562:. Whilst this FIFO neither full nor empty, both sending and receiving threads may proceed without being blocked. However, when the FIFO is empty, the receiving thread will block at the next read. When it is full, the sending thread will block at the next send. A channel with actors in differing
1100:
935:
Handel-C was adopted by many
University Hardware Research groups after its release by ESL, as a result was able to establish itself as a hardware design tool of choice within the academic community, especially in the United Kingdom.
375:
until the corresponding listening thread is ready to receive the message. Likewise the receiving thread will block on a read statement until the sending thread executes the next send. Thus they may be used as a means of
573:
A thread may simultaneously wait on multiple channels, synchronous or asynchronous, acting upon the first one available given a specified order of priority or optionally executing an alternate path if none is ready.
247:
Handel-C can be compiled to a number of HDLs and then synthesised to the corresponding hardware. This frees developers to concentrate on the programming task at hand rather than the
371:. Channels can be defined as asynchronous or synchronous (with or without an inferred storage element respectively). A thread writing to a synchronous channel will be immediately
683:
have on the timing of the program, the following keywords are reserved for describing the practicalities of the FPGA environment or for the language elements sourced from Occam:
912:
In Handel-C, assignment and the delay command take one cycle. All other operations are "free". This allows programmers to manually schedule tasks and create effective
928:
hardware description languages developed by the hardware compilation group. Handel HDL evolved into Handel-C around early 1996. The technology developed at Oxford was
916:. By arranging loops in parallel with the correct delays, pipelines can massively increase data throughput, at the expense of increased hardware resource use.
1172:
1046:
1015:
1723:
1195:
1718:
939:
In early 2008, Celoxica's ESL business was acquired by
Agility, which developed and sold, among other products, ESL tools supporting Handel-C.
925:
51:
1728:
1133:
1373:
1343:
172:
64:
377:
284:
193:
1217:
1165:
559:
1358:
217:
39:
961:
932:
to mature as a cornerstone product for
Embedded Solutions Limited (ESL) in 1996. ESL was renamed Celoxica in September 2000.
1403:
1284:
1205:
240:
567:
197:
1398:
1158:
965:
83:
586:) in which they were declared, the scope is hierarchical in nature as declarations are in scope within sub blocks.
288:
1222:
1181:
264:
1640:
1378:
1264:
1247:
1232:
1227:
1106:
Ahmed Ablak; Issam Damaj; American
University of Kuwait (2016). "HTCC: Haskell to Handel-C Hardware Compiler".
229:
189:
1617:
1022:
221:
558:
Asynchronous channels provide a specified amount of storage for data passing through them in the form of a
1558:
1444:
680:
112:
35:
31:
27:
1568:
1459:
1449:
1274:
953:
563:
360:
244:
942:
In early 2009, Agility ceased operations after failing to obtain further capital investments or credit
1632:
1579:
1464:
1363:
1269:
913:
372:
209:
22:
1677:
1533:
1259:
1237:
1077:
981:
268:
225:
1553:
1469:
1139:
1111:
368:
280:
233:
135:
58:
1484:
1331:
1129:
1062:
1040:
929:
566:
is automatically asynchronous due to the need for at least one element of storage to mitigate
259:
Handel-C's subset of C includes all common C language features necessary to describe complex
1353:
1200:
1121:
123:
1587:
946:
364:
108:
46:
952:
Other subset C HDL's that developed around the same time are
Transmogrifier C in 1994 at
1689:
128:
116:
1712:
1660:
1645:
1517:
1439:
1326:
1143:
1602:
1592:
1242:
248:
267:
data types were omitted. Floating point arithmetic is supported through external
149:
1388:
1302:
1210:
1094:
104:
99:
1607:
1538:
1507:
1319:
260:
1672:
1667:
1650:
1612:
1419:
1297:
969:
1655:
1548:
1479:
1424:
1383:
1314:
986:
1125:
1622:
1512:
1474:
1338:
1292:
287:(CSP) keywords are used, along with the general file structure of the
1684:
1543:
1368:
1252:
1150:
877:
663:/* "a", "b" and "d" are within scope */
645:/* "a", "b" and "c" are within scope */
212:
aimed at low-level hardware and is most commonly used in programming
547:// this has the effect of blocking the sending thread between writes
1116:
1454:
1434:
1393:
957:
535:// perform a sequence of 10 reads from the channel into variable x
1597:
1309:
213:
1154:
1429:
544:// introduce a delay of 1 clock cycle between successive reads
582:
The scope of declarations are limited to the code blocks (
1108:
2016 Euromicro
Conference on Digital System Design (DSD)
472:// send the values 0 to 9 sequentially into the channel
630:/* "a" and "b" are within scope */
679:
In addition to the effects the standard semantics of
924:
The historical roots of Handel-C are in a series of
1631:
1578:
1567:
1526:
1500:
1493:
1412:
1283:
1188:
183:
170:
144:
134:
122:
98:
82:
70:
57:
45:
21:
1010:
1008:
1006:
1004:
1002:
251:of a specific design language and architecture.
216:. Handel-C is to hardware design what the first
1166:
8:
16:
1575:
1497:
1173:
1159:
1151:
1078:"Mentor buys Agility's C synthesis assets"
232:programming language, with an emphasis on
15:
1115:
279:In order to facilitate a way to describe
63:ESL; Celoxica; Agility; Mentor Graphics;
685:
210:high-level hardware description language
998:
949:acquired Agility's C synthesis assets.
1045:: CS1 maint: archived copy as title (
1038:
960:open source project) and Streams-C at
926:Oxford University Computing Laboratory
52:Oxford University Computing Laboratory
7:
1063:"Agility DS victim of credit crunch"
1051:Handel-C Language Reference Manual
285:communicating sequential processes
263:. Like many embedded C compilers,
14:
1076:Dylan McGrath (22 January 2009).
1061:Gabe Moretti (19 January 2009).
966:Impulse Accelerated Technologies
403:// declare a synchronous channel
218:high-level programming languages
703:< ... > (type clarifier)
129:Cross-platform (multi-platform)
1724:Hardware description languages
962:Los Alamos National Laboratory
1:
1719:C programming language family
243:(HDL) that target a specific
1729:Electronic design automation
675:Extensions to the C language
1095:Handel-C language resources
747:@ (concatenation operator)
1745:
578:Scope and variable sharing
289:Occam programming language
478:// begin receiving thread
271:that are very efficient.
241:hardware design languages
188:
178:
94:
78:
1265:Circuit underutilization
1248:Reconfigurable computing
591:
382:
363:provide a mechanism for
296:
415:// begin sending thread
717:? (read from channel)
714:(bit range selection)
706:! (send into channel)
1275:Hardware acceleration
954:University of Toronto
245:computer architecture
1465:Microchip Technology
1270:High-level synthesis
1110:. pp. 192–199.
220:were to programming
1534:Intel Quartus Prime
1260:Soft microprocessor
1126:10.1109/DSD.2016.24
982:High- and low-level
255:Additional features
228:rich subset of the
136:Filename extensions
71:First appeared
18:
1182:Programmable logic
1097:at Mentor Graphics
852:try { ... } reset
761:let ... ; in
689:Types and Objects
239:Unlike many other
234:parallel computing
1706:
1705:
1702:
1701:
1698:
1697:
1485:Texas Instruments
1135:978-1-5090-2817-7
964:(now licensed to
945:In January 2009,
905:
904:
281:parallel behavior
275:Parallel programs
203:
202:
100:Typing discipline
1736:
1576:
1498:
1175:
1168:
1161:
1152:
1147:
1119:
1082:
1081:
1073:
1067:
1066:
1058:
1052:
1050:
1044:
1036:
1034:
1033:
1027:
1021:. Archived from
1020:
1012:
797:internal_divide
755:external_divide
686:
670:
667:
664:
661:
658:
655:
652:
649:
646:
643:
640:
637:
634:
631:
628:
625:
622:
619:
616:
613:
610:
607:
604:
601:
598:
595:
585:
554:
551:
548:
545:
542:
539:
536:
533:
530:
527:
524:
521:
518:
515:
512:
509:
506:
503:
500:
497:
494:
491:
488:
485:
482:
479:
476:
473:
470:
467:
464:
461:
458:
455:
452:
449:
446:
443:
440:
437:
434:
431:
428:
425:
422:
419:
416:
413:
410:
407:
404:
401:
398:
395:
392:
389:
386:
369:parallel threads
351:
348:
345:
342:
339:
336:
333:
330:
327:
324:
321:
318:
315:
312:
309:
306:
303:
300:
166:
163:
161:
159:
157:
155:
153:
151:
47:Designed by
19:
1744:
1743:
1739:
1738:
1737:
1735:
1734:
1733:
1709:
1708:
1707:
1694:
1627:
1570:
1563:
1522:
1489:
1408:
1279:
1184:
1179:
1136:
1105:
1101:Oxford Handel-C
1091:
1086:
1085:
1075:
1074:
1070:
1060:
1059:
1055:
1037:
1031:
1029:
1025:
1018:
1016:"Archived copy"
1014:
1013:
1000:
995:
978:
968:under the name
947:Mentor Graphics
922:
910:
677:
672:
671:
668:
665:
662:
659:
656:
653:
650:
647:
644:
641:
638:
635:
632:
629:
626:
623:
620:
617:
614:
611:
608:
605:
602:
599:
596:
593:
583:
580:
556:
555:
552:
549:
546:
543:
540:
537:
534:
531:
528:
525:
522:
519:
516:
513:
510:
507:
504:
501:
498:
495:
492:
489:
486:
483:
480:
477:
474:
471:
468:
465:
462:
459:
456:
453:
450:
447:
444:
441:
438:
435:
432:
429:
426:
423:
420:
417:
414:
411:
408:
405:
402:
399:
396:
393:
390:
387:
384:
365:message passing
358:
353:
352:
349:
346:
343:
340:
337:
334:
331:
328:
325:
322:
319:
316:
313:
310:
307:
304:
301:
298:
277:
257:
226:turing-complete
173:implementations
148:
90:
12:
11:
5:
1742:
1740:
1732:
1731:
1726:
1721:
1711:
1710:
1704:
1703:
1700:
1699:
1696:
1695:
1693:
1692:
1687:
1682:
1681:
1680:
1675:
1665:
1664:
1663:
1653:
1648:
1643:
1637:
1635:
1629:
1628:
1626:
1625:
1620:
1615:
1610:
1605:
1600:
1595:
1590:
1584:
1582:
1573:
1565:
1564:
1562:
1561:
1556:
1551:
1546:
1541:
1536:
1530:
1528:
1524:
1523:
1521:
1520:
1515:
1510:
1504:
1502:
1495:
1491:
1490:
1488:
1487:
1482:
1477:
1472:
1467:
1462:
1457:
1452:
1447:
1442:
1437:
1432:
1427:
1422:
1416:
1414:
1410:
1409:
1407:
1406:
1401:
1396:
1391:
1386:
1381:
1376:
1371:
1366:
1361:
1356:
1351:
1346:
1341:
1336:
1335:
1334:
1324:
1323:
1322:
1317:
1307:
1306:
1305:
1300:
1289:
1287:
1281:
1280:
1278:
1277:
1272:
1267:
1262:
1257:
1256:
1255:
1245:
1240:
1235:
1230:
1225:
1220:
1215:
1214:
1213:
1203:
1198:
1192:
1190:
1186:
1185:
1180:
1178:
1177:
1170:
1163:
1155:
1149:
1148:
1134:
1103:
1098:
1090:
1089:External links
1087:
1084:
1083:
1080:. EETimes.com.
1068:
1065:. EETimes.com.
1053:
997:
996:
994:
991:
990:
989:
984:
977:
974:
921:
918:
909:
906:
903:
902:
900:
898:
894:
893:
891:
889:
885:
884:
882:
880:
874:
873:
870:
868:
864:
863:
860:
858:
854:
853:
850:
848:
844:
843:
840:
838:
834:
833:
830:
828:
824:
823:
820:
818:
814:
813:
810:
808:
804:
803:
800:
798:
794:
793:
790:
788:
784:
783:
780:
778:
774:
773:
770:
767:
763:
762:
759:
756:
752:
751:
748:
745:
741:
740:
737:
734:
730:
729:
726:
723:
719:
718:
715:
712:
708:
707:
704:
701:
697:
696:
693:
690:
676:
673:
592:
579:
576:
383:
357:
354:
297:
276:
273:
265:floating point
256:
253:
249:idiosyncrasies
201:
200:
186:
185:
181:
180:
176:
175:
168:
167:
146:
142:
141:
138:
132:
131:
126:
120:
119:
102:
96:
95:
92:
91:
88:
86:
84:Stable release
80:
79:
76:
75:
72:
68:
67:
61:
55:
54:
49:
43:
42:
25:
13:
10:
9:
6:
4:
3:
2:
1741:
1730:
1727:
1725:
1722:
1720:
1717:
1716:
1714:
1691:
1688:
1686:
1683:
1679:
1676:
1674:
1671:
1670:
1669:
1666:
1662:
1659:
1658:
1657:
1654:
1652:
1649:
1647:
1646:LatticeMico32
1644:
1642:
1639:
1638:
1636:
1634:
1630:
1624:
1621:
1619:
1616:
1614:
1611:
1609:
1606:
1604:
1601:
1599:
1596:
1594:
1591:
1589:
1586:
1585:
1583:
1581:
1577:
1574:
1572:
1566:
1560:
1557:
1555:
1552:
1550:
1547:
1545:
1542:
1540:
1537:
1535:
1532:
1531:
1529:
1525:
1519:
1516:
1514:
1511:
1509:
1506:
1505:
1503:
1499:
1496:
1492:
1486:
1483:
1481:
1478:
1476:
1473:
1471:
1468:
1466:
1463:
1461:
1458:
1456:
1453:
1451:
1448:
1446:
1443:
1441:
1438:
1436:
1433:
1431:
1428:
1426:
1423:
1421:
1418:
1417:
1415:
1411:
1405:
1402:
1400:
1397:
1395:
1392:
1390:
1387:
1385:
1382:
1380:
1377:
1375:
1372:
1370:
1367:
1365:
1362:
1360:
1357:
1355:
1352:
1350:
1347:
1345:
1342:
1340:
1337:
1333:
1330:
1329:
1328:
1327:SystemVerilog
1325:
1321:
1318:
1316:
1313:
1312:
1311:
1308:
1304:
1301:
1299:
1296:
1295:
1294:
1291:
1290:
1288:
1286:
1282:
1276:
1273:
1271:
1268:
1266:
1263:
1261:
1258:
1254:
1251:
1250:
1249:
1246:
1244:
1241:
1239:
1236:
1234:
1231:
1229:
1226:
1224:
1221:
1219:
1216:
1212:
1209:
1208:
1207:
1204:
1202:
1199:
1197:
1194:
1193:
1191:
1187:
1183:
1176:
1171:
1169:
1164:
1162:
1157:
1156:
1153:
1145:
1141:
1137:
1131:
1127:
1123:
1118:
1113:
1109:
1104:
1102:
1099:
1096:
1093:
1092:
1088:
1079:
1072:
1069:
1064:
1057:
1054:
1048:
1042:
1028:on 2010-03-31
1024:
1017:
1011:
1009:
1007:
1005:
1003:
999:
992:
988:
985:
983:
980:
979:
975:
973:
971:
967:
963:
959:
955:
950:
948:
943:
940:
937:
933:
931:
927:
919:
917:
915:
907:
901:
899:
896:
895:
892:
890:
887:
886:
883:
881:
879:
876:
875:
871:
869:
866:
865:
861:
859:
856:
855:
851:
849:
846:
845:
841:
839:
836:
835:
831:
829:
826:
825:
821:
819:
816:
815:
811:
809:
806:
805:
801:
799:
796:
795:
791:
789:
786:
785:
781:
779:
776:
775:
771:
768:
765:
764:
760:
757:
754:
753:
750:set intwidth
749:
746:
743:
742:
738:
736:<- (take)
735:
732:
731:
727:
724:
721:
720:
716:
713:
710:
709:
705:
702:
699:
698:
694:
691:
688:
687:
684:
682:
674:
590:
589:For example:
587:
577:
575:
571:
569:
568:metastability
565:
564:clock domains
561:
381:
379:
378:synchronizing
374:
370:
366:
362:
355:
295:
294:For example:
292:
290:
286:
282:
274:
272:
270:
266:
262:
254:
252:
250:
246:
242:
237:
235:
231:
227:
223:
219:
215:
211:
207:
199:
195:
191:
187:
184:Influenced by
182:
177:
174:
169:
165:
147:
143:
139:
137:
133:
130:
127:
125:
121:
118:
114:
110:
106:
103:
101:
97:
93:
87:
85:
81:
77:
73:
69:
66:
62:
60:
56:
53:
50:
48:
44:
41:
37:
33:
29:
26:
24:
20:
1603:LatticeMico8
1593:ARM Cortex-M
1569:Intellectual
1348:
1107:
1071:
1056:
1030:. Retrieved
1023:the original
951:
944:
941:
938:
934:
923:
911:
792:releasesema
692:Expressions
678:
588:
581:
572:
557:
359:
293:
283:some of the
278:
258:
238:
205:
204:
1633:Open-source
1580:Proprietary
1389:Flow to HDL
1211:Logic block
817:macro proc
812:set family
733:macro expr
695:Statements
179:Celoxica DK
65:Siemens EDA
1713:Categories
1608:MicroBlaze
1559:Simulators
1539:Xilinx ISE
1117:1907.07764
1032:2010-03-31
993:References
908:Scheduling
888:undefined
832:set reset
802:set clock
777:interface
725:\\ (drop)
261:algorithms
224:. It is a
162:/precision
140:.hcc, .hch
40:concurrent
36:structured
32:procedural
28:Imperative
1678:Microwatt
1673:Libre-SOC
1668:Power ISA
1651:OpenCores
1613:PicoBlaze
1420:Accellera
1413:Companies
1285:Languages
970:Impulse C
956:(now the
914:pipelines
822:set part
787:internal
744:external
739:ifselect
380:threads.
269:libraries
59:Developer
1656:OpenRISC
1571:property
1549:ModelSim
1527:Software
1501:Hardware
1494:Products
1480:Synopsys
1450:Infineon
1425:Achronix
1384:C to HDL
1349:Handel-C
1189:Concepts
1144:13213191
1041:cite web
987:C to HDL
976:See also
930:spun off
862:trysema
722:chanout
367:between
361:Channels
356:Channels
206:Handel-C
154:.siemens
117:inferred
109:manifest
89:v3.0
23:Paradigm
17:Handel-C
1623:Nios II
1513:Stratix
1475:Siemens
1460:Lattice
1445:Cadence
1339:SystemC
1293:Verilog
920:History
867:signal
857:shared
782:prialt
766:inline
758:select
711:chanin
584:{ ... }
373:blocked
145:Website
113:nominal
1685:RISC-V
1544:Vivado
1518:Virtex
1404:Chisel
1369:PALASM
1253:Xputer
1142:
1132:
878:typeof
807:mpram
769:width
728:delay
171:Major
158:/en-US
105:Static
1455:Intel
1435:Aldec
1394:MyHDL
1320:VITAL
1140:S2CID
1112:arXiv
1026:(PDF)
1019:(PDF)
958:FpgaC
872:with
847:sema
700:chan
538:delay
214:FPGAs
208:is a
198:occam
1661:1200
1618:Nios
1598:LEON
1399:ELLA
1379:CUPL
1374:ABEL
1354:Lola
1344:AHDL
1310:VHDL
1243:PSoC
1223:EPLD
1218:CPLD
1206:FPGA
1196:ASIC
1130:ISBN
1047:link
897:wom
842:seq
837:rom
827:ram
772:par
612:void
606:main
603:void
560:FIFO
502:<
439:<
391:chan
222:CPUs
156:.com
74:1996
1690:Zet
1641:JOP
1588:ARC
1554:VTR
1508:iCE
1470:NXP
1440:Arm
1430:AMD
1364:UPF
1359:PSL
1332:DPI
1315:AMS
1303:AMS
1238:GAL
1233:PAL
1228:PLA
1201:SoC
1122:doi
654:int
636:int
621:int
594:int
481:seq
418:seq
406:int
394:int
385:par
299:par
236:.
194:CSP
160:/ic
152:.sw
150:eda
38:),
1715::
1138:.
1128:.
1120:.
1043:}}
1039:{{
1001:^
972:)
570:.
514:++
505:10
451:++
442:10
305:++
291:.
196:,
192:,
124:OS
115:,
111:,
107:,
34:,
1298:A
1174:e
1167:t
1160:v
1146:.
1124::
1114::
1049:)
1035:.
681:C
669:}
666:}
660:;
657:d
651:{
648:}
642:;
639:c
633:{
627:;
624:b
618:{
615:)
609:(
600:;
597:a
553:}
550:}
541:;
532:;
529:x
526:?
523:a
520:{
517:)
511:j
508:;
499:j
496:;
493:0
490:=
487:j
484:(
475:}
469:;
466:i
463:!
460:a
457:{
454:)
448:i
445:;
436:i
433:;
430:0
427:=
424:i
421:(
412:;
409:x
400:;
397:a
388:{
350:}
347:;
344:e
341:+
338:d
335:=
332:b
329:;
326:e
323:+
320:d
317:=
314:a
311:;
308:c
302:{
230:C
190:C
164:/
30:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.