src/edu/berkeley/fleet/fpga/verilog/Verilog.java

   1 package edu.berkeley.fleet.fpga.verilog;
   2 import edu.berkeley.fleet.api.*;
   3 import edu.berkeley.fleet.two.*;
   4 import edu.berkeley.fleet.*;
   5 import java.lang.reflect.*;
   6 import edu.berkeley.sbp.chr.*;
   7 import edu.berkeley.sbp.misc.*;
   8 import edu.berkeley.sbp.meta.*;
   9 import edu.berkeley.sbp.util.*;
  10 import java.util.*;
  11 import java.io.*;
  12 import static edu.berkeley.fleet.two.FleetTwoFleet.*;
  13
  14 public class Verilog {
  15
  16     public static class SimpleValue implements Value {
  17         public final String s;
  18         public SimpleValue(String s) { this.s = s; }
  19         public SimpleValue(String s, int high, int low) { this.s = s+"["+high+":"+low+"]"; }
  20         public Value getBits(int high, int low) { return new SimpleValue(s, high, low); }
  21         public Assignable getAssignableBits(int high, int low) { return new SimpleValue(s, high, low); }
  22         public String getVerilogName() { return s; }
  23         public String toString() { return s; }
  24     }
  25
  26     public static class CatValue implements Value {
  27         private final Value[] values;
  28         public CatValue(Value[] values) { this.values = values; }
  29         public Value getBits(int high, int low) {
  30             throw new RuntimeException();
  31         }
  32         public Assignable getAssignableBits(int high, int low) {
  33             throw new RuntimeException();
  34         }
  35         public String toString() { return getVerilogName(); }
  36         public String getVerilogName() {
  37             StringBuffer sb = new StringBuffer();
  38             sb.append("{ ");
  39             boolean first = true;
  40             for(int i=0; i<values.length; i++) {
  41                 if (values[i]==null) continue;
  42                 if (!first) sb.append(", ");
  43                 sb.append(values[i].getVerilogName());
  44                 first = false;
  45             }
  46             sb.append(" }");
  47             return sb.toString();
  48         }
  49     }
  50
  51     public static interface Action {
  52         public String getVerilogAction();
  53     }
  54
  55     public static interface Trigger {
  56         public String getVerilogTrigger();
  57         public Trigger invert();
  58     }
  59
  60     public static class InvertedTrigger implements Trigger {
  61         private final Trigger original;
  62         public InvertedTrigger(Trigger original) { this.original = original; }
  63         public String getVerilogTrigger() { return "!("+original.getVerilogTrigger()+")"; }
  64         public Trigger invert() { return original; }
  65     }
  66
  67     public static interface Assignable {
  68         public String getVerilogName();
  69         public Assignable getAssignableBits(int high, int low);
  70     }
  71
  72     public static interface Value extends Assignable {
  73         public String getVerilogName();
  74         public Value getBits(int high, int low);
  75     }
  76
  77     public static class ConditionalAction implements Action {
  78         public String condition;
  79         public Action action;
  80         public ConditionalAction(String condition, Action action) {
  81             this.condition = condition;
  82             this.action = action;
  83         }
  84         public String toString() { return getVerilogAction(); }
  85         public String getVerilogAction() { return "if ("+condition+") begin "+action.getVerilogAction()+" end"; }
  86     }
  87
  88     public static class ConditionalTrigger implements Trigger {
  89         public String condition;
  90         public Trigger trigger;
  91         public ConditionalTrigger(String condition, Trigger trigger) {
  92             this.condition = condition;
  93             this.trigger = trigger;
  94             if (trigger instanceof Module.Port)
  95                 ((Module.Port)trigger).hasLatch = true;
  96         }
  97         public String getVerilogTrigger() {
  98             return "&& (("+condition+") ? (1 " + trigger.getVerilogTrigger() + ") : 1)";
  99         }
 100         public Trigger invert() { return new InvertedTrigger(this); }
 101     }
 102
 103     public static class SimpleAssignable implements Assignable {
 104         public final String s;
 105         public SimpleAssignable(String s) { this.s = s; }
 106         public String getVerilogName() { return s; }
 107         public Assignable getAssignableBits(int high, int low) { return new SimpleValue(s, high, low); }
 108     }
 109
 110     public static class AssignAction implements Action {
 111         public String left;
 112         public String right;
 113         public AssignAction(Assignable left, Value right) {
 114             this.left = left.getVerilogName();
 115             this.right = right.getVerilogName().toString();
 116         }
 117         public AssignAction(Assignable left, String right) {
 118             this.left = left.getVerilogName();
 119             this.right = right;
 120         }
 121         public String getVerilogAction() { return left + "<=" + right + ";"; }
 122         public String toString() { return getVerilogAction(); }
 123     }
 124
 125     public static class SimpleAction implements Action {
 126         public final String verilog;
 127         public SimpleAction(String verilog) { this.verilog = verilog; }
 128         public String getVerilogAction() { return verilog; }
 129         public String toString() { return verilog; }
 130     }
 131
 132     public static class Module {
 133         public void dump(String prefix) throws IOException {
 134             PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream(prefix+"/"+name+".v")));
 135             dump(pw, true);
 136             pw.flush();
 137             for(InstantiatedModule m : instantiatedModules)
 138                 m.module.dump(prefix);
 139         }
 140         public int id = 0;
 141         public final String name;
 142         public String getName() { return name; }
 143         public Port getPort(String name) { return ports.get(name); }
 144
 145         public HashSet<InstantiatedModule> instantiatedModules = new HashSet<InstantiatedModule>();
 146         public final ArrayList<Event> events = new ArrayList<Event>();
 147
 148         // FIXME: always-alphabetical convention?
 149         public final HashMap<String,Port> ports = new HashMap<String,Port>();
 150         public final ArrayList<String> portorder = new ArrayList<String>();
 151         public final HashMap<String,StateWire> statewires = new HashMap<String,StateWire>();
 152         public final HashMap<String,Latch> latches = new HashMap<String,Latch>();
 153
 154         public StringBuffer crap = new StringBuffer();
 155         public StringBuffer precrap = new StringBuffer();
 156         //public void addCrap(String s) { crap.append(s); crap.append('\n'); }
 157         public void addPreCrap(String s) { precrap.append(s); precrap.append('\n'); }
 158         public void addPreCrap0(String s) { precrap.append(s); }
 159
 160         public Module(String name) {
 161             this.name = name;
 162         }
 163
 164         public SourcePort createInputPort(String name, int width) {
 165             if (ports.get(name)!=null) throw new RuntimeException();
 166             return new SourcePort(name, width, true);
 167         }
 168         public SourcePort getInputPort(String name) {
 169             SourcePort ret = (SourcePort)ports.get(name);
 170             if (ret==null) throw new RuntimeException();
 171             return ret;
 172         }
 173         public SinkPort createOutputPort(String name, int width, String resetBehavior) {
 174             if (ports.get(name)!=null) throw new RuntimeException();
 175             return new SinkPort(name, width, true, resetBehavior);
 176         }
 177         public SinkPort createWirePort(String name, int width) {
 178             if (ports.get(name)!=null) throw new RuntimeException();
 179             return new SinkPort(name, width, false, "");
 180         }
 181         public SourcePort createWireSourcePort(String name, int width) {
 182             if (ports.get(name)!=null) throw new RuntimeException();
 183             return new SourcePort(name, width, false);
 184         }
 185         public SinkPort getOutputPort(String name) {
 186             SinkPort ret = (SinkPort)ports.get(name);
 187             if (ret==null) throw new RuntimeException();
 188             return ret;
 189         }
 190
 191         public class StateWire {
 192             public final String name;
 193             public final boolean initiallyFull;
 194             public String getName() { return name; }
 195             public Action isFull()  { return new SimpleAction(name+"==1"); }
 196             public Action isEmpty() { return new SimpleAction(name+"==0"); }
 197             public Action doFill()  { return new SimpleAction(name+"<=1;"); }
 198             public Action doDrain() { return new SimpleAction(name+"<=0;"); }
 199             public String doReset() { return name+"<="+(initiallyFull?"1":"0")+";"; }
 200             public StateWire(String name) { this(name, false); }
 201             public StateWire(String name, boolean initiallyFull) {
 202                 this.name = name;
 203                 this.initiallyFull = initiallyFull;
 204                 statewires.put(name, this);
 205             }
 206             public void dump(PrintWriter pw) {
 207                 pw.println("  reg "+name+";");
 208                 pw.println("  initial "+name+"="+(initiallyFull?"1":"0")+";");
 209             }
 210         }
 211
 212         public class Latch implements Assignable, Value {
 213             public final String name;
 214             public final int width;
 215             public final long initial;
 216             public Latch(String name, int width) { this(name, width, 0); }
 217             public Latch(String name, int width, long initial) {
 218                 this.width = width;
 219                 this.name = name;
 220                 this.initial = initial;
 221                 latches.put(name, this);
 222             }
 223             public String getVerilogName() { return name; }
 224             public Value getBits(int high, int low) { return new SimpleValue(getVerilogName(), high, low); }
 225             public Assignable getAssignableBits(int high, int low) { return new SimpleValue(getVerilogName(), high, low); }
 226             public String doReset() { return name+"<="+initial+";"; }
 227             public void dump(PrintWriter pw) {
 228                 pw.println("  reg ["+(width-1)+":0] "+name+";");
 229                 pw.println("  initial "+name+"="+initial+";");
 230             }
 231             public void connect(SinkPort driven) {
 232                 driven.latchDriver = this;
 233             }
 234         }
 235
 236         public abstract class Port implements Action, Assignable, Trigger {
 237             public abstract String doReset();
 238             public final String name;
 239             public String getName() { return name; }
 240             public final int width;
 241             public int getWidth() { return width; }
 242             public boolean hasLatch = false;
 243             public boolean external;
 244             public Port(String name, int width, boolean external) {
 245                 this.width = width;
 246                 this.name = name;
 247                 this.external = external;
 248                 ports.put(name, this);
 249                 if (external)
 250                     portorder.add(name);
 251             }
 252             public String getVerilogName() { return name; }
 253             String getAck() { return name+"_a"; }
 254             String getReq() { return name+"_r"; }
 255             public String isFull() { return "("+name+"_r"+" && !"+name+"_a)"; }
 256             public abstract String getInterface();
 257             public abstract String getSimpleInterface();
 258             public abstract String getDeclaration();
 259             public abstract String getAssignments();
 260             public abstract void   connect(SinkPort driven);
 261             public Trigger invert() { return new InvertedTrigger(this); }
 262         }
 263
 264         public static class InstantiatedModule {
 265             public final Module module;
 266             public final Module thisModule;
 267             public final int id;
 268             public final HashMap<String,Port> ports = new HashMap<String,Port>();
 269             public String getName() { return module.getName()+"_"+id; }
 270             public InstantiatedModule(Module thisModule, Module module) {
 271                 this.thisModule = thisModule;
 272                 this.module = module;
 273                 this.id = thisModule.id++;
 274                 thisModule.instantiatedModules.add(this);
 275             }
 276             public void dump(PrintWriter pw) {
 277                 pw.println("  " + module.getName() + " " + getName() + "(clk, rst ");
 278                 for(String s : module.portorder)
 279                     pw.println(", " + getPort(s).getSimpleInterface());
 280                 if (module.name.equals("dram")) {
 281                     pw.println("    , dram_addr");
 282                     pw.println("    , dram_addr_r");
 283                     pw.println("    , dram_addr_a");
 284                     pw.println("    , dram_isread");
 285                     pw.println("    , dram_write_data");
 286                     pw.println("    , dram_write_data_push");
 287                     pw.println("    , dram_write_data_full");
 288                     pw.println("    , dram_read_data");
 289                     pw.println("    , dram_read_data_pop");
 290                     pw.println("    , dram_read_data_empty");
 291                     pw.println("    , dram_read_data_latency");
 292                 }
 293                 if (module.name.equals("ddr2")) {
 294                     pw.println("    , ddr2_addr");
 295                     pw.println("    , ddr2_addr_r");
 296                     pw.println("    , ddr2_addr_a");
 297                     pw.println("    , ddr2_isread");
 298                     pw.println("    , ddr2_write_data");
 299                     pw.println("    , ddr2_write_data_push");
 300                     pw.println("    , ddr2_write_data_full");
 301                     pw.println("    , ddr2_read_data");
 302                     pw.println("    , ddr2_read_data_pop");
 303                     pw.println("    , ddr2_read_data_empty");
 304                     pw.println("    , ddr2_read_data_latency");
 305                 }
 306                 if (module.name.equals("video")) {
 307                     pw.println("    , vga_clk");
 308                     pw.println("    , vga_psave");
 309                     pw.println("    , vga_hsync");
 310                     pw.println("    , vga_vsync");
 311                     pw.println("    , vga_sync");
 312                     pw.println("    , vga_blank");
 313                     pw.println("    , vga_r");
 314                     pw.println("    , vga_g");
 315                     pw.println("    , vga_b");
 316                     pw.println("    , vga_clkout");
 317                 }
 318                 pw.println("   );");
 319             }
 320             public Port getPort(String name) {
 321                 return (module.ports.get(name) instanceof SinkPort) ? getOutputPort(name) : getInputPort(name);
 322             }
 323             public SinkPort getInputPort(String name) {
 324                 int width = module.getPort(name).getWidth();
 325                 SinkPort port = (SinkPort)ports.get(name);
 326                 if (port == null) {
 327                     port = thisModule.new SinkPort(getName()+"_"+name, width, false, "");
 328                     ports.put(name, port);
 329                 }
 330                 return port;
 331             }
 332             public SourcePort getOutputPort(String name) {
 333                 int width = module.getPort(name).getWidth();
 334                 SourcePort port = (SourcePort)ports.get(name);
 335                 if (port == null) {
 336                     port = thisModule.new SourcePort(getName()+"_"+name, width, false);
 337                     ports.put(name, port);
 338                 }
 339                 return port;
 340             }
 341         }
 342
 343         public class SourcePort extends Port implements Value {
 344             public SourcePort(String name, int width, boolean external) {
 345                 super(name, width, external); }
 346             public Value getBits(int high, int low) { return new SimpleValue(getVerilogName(), high, low); }
 347             public Assignable getAssignableBits(int high, int low) { return new SimpleValue(getVerilogName(), high, low); }
 348             public String getVerilogTrigger() { return " && " + getReq() + " && !"+getAck(); }
 349             public String getVerilogAction() { return getAck() + " <= 1;"; }
 350             public String getInterface() { return getReq()+", "+getAck()+"_, "+name+""; }
 351             public String getSimpleInterface() { return getReq()+", "+getAck()+", "+name+""; }
 352             public String testBit(int index, boolean value) {
 353                 return "("+name+"["+index+"]=="+(value?1:0)+")";
 354             }
 355             public String getDeclaration() {
 356                 StringBuffer sb = new StringBuffer();
 357                 if (external) {
 358                     sb.append("input "  +                 name +"_r;\n");
 359                     sb.append("output " +                 name +"_a_;\n");
 360                     if (width>0)
 361                         sb.append("input ["+(width-1)+":0]" + name +";\n");
 362                     else
 363                         sb.append("input [0:0]" + name +";\n"); // waste a bit, I guess
 364                 } else {
 365                     sb.append("wire "  +                 name +"_r;\n");
 366                     if (width>0)
 367                         sb.append("wire ["+(width-1)+":0]" + name +";\n");
 368                 }
 369                 if (!hasLatch) {
 370                     sb.append("wire "    +                 name +"_a;\n");
 371                 } else {
 372                     sb.append("reg "    +                 name +"_a;\n");
 373                     sb.append("initial " +                name +"_a = 0;\n");
 374                 }
 375                 return sb.toString();
 376             }
 377             public String doReset() { return hasLatch ? name+"_a<=1;" : ""; }
 378             public String getAssignments() {
 379                 StringBuffer sb = new StringBuffer();
 380                 if (external)
 381                     sb.append("assign " +                 name +"_a_ = " + name + "_a;\n");
 382                 return sb.toString();
 383             }
 384             public void connect(SinkPort driven) {
 385                 driven.driver = this;
 386             }
 387         }
 388         public class SinkPort extends Port {
 389             public SourcePort driver = null;
 390             public boolean forceNoLatch = false;
 391             public SinkPort driven = null;
 392             public Value latchDriver = null;
 393             public boolean noDriveLatches = false;
 394             public final String resetBehavior;
 395             public Assignable getAssignableBits(int high, int low) { return new SimpleValue(getVerilogName(), high, low); }
 396             public String getVerilogAction() { return getReq() + " <= 1;"; }
 397             public String getVerilogTrigger() { return " && !" + getReq() + " && !"+getAck(); }
 398             public SinkPort(String name, int width, boolean external, String resetBehavior) {
 399                 super(name, width, external); this.resetBehavior=resetBehavior; }
 400             public String getResetBehavior() { return resetBehavior; }
 401             public String getInterface() { return name+"_r_, "+name+"_a, "+name+"_"; }
 402             public String getSimpleInterface() { return name+"_r, "+name+"_a, "+name; }
 403             public String getDeclaration() {
 404                 StringBuffer sb = new StringBuffer();
 405                 if (external) {
 406                     sb.append("output "  +                 name +"_r_;\n");
 407                     sb.append("input "   +                 name +"_a;\n");
 408                     if (width>0)
 409                         sb.append("output ["+(width-1)+":0]" + name +"_;\n");
 410                     else
 411                         sb.append("output [0:0]" + name +"_;\n"); // waste a bit, I guess
 412                 } else {
 413                     sb.append("wire "   +                 name +"_a;\n");
 414                 }
 415
 416                 if (forceNoLatch ||  latchDriver!=null) {
 417                     sb.append("reg "    +                  name +"_r;\n");
 418                     sb.append("initial " +                 name +"_r = 0;\n");
 419                     if (width>0)
 420                         sb.append("wire   ["+(width-1)+":0]" + name +";\n");
 421                 } else if (!hasLatch) {
 422                     sb.append("wire "    +                 name +"_r;\n");
 423                     if (width>0)
 424                         sb.append("wire   ["+(width-1)+":0]" + name +";\n");
 425                 } else {
 426                     sb.append("reg "    +                  name +"_r;\n");
 427                     sb.append("initial " +                 name +"_r = 0;\n");
 428                     if (width>0) {
 429                         sb.append("reg    ["+(width-1)+":0]" + name +";\n");
 430                         if (!"/*NORESET*/".equals(resetBehavior))
 431                             sb.append("initial " +                 name +" = 0;\n");
 432                     }
 433                 }
 434                 return sb.toString();
 435             }
 436             public String doReset() {
 437                 return (forceNoLatch||latchDriver!=null||width==0)
 438                     ? name+"_r<=0;"
 439                     : hasLatch
 440                     ? (name+"_r<=0; "+("/*NORESET*/".equals(resetBehavior) ? "" : (name+"<=0;")))
 441                     : "";
 442             }
 443             public String getAssignments() {
 444                 StringBuffer sb = new StringBuffer();
 445                 if (external) {
 446                     sb.append("assign " +                  name +"_r_ = " + name + "_r;\n");
 447                     if (width>0)
 448                         sb.append("assign " +                  name +"_ = " + name + ";\n");
 449                 }
 450                 if (driven != null) {
 451                     sb.append("assign " + driven.name +"_r = " + name + "_r;\n");
 452                     sb.append("assign " + name +"_a = " + driven.name + "_a;\n");
 453                     if (width>0)
 454                         sb.append("assign " + driven.name +"   = " + name + ";\n");
 455                 }
 456                 if (driver != null) {
 457                     sb.append("assign " + name +"_r = " + driver.name + "_r;\n");
 458                     sb.append("assign " + driver.name +"_a = " + name + "_a;\n");
 459                     if (width>0 && !noDriveLatches)
 460                         sb.append("assign " + name +"   = " + driver.name + ";\n");
 461                 }
 462                 if (latchDriver != null) {
 463                     if (width>0)
 464                         sb.append("assign " + name +"   = " + latchDriver.getVerilogName() + ";\n");
 465                 }
 466                 return sb.toString();
 467             }
 468             public void connect(SinkPort driven) {
 469                 this.driven = driven;
 470                 throw new RuntimeException();
 471             }
 472         }
 473
 474         public void dump(PrintWriter pw, boolean fix) {
 475             pw.println("module "+name+"(clk, rst ");
 476             for(String name : portorder) {
 477                 Port p = ports.get(name);
 478                 pw.println("    , " + p.getInterface());
 479             }
 480             if (this.name.equals("root")) {
 481                 pw.println("    , dram_addr");
 482                 pw.println("    , dram_addr_r");
 483                 pw.println("    , dram_addr_a");
 484                 pw.println("    , dram_isread");
 485                 pw.println("    , dram_write_data");
 486                 pw.println("    , dram_write_data_push");
 487                 pw.println("    , dram_write_data_full");
 488                 pw.println("    , dram_read_data");
 489                 pw.println("    , dram_read_data_pop");
 490                 pw.println("    , dram_read_data_empty");
 491                 pw.println("    , dram_read_data_latency");
 492                 pw.println("    , vga_clk");
 493                 pw.println("    , vga_psave");
 494                 pw.println("    , vga_hsync");
 495                 pw.println("    , vga_vsync");
 496                 pw.println("    , vga_sync");
 497                 pw.println("    , vga_blank");
 498                 pw.println("    , vga_r");
 499                 pw.println("    , vga_g");
 500                 pw.println("    , vga_b");
 501                 pw.println("    , vga_clkout");
 502                 pw.println("    , ddr2_addr");
 503                 pw.println("    , ddr2_addr_r");
 504                 pw.println("    , ddr2_addr_a");
 505                 pw.println("    , ddr2_isread");
 506                 pw.println("    , ddr2_write_data");
 507                 pw.println("    , ddr2_write_data_push");
 508                 pw.println("    , ddr2_write_data_full");
 509                 pw.println("    , ddr2_read_data");
 510                 pw.println("    , ddr2_read_data_pop");
 511                 pw.println("    , ddr2_read_data_empty");
 512                 pw.println("    , ddr2_read_data_latency");
 513             }
 514             pw.println("   );");
 515             pw.println();
 516             pw.println("    input clk;");
 517             pw.println("    input rst;");
 518             if (this.name.equals("root")) {
 519                 pw.println("output  [31:0] dram_addr;");
 520                 pw.println("output         dram_addr_r;");
 521                 pw.println("input          dram_addr_a;");
 522                 pw.println("output         dram_isread;");
 523                 pw.println("output  [63:0] dram_write_data;");
 524                 pw.println("output         dram_write_data_push;");
 525                 pw.println("input          dram_write_data_full;");
 526                 pw.println("input   [63:0] dram_read_data;");
 527                 pw.println("output         dram_read_data_pop;");
 528                 pw.println("input          dram_read_data_empty;");
 529                 pw.println("input   [1:0]  dram_read_data_latency;");
 530                 pw.println("output  [31:0] ddr2_addr;");
 531                 pw.println("output         ddr2_addr_r;");
 532                 pw.println("input          ddr2_addr_a;");
 533                 pw.println("output         ddr2_isread;");
 534                 pw.println("output  [63:0] ddr2_write_data;");
 535                 pw.println("output         ddr2_write_data_push;");
 536                 pw.println("input          ddr2_write_data_full;");
 537                 pw.println("input   [63:0] ddr2_read_data;");
 538                 pw.println("output         ddr2_read_data_pop;");
 539                 pw.println("input          ddr2_read_data_empty;");
 540                 pw.println("input   [1:0]  ddr2_read_data_latency;");
 541                 pw.println("input          vga_clk;");
 542                 pw.println("output         vga_psave;");
 543                 pw.println("output         vga_hsync;");
 544                 pw.println("output         vga_vsync;");
 545                 pw.println("output         vga_sync;");
 546                 pw.println("output         vga_blank;");
 547                 pw.println("output   [7:0] vga_r;");
 548                 pw.println("output   [7:0] vga_g;");
 549                 pw.println("output   [7:0] vga_b;");
 550                 pw.println("output         vga_clkout;");
 551             }
 552             for(String name : ports.keySet()) {
 553                 Port p = ports.get(name);
 554                 pw.println("    " + p.getDeclaration());
 555             }
 556             for(StateWire sw : statewires.values())
 557                 sw.dump(pw);
 558             for(Latch l : latches.values())
 559                 l.dump(pw);
 560             for(String name : ports.keySet()) {
 561                 Port p = ports.get(name);
 562                 pw.println("    " + p.getAssignments());
 563             }
 564             for(InstantiatedModule m : instantiatedModules) {
 565                 m.dump(pw);
 566             }
 567             pw.println(precrap);
 568             pw.println("always @(posedge clk) begin");
 569             pw.println("  if (!rst) begin");
 570             for(Latch l : latches.values())
 571                 pw.println(l.doReset());
 572             for(StateWire sw : statewires.values())
 573                 pw.println(sw.doReset());
 574             for(Port p : ports.values())
 575                 pw.println(p.doReset());
 576             pw.println("  end else begin");
 577             for(Port p : ports.values()) {
 578                 if (p instanceof SourcePort) {
 579                     SourcePort ip = (SourcePort)p;
 580                     if (ip.hasLatch)
 581                         pw.println("if (!"+ip.getReq()+" && "+ip.getAck()+") "+ip.getAck()+"<=0;");
 582                 } else {
 583                     SinkPort op = (SinkPort)p;
 584                     if (op.hasLatch)
 585                         pw.println("if ("+op.getReq()+" && "+op.getAck()+") begin "+
 586                                    op.getReq()+"<=0; "+
 587                                    op.getResetBehavior()+" end");
 588                 }
 589             }
 590             for(Event a : events) a.dump(pw, fix);
 591             pw.println("    begin end");
 592             pw.println("    end");
 593             pw.println("  end");
 594
 595             pw.println(crap);
 596             pw.println("endmodule");
 597         }
 598
 599         public class Event {
 600             public Object[]  triggers;
 601             public Object[]  actions;
 602             public Event(Object[] triggers, Object action) { this(triggers, new Object[] { action }); }
 603             public Event(Object[] triggers, Object[] actions) {
 604                 Module.this.events.add(this);
 605                 this.triggers = triggers;
 606                 this.actions = actions;
 607                 for(int i=0; i<triggers.length; i++)
 608                     if (triggers[i] instanceof Port)
 609                         ((Port)triggers[i]).hasLatch = true;
 610             }
 611             public void dump(PrintWriter pw, boolean fix) {
 612                 pw.print("if (1");
 613                 for(Object o : triggers) {
 614                     if (o instanceof Trigger) pw.print(((Trigger)o).getVerilogTrigger());
 615                     else                      pw.print(" && " + o);
 616                 }
 617                 pw.println(") begin ");
 618                 for(Object a : actions) if (a!=null) pw.println(((Action)a).getVerilogAction());
 619                 if (fix) pw.println("end /*else*/ ");
 620                 else     pw.println("end else ");
 621             }
 622         }
 623     }
 624 }