にて、 ソースコード解析職人の薄い本として、 ● Verilatorの中を調べる、No.1 : 例題解析編 ● Verilatorの中を調べる、No.2 : テストデータ解析編 ● Verilatorの中を調べる、No.3 : SystemC編 をダウンロード販売しています。
- 23. ● Software Driven Verification ○ UVM (Universal Verification Methodology) : SystemVerilog ● Verilator とは？ ● SystemC とは？ ● 現在の SystemC は？ ● Verilator での Software Driven Verification ○ Verilator + SystemC ○ Verilator + SystemC + SystemVerilog DPI ● おわりに ● VerilatorでSystemCを使うには？ 発表内容
- 24. VerilatorでSystemCを使うには？ 先に、SystemC 2.3.3 をどこか (/usr/local/systemc/2.3.3) にインストール 後、SYSTEMC_INCLUDE環境変数に、/usr/local/systemc/2.3.3/include を 設定して、verilator をビルド $ git clone -b v4.202 https://github.com/verilator/verilator.git v4.202 にて、SystemC で FST (Fast Signal Trace) をサポート $ cd verilator $ export SYSTEMC_INCLUDE=/usr/local/systemc/2.3.3/include $ autoconf $ ./configure --prefix=/usr/local/verilator/v4.202 $ make -j $ make install