347:
accessing it. This will notify to the master that the slave is busy but does not want to lose the communication. The slave device will allow continuation after its task is complete. There is no limit in the I²C-bus protocol as to how long this delay can be, whereas for an SMBus system, it would be limited to 35 ms. The SMBus protocol just assumes that if something takes too long, then it means that there is a problem on the bus and that all devices must reset in order to clear this mode. Slave devices are not then allowed to hold the clock LOW too long.
1462:
338:
devices to be ‘hot-plugged’ and used immediately, without restarting the system. The devices are recognized automatically and assigned unique addresses. This advantage results in a plug-and-play user interface. In both those protocols there is a very useful distinction made between a System Host and all the other devices in the system that can have the names and functions of masters or slaves.
316:
after the transfer of each byte and before the completion of the transaction. This is important because SMBus does not provide any other resend signaling. This difference in the use of the NACK signaling has implications on the specific implementation of the SMBus port, especially in devices that handle critical system data such as the SMBus host and the SBS components.
259:
The SMBus clock is defined from 10 to 100 kHz while I²C can be 0–100 kHz, 0–400 kHz, 0–1 MHz and 0–3.4 MHz, depending on the mode. This means that an I²C bus running at less than 10 kHz will not be SMBus compliant since the SMBus devices may time out. Many SMBus devices
346:
SMBus has a time-out feature which resets devices if a communication takes too long. This explains the minimum clock frequency of 10 kHz to prevent locking up the bus. I²C can be a ‘DC’ bus, meaning that a slave device stretches the master clock when performing some routine while the master is
307:
There are the following differences in the use of the NACK bus signaling: In I²C, a slave receiver is allowed to not acknowledge the slave address, if for example it's unable to receive because it's performing some real time task. SMBus requires devices to acknowledge their own address always, as a
315:
Other than to indicate a slave's device-busy condition, SMBus also uses the NACK mechanism to indicate the reception of an invalid command or datum. Since such a condition may occur on the last byte of the transfer, it is required that SMBus devices have the ability to generate the not acknowledge
81:
A device can provide manufacturer information, indicate its model/part number, save its state for a suspend event, report different types of errors, accept control parameters, return status over SMBus, and poll chipset registers. The SMBus is generally not user configurable or accessible. Although
337:
The SMBus uses I²C hardware and I²C hardware addressing, but adds second-level software for building special systems. In particular its specifications include an
Address Resolution Protocol that can make dynamic address allocations. Dynamic reconfiguration of the hardware and software allow bus
324:
Each message transaction on SMBus follows the format of one of the defined SMBus protocols. The SMBus protocols are a subset of the data transfer formats defined in the I²C specifications. I²C devices that can be accessed through one of the SMBus protocols are compatible with the SMBus
105:
serial bus protocol. Its clock frequency range is 10 kHz to 100 kHz. (PMBus extends this to 400 kHz.) Its voltage levels and timings are more strictly defined than those of I²C, but devices belonging to the two systems are often successfully mixed on the same bus.
311:
I²C specifies that a slave device, although it may acknowledge its own address, may decide, some time later in the transfer, that it cannot receive any more data bytes. I²C specifies that the device may indicate this by generating the not acknowledge on the first byte to follow.
389:
signal called SMBALERT#, which can be used by slaves to tell the host to ask its slaves about events of interest. SMBus also defines a less common "Host Notify
Protocol", providing similar notifications but passing more data and building on the I²C multi-master mode.
50:
for the purpose of lightweight communication. Most commonly it is found in chipsets of computer motherboards for communication with the power source for ON/OFF instructions. The exact functionality and hardware interfaces vary with vendors.
292:
The SMBus time-out specifications do not preclude I²C devices co-operating reliably on the SMBus. It is the responsibility of the designer to ensure that I²C devices are not going to violate these bus timing
136:
While SMBus is derived from I²C, there are several major differences between the specifications of the two busses in the areas of electricals, timing, protocols and operating modes.
213:
SMBus 2.0 defines a ‘High Power’ class that includes a 4 mA sink current that cannot be driven by I²C chips unless the pull-up resistor is sized to I²C-bus levels.
114:
502:
1791:
216:
NXP devices have a higher power set of electrical characteristics than SMBus 1.0. The main difference is the current sink capability with
1457:
Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.
1642:
1606:
1496:
902:
326:
1684:
1430:
325:
specifications. I²C devices that do not adhere to these protocols cannot be accessed by standard methods as defined in the SMBus and
118:
70:). Other devices might include external master hosts, temperature sensor, fan or voltage sensors, lid switches, clock generator, and
1059:
922:
1729:
729:
463:
1816:
1110:
781:
370:, calculated over the entire message including the address and read/write bit. The polynomial used is x+x+x+1 (the CRC-8-
816:
1714:
1672:
1163:
1002:
932:
469:
363:). In that mode, a PEC (packet error code) byte is appended at the end of each transaction. The byte is calculated as
992:
75:
1535:
1090:
237:
SMBus ‘high power’ devices and I²C-bus devices will work together if the pull-up resistor is sized for 3 mA.
1801:
1699:
1489:
882:
1754:
1434:
1085:
1054:
286:
as the cumulative clock low extend time for a master device. Again I²C does not have a similar specification.
707:
163:
When mixing devices, the I²C specification defines the input levels to be 30% and 70% of the supply voltage
1734:
1601:
1032:
481:
1689:
1358:
1297:
1152:
503:"DURACELL AND INTEL ANNOUNCE 'SMART BATTERY' SPECIFICATIONS FOR PORTABLE COMPUTERS - Free Online Library"
457:
1540:
602:
128:(SPD). SMBus has grown into a wide variety of system enumeration use cases other than power management.
1545:
957:
722:
371:
1327:
279:
as the cumulative clock low extend time for a slave device. I²C does not have a similar specification.
170:, which may be 5 V, 3.3 V, or some other value. Instead of relating the bus input levels to
1811:
1482:
1012:
1709:
272:
SMBus defines a clock low time-out, TIMEOUT of 35 ms. I²C does not specify any timeout limit.
1821:
1806:
1749:
1739:
1667:
1465:
1440:
1332:
987:
43:
1770:
1694:
1560:
1022:
125:
308:
mechanism to detect a removable device's presence on the bus (battery, docking station, etc.)
1796:
1596:
1525:
1239:
1095:
715:
435:
110:
17:
1282:
1135:
1017:
475:
83:
63:
8:
1194:
749:
440:
655:
62:, especially power related chips such as a laptop's rechargeable battery subsystem (see
1677:
738:
1652:
1611:
1184:
806:
742:
569:
374:
109:
SMBus is used as an interconnect in several platform management standards including:
1662:
1555:
917:
1719:
1047:
897:
877:
752:
587:
47:
548:
1348:
1042:
967:
892:
796:
771:
1785:
1565:
1420:
1307:
1199:
1147:
1130:
912:
811:
801:
776:
737:
451:
411:
1570:
1157:
1100:
952:
857:
177:, SMBus defines them to be fixed at 0.8 and 2.1 V. SMBus 2.0 supports
71:
630:
1575:
1425:
1404:
1322:
1167:
1105:
1080:
1007:
791:
786:
59:
1244:
1657:
1616:
1530:
1278:
977:
766:
423:
419:
702:
1724:
1704:
1580:
1550:
1302:
1292:
1259:
1254:
1189:
1064:
852:
837:
832:
527:
446:
386:
1520:
1474:
1312:
1249:
982:
842:
367:
289:
SMBus defines both rise and fall time of bus signals. I²C does not.
94:
86:
coalition has extended SMBus to include conventions allowing that.
124:
SMBus is used to access DRAM configuration information as part of
97:
in 1994. It carries clock, data, and instructions and is based on
1445:
1399:
1383:
1209:
1027:
972:
907:
862:
403:
399:
98:
82:
SMBus devices usually can't identify their functionality, a new
1378:
1269:
1234:
1229:
1224:
1219:
1037:
927:
887:
847:
407:
1363:
1274:
692:
102:
55:
1626:
1621:
1505:
1373:
1264:
1204:
1142:
1115:
997:
947:
872:
415:
364:
90:
697:
1647:
1368:
1353:
1214:
1125:
1120:
962:
67:
1317:
942:
937:
588:"APPLICATION NOTE 476 Comparing the I²C Bus to the SMBus"
549:"System Management Bus (SMBus) Specification Version 3.0"
528:"System Management Bus (SMBus) Specification Version 2.0"
685:
263:
SMBus 3.0 adds 400 kHz and 1 MHz bus speeds.
78:(PCI) add-in cards may connect to an SMBus segment.
564:
562:
543:
541:
115:
58:for communication with low-bandwidth devices on a
1783:
559:
538:
520:
1060:Coherent Accelerator Processor Interface (CAPI)
580:
184:ranging from 3 to 5 V. SMBus 3.0 supports
570:"I2C-bus specification and user manual Rev. 7"
332:
144:
1490:
723:
131:
240:
1643:Advanced Programmable Interrupt Controller
1607:Intel Communication Streaming Architecture
1497:
1483:
730:
716:
327:Advanced Configuration and Power Interface
1685:High-bandwidth Digital Content Protection
119:Intelligent Platform Management Interface
350:
260:will however support lower frequencies.
385:The SMBus has an extra optional shared
14:
1792:Computer-related introductions in 1995
1784:
1730:Platform Environment Control Interface
464:Platform Environment Control Interface
1478:
711:
302:
201:
1504:
693:Official SMBus specifications (free)
355:SMBus 1.1 and later define optional
27:Simple two-wire bus for motherboards
341:
24:
1715:Host Embedded Controller Interface
470:Host Embedded Controller Interface
319:
25:
1833:
677:
377:algorithm, initialized to zero).
191:ranging from 1.8 to 5 V and
76:Peripheral Component Interconnect
1461:
1460:
398:SMBus devices are supported by
648:
623:
595:
495:
13:
1:
1055:Intel Ultra Path Interconnect
488:
139:
1673:Active Management Technology
1602:MultiProcessor Specification
1033:Intel QuickPath Interconnect
1023:Direct Media Interface (DMI)
482:System Management Controller
380:
297:
7:
1817:Computer hardware standards
458:Serial Peripheral Interface
429:
333:Address Resolution Protocol
10:
1838:
1018:Compute Express Link (CXL)
603:"Designing with SMBus 2.0"
393:
132:SMBus/I²C Interoperability
1763:
1635:
1589:
1513:
1454:
1413:
1392:
1341:
1255:IEEE-1284 (parallel port)
1177:
1170:logical device interface)
1073:
825:
759:
266:
89:The SMBus was defined by
1710:Serial Digital Video Out
1700:Rapid Storage Technology
227:SMBus low power = 350 μA
1755:Ultra Path Interconnect
1740:Platform Controller Hub
1668:Intel Management Engine
329:(ACPI) specifications.
230:SMBus high power = 4 mA
1802:Out-of-band management
1771:Silicon Photonics Link
1735:QuickPath Interconnect
817:List of bus bandwidths
126:serial presence detect
1745:System Management Bus
1690:High Definition Audio
1597:Common Building Block
703:SMBus at tech-faq.com
436:List of network buses
357:Packet Error Checking
351:Packet Error Checking
111:Alert Standard Format
32:System Management Bus
1260:IEEE-1394 (FireWire)
998:PCI Extended (PCI-X)
590:. Maxim. 2000-12-01.
476:Power Management Bus
64:Smart Battery System
1101:Parallel ATA (PATA)
592:090429 maxim-ic.com
441:Embedded controller
54:It is derived from
1008:PCI Express (PCIe)
631:"CRC-8 Calculator"
507:Thefreelibrary.com
303:ACK and NACK usage
1779:
1778:
1653:Intel Turbo Boost
1612:Intel Inboard 386
1472:
1471:
1458:
1185:Apple Desktop Bus
1162:PCI Express (via
1121:Serial ATA (SATA)
807:Network on a chip
656:"CRC-8 for SMBus"
282:SMBus specifies T
275:SMBus specifies T
16:(Redirected from
1829:
1812:Battery charging
1695:Hub Architecture
1663:Intel Secure Key
1499:
1492:
1485:
1476:
1475:
1464:
1463:
1456:
918:HP Precision Bus
732:
725:
718:
709:
708:
689:
688:
686:Official website
671:
670:
668:
666:
652:
646:
645:
643:
641:
627:
621:
620:
618:
616:
607:
599:
593:
591:
584:
578:
576:
574:
566:
557:
555:
553:
545:
536:
534:
532:
524:
518:
517:
515:
513:
499:
342:Time-out feature
46:simple two-wire
21:
1837:
1836:
1832:
1831:
1830:
1828:
1827:
1826:
1782:
1781:
1780:
1775:
1759:
1720:Hyper-threading
1631:
1585:
1509:
1503:
1473:
1468:
1459:
1450:
1409:
1388:
1337:
1250:IEEE-488 (GPIB)
1173:
1069:
1048:Infinity Fabric
878:Europe Card Bus
821:
755:
736:
684:
683:
680:
675:
674:
664:
662:
654:
653:
649:
639:
637:
629:
628:
624:
614:
612:
605:
601:
600:
596:
586:
585:
581:
572:
568:
567:
560:
551:
547:
546:
539:
530:
526:
525:
521:
511:
509:
501:
500:
496:
491:
432:
396:
383:
353:
344:
335:
322:
320:SMBus protocols
305:
300:
285:
278:
269:
257:
253:
246:
221:
211:
207:
198:= 1.35 V.
196:
189:
182:
175:
168:
161:
157:
150:
145:Input Voltage (
142:
134:
28:
23:
22:
15:
12:
11:
5:
1835:
1825:
1824:
1822:Computer buses
1819:
1814:
1809:
1807:Intel products
1804:
1799:
1794:
1777:
1776:
1774:
1773:
1767:
1765:
1761:
1760:
1758:
1757:
1752:
1747:
1742:
1737:
1732:
1727:
1722:
1717:
1712:
1707:
1702:
1697:
1692:
1687:
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1670:
1665:
1660:
1655:
1650:
1645:
1639:
1637:
1633:
1632:
1630:
1629:
1624:
1619:
1614:
1609:
1604:
1599:
1593:
1591:
1587:
1586:
1584:
1583:
1578:
1573:
1568:
1563:
1558:
1553:
1548:
1543:
1538:
1533:
1528:
1523:
1517:
1515:
1511:
1510:
1502:
1501:
1494:
1487:
1479:
1470:
1469:
1455:
1452:
1451:
1449:
1448:
1443:
1438:
1428:
1423:
1417:
1415:
1411:
1410:
1408:
1407:
1402:
1396:
1394:
1390:
1389:
1387:
1386:
1381:
1376:
1371:
1366:
1361:
1359:Intel HD Audio
1356:
1351:
1349:ADAT Lightpipe
1345:
1343:
1339:
1338:
1336:
1335:
1330:
1325:
1320:
1315:
1310:
1305:
1300:
1295:
1290:
1272:
1267:
1262:
1257:
1252:
1247:
1242:
1237:
1232:
1227:
1222:
1217:
1212:
1207:
1202:
1197:
1192:
1187:
1181:
1179:
1175:
1174:
1172:
1171:
1160:
1155:
1150:
1145:
1140:
1139:
1138:
1133:
1123:
1118:
1113:
1108:
1103:
1098:
1093:
1088:
1083:
1077:
1075:
1071:
1070:
1068:
1067:
1062:
1057:
1052:
1051:
1050:
1043:HyperTransport
1040:
1035:
1030:
1025:
1020:
1015:
1010:
1005:
1000:
995:
990:
985:
980:
975:
970:
965:
960:
955:
950:
945:
940:
935:
930:
925:
920:
915:
910:
905:
900:
895:
890:
885:
880:
875:
870:
865:
860:
855:
850:
845:
840:
835:
829:
827:
823:
822:
820:
819:
814:
809:
804:
799:
797:Bus contention
794:
789:
784:
779:
774:
772:Front-side bus
769:
763:
761:
757:
756:
753:computer buses
735:
734:
727:
720:
712:
706:
705:
700:
695:
690:
679:
678:External links
676:
673:
672:
660:Picbasic.co.uk
647:
622:
594:
579:
558:
537:
519:
493:
492:
490:
487:
486:
485:
479:
473:
467:
461:
455:
449:
444:
438:
431:
428:
422:and newer and
395:
392:
382:
379:
352:
349:
343:
340:
334:
331:
321:
318:
304:
301:
299:
296:
295:
294:
290:
287:
283:
280:
276:
273:
268:
265:
256:
251:
244:
239:
235:
234:
233:I²C-bus = 3 mA
231:
228:
223:= 0.4 V.
219:
210:
205:
202:Sink Current (
200:
194:
187:
180:
173:
166:
160:
155:
148:
143:
141:
138:
133:
130:
26:
9:
6:
4:
3:
2:
1834:
1823:
1820:
1818:
1815:
1813:
1810:
1808:
1805:
1803:
1800:
1798:
1795:
1793:
1790:
1789:
1787:
1772:
1769:
1768:
1766:
1762:
1756:
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1728:
1726:
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1713:
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1708:
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1703:
1701:
1698:
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1688:
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1679:
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1669:
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1634:
1628:
1625:
1623:
1620:
1618:
1615:
1613:
1610:
1608:
1605:
1603:
1600:
1598:
1595:
1594:
1592:
1588:
1582:
1579:
1577:
1574:
1572:
1569:
1567:
1564:
1562:
1559:
1557:
1554:
1552:
1549:
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1544:
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1539:
1537:
1534:
1532:
1529:
1527:
1524:
1522:
1519:
1518:
1516:
1512:
1507:
1500:
1495:
1493:
1488:
1486:
1481:
1480:
1477:
1467:
1453:
1447:
1444:
1442:
1439:
1436:
1432:
1429:
1427:
1424:
1422:
1421:Multidrop bus
1419:
1418:
1416:
1412:
1406:
1403:
1401:
1398:
1397:
1395:
1391:
1385:
1382:
1380:
1377:
1375:
1372:
1370:
1367:
1365:
1362:
1360:
1357:
1355:
1352:
1350:
1347:
1346:
1344:
1340:
1334:
1331:
1329:
1328:External PCIe
1326:
1324:
1321:
1319:
1316:
1314:
1311:
1309:
1308:Parallel SCSI
1306:
1304:
1301:
1299:
1296:
1294:
1291:
1288:
1284:
1280:
1276:
1273:
1271:
1268:
1266:
1263:
1261:
1258:
1256:
1253:
1251:
1248:
1246:
1243:
1241:
1238:
1236:
1233:
1231:
1228:
1226:
1223:
1221:
1218:
1216:
1213:
1211:
1208:
1206:
1203:
1201:
1200:Commodore bus
1198:
1196:
1193:
1191:
1188:
1186:
1183:
1182:
1180:
1176:
1169:
1165:
1161:
1159:
1156:
1154:
1151:
1149:
1148:Fibre Channel
1146:
1144:
1141:
1137:
1134:
1132:
1129:
1128:
1127:
1124:
1122:
1119:
1117:
1114:
1112:
1109:
1107:
1104:
1102:
1099:
1097:
1094:
1092:
1089:
1087:
1084:
1082:
1079:
1078:
1076:
1072:
1066:
1063:
1061:
1058:
1056:
1053:
1049:
1046:
1045:
1044:
1041:
1039:
1036:
1034:
1031:
1029:
1026:
1024:
1021:
1019:
1016:
1014:
1011:
1009:
1006:
1004:
1001:
999:
996:
994:
991:
989:
986:
984:
981:
979:
976:
974:
971:
969:
966:
964:
961:
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812:Plug and play
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802:Bus mastering
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610:Sbs-forum.org
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452:Low Pin Count
450:
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412:DragonFly BSD
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37:
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19:
1797:Serial buses
1744:
1678:AMT versions
1590:Discontinued
1286:
953:TURBOchannel
867:
743:
663:. Retrieved
659:
650:
638:. Retrieved
634:
625:
613:. Retrieved
609:
597:
582:
522:
510:. Retrieved
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384:
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108:
88:
80:
72:RGB lighting
53:
44:single-ended
39:
35:
31:
29:
1750:Thunderbolt
1426:CoreConnect
1405:ExpressCard
1333:Thunderbolt
1323:Camera Link
1106:Bus and Tag
792:Address bus
787:Control bus
782:Daisy chain
293:parameters.
241:Frequency (
60:motherboard
1786:Categories
1617:Intel Play
1556:Skulltrail
1526:Centrino 2
1508:technology
1279:ACCESS.bus
1178:Peripheral
978:InfiniBand
973:HP GSC bus
767:System bus
665:27 October
640:27 October
615:27 October
512:27 October
489:References
424:Windows CE
420:Windows 98
140:Electrical
1725:Omni-Path
1705:SpeedStep
1551:Ultrabook
1514:Platforms
1240:Lightning
1190:Atari SIO
1065:SpaceWire
898:Zorro III
838:S-100 bus
833:SS-50 bus
826:Standards
746:standards
739:Technical
698:SBS forum
635:Smbus.org
556:smbus.org
535:smbus.org
447:Super I/O
387:interrupt
381:SMBALERT#
298:Protocols
1764:Upcoming
1521:Centrino
1466:Category
1441:Wishbone
1414:Embedded
1393:Portable
1313:Profibus
1245:DMX512-A
1131:Parallel
983:Ethernet
893:Zorro II
843:Multibus
744:de facto
430:See also
368:checksum
284:LOW:MEXT
277:LOW:SEXT
121:(IPMI).
117:(DASH),
95:Duracell
1636:Current
1566:Galileo
1446:SLIMbus
1400:PC Card
1384:TOSLINK
1074:Storage
1028:RapidIO
908:FASTBUS
863:STD Bus
760:General
577:nxp.com
478:(PMBus)
404:OpenBSD
400:FreeBSD
394:Support
113:(ASF),
99:Philips
42:) is a
1571:Edison
1541:Tablet
1379:S/PDIF
1270:1-Wire
1235:RS-485
1230:RS-423
1225:RS-422
1220:RS-232
1081:ST-506
1038:NVLink
888:STEbus
848:Unibus
472:(HECI)
466:(PECI)
408:NetBSD
267:Timing
1627:MMC-2
1622:MMC-1
1576:Curie
1506:Intel
1374:McASP
1342:Audio
1287:SMBus
1283:PMBus
1265:UNI/O
1205:HP-IL
1158:SATAe
1143:ESCON
1116:HIPPI
948:NuBus
903:CAMAC
873:Q-Bus
868:SMBus
853:VAXBI
750:wired
606:(PDF)
573:(PDF)
552:(PDF)
531:(PDF)
484:(SMC)
460:(SPI)
454:(LPC)
416:Linux
365:CRC-8
91:Intel
84:PMBus
36:SMBus
18:SMBus
1658:vPro
1648:CNVi
1546:CULV
1531:Viiv
1431:AMBA
1369:MADI
1354:AES3
1215:MIDI
1168:NVMe
1164:AHCI
1126:SCSI
1111:DSSI
1086:ESDI
963:SBus
923:EISA
858:MBus
748:for
741:and
667:2017
642:2017
617:2017
514:2017
443:(EC)
248:and
152:and
93:and
68:ACPI
66:and
30:The
1581:Evo
1561:NUC
1536:MID
1435:AXI
1364:I²S
1318:USB
1303:D²B
1298:SPI
1293:I3C
1275:I²C
1210:HIL
1195:DCB
1166:or
1153:SSA
1136:SAS
1096:SMD
1091:IPI
1013:AGP
1003:PXI
993:PCI
988:UPA
968:VLB
958:MCA
943:VPX
938:VXS
933:VXI
928:VME
913:LPC
883:ISA
375:HEC
372:ATM
361:PEC
252:MIN
245:MAX
103:I²C
56:I²C
48:bus
40:SMB
38:or
1788::
1285:,
1281:,
658:.
633:.
608:.
561:^
540:^
505:.
426:.
418:,
414:,
410:,
406:,
402:,
220:OL
206:OL
195:IH
188:DD
181:DD
174:DD
167:DD
156:IH
149:IL
101:'
74:.
1498:e
1491:t
1484:v
1437:)
1433:(
1289:)
1277:(
731:e
724:t
717:v
669:.
644:.
619:.
575:.
554:.
533:.
516:.
359:(
255:)
250:F
243:F
218:V
209:)
204:I
193:V
186:V
179:V
172:V
165:V
159:)
154:V
147:V
34:(
20:)
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