55:
73:
47:
284:
202:
The Am7990 handles a decoded and clock-recovered
Ethernet bitstream complete with a collision-detection flag. Specifically, the Am7990 contains neither the Manchester encoder/decoder and associated PLL nor the necessary PECL line drivers/receivers to drive the
241:
The old LANCE (Rev. C) chips have a bug which causes garbage to be inserted in front of the received packet. The workaround is to ignore packets with an invalid destination address (garbage will usually not match). Of course, this precludes
646:
27:(MAC) controller introduced in 1985. LANCE, short for "local area network controller for Ethernet", is also the brand name for follow-up versions of the chip. Its architecture is the basis for
155:
II and PCnet-FAST) is LANCE software compatible. This means you should be able use the original 16-bit software on these members of the PCnet family of single-chip
Ethernet controllers.
31:'s PCnet family of highly integrated single-chip Ethernet controllers, which succeeded the LANCE family. The one exception is the Am79C940 MAC. The Am7990 chip was fabricated in
140:
The datasheet for the CMOS version states that the CMOS and NMOS versions are the same. But the "Table B-1. Comparison
Summary of the C-LANCE and LANCE Devices" in the
58:
Typical application with Am7990 MAC on the left next to Am7992 Manchester encoder/decoder (Serial
Interface Adapter) and AUI isolation transformer in the bottom right.
210:
The AUI interface can then be connected to any AUI-compatible transceiver, which AMD (among other manufacturers) produced as well, e.g. the Am7996 transceivers for
54:
695:
233:
integrated both the MAC and as well as SIA (for AUI) and 10BASE-T PHY on a single chip, while retaining software compatibility to the Am7990.
627:
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interface. These functions are typically handled by the companion Am7992 "Serial
Interface Adapter" chip manufactured in a bipolar process.
593:
116:
83:
542:
661:
612:
394:
148:
163:
The Am7990 can handle 10 megabit/s
Ethernet with back-to-back packet reception with as little as 0,5 Ξs interframe spacing.
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715:
191:
98:
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267:
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technology. The original NMOS version Am7990 and the CMOS Am79C90 version differ in some details which may affect
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176:
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24-bit (16M) address capable. Up to 128 ring buffers can be used. 48 byte receive/transmit FIFO. Operates with
680:
24:
28:
725:
187:
164:
144:
shows they differ. These differences are not likely to require modifications of any device driver.
631:
250:
SANA-II network interface API has poor multicast support, and this chip bug might be the reason.
260:
External loopback on a live network may cause reception of invalid loopback failure indications.
453:
391:
315:
597:
449:
404:
351:
152:
366:
36:
514:
337:
computers could have an expansion card that provided
Ethernet via this chipset. AUI only.
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709:
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168:
134:
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A later re-fabricated chip called the C-LANCE Am79C90 is made with 0.8 micrometre
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271:
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package is used. CSR0 slave read data can cause timing violations on DAL lines.
482:
469:
312:
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Receive descriptor zero byte count buffer interpreted as 4096 available bytes.
32:
328:
243:
141:
46:
543:"Am79C90 : CMOS Local Area Network Controller for Ethernet (C-LANCE)"
428:
303:
219:
40:
21:
494:
461:
416:
408:
380:
230:
226:
215:
211:
681:"Linux Ethernet-Howto: Vendor/Manufacturer/Model Specific Information"
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412:
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101:. Statements consisting only of original research should be removed.
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354:
345:
306:
293:
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247:
53:
45:
435:
401:
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66:
222:
transceivers like the Am79C98 and Am79C100 were introduced.
292:
Amiga 2065, the first
Ethernet controller for Commodore's
427:
An software implementation of an Am7990 is available in
300:
bus interface and is equipped with the NMOS Am7990 chip.
225:
Later "PCnet"-branded devices like the Am79C960 for the
90:
254:
No capability for transmit buffer byte count of zero.
218:
networks. With the advent of twisted-pair
Ethernet,
537:
535:
647:"comp.unix.admin, How to know Sun CPU type, 1993"
257:Receive lockup may occur if bus latency is large.
147:The PCnet family of Ethernet controllers (PCnet-
613:"Amiga Linux/68k A2065 Ethernet Driver a2065.h"
442:architecture (sun4m) virtual network interface.
8:
515:"Net186 Demonstration Board User's Manual"
117:Learn how and when to remove this message
506:
400:(some called NE1500 and NE2100). Under
39:(ENDEC) nor does it have an integrated
309:Ethernet controllers (like the DELQA).
179:(TDR) with a granularity of 30 meter.
579:"fxr.watson.org: sys/dev/le/am7990.c"
497:- 1999, Realtek 8139 PCI network chip
287:AMD Am7990DC from SGI IP6 motherboard
7:
491:- 1987, Novell's NE2000 network card
14:
468:CPU. One example architecture is
35:technology and has no integrated
71:
662:"1993: SUMMARY min info script"
485:- 1994, 3Com 3c509 network card
1:
175:supply and logic. Features a
696:"FreeBSD 7.1R manpage le(4)"
685:090428 mm.iit.uni-miskolc.hu
628:"Suns-at-Home Digest V10 #2"
383:-based motherboard Ethernet.
274:for new packets to transmit.
97:the claims made and adding
742:
377:Whitechapel Computer Works
270:computer memory every 1.6
37:Manchester encoder/decoder
602:090426 amiga-hardware.com
331:architecture motherboard.
229:and the AM79C970 for the
177:Time-domain reflectometer
651:090427 groups.google.com
423:is usually called le(4).
398:network interface cards
25:media access controller
670:090427 sunmanagers.org
636:090427 net-kitchen.com
288:
59:
51:
583:090426 fxr.watson.org
448:with le(4) emulating
429:emulated environments
373:computer motherboard.
294:Amiga computer family
286:
57:
49:
559:on 20 September 2021
313:DECstation 2100/3100
183:maximum frequency.
151:II, PCnet-32, PCnet-
50:AMD Am7990 Lance die
721:Integrated circuits
716:Networking hardware
700:090426 freebsd.org
617:090427 cvs.osdn.jp
594:"Commodore: A2065"
529:AMD.com â TechDocs
289:
82:possibly contains
60:
52:
405:operating systems
392:Personal computer
316:MIPS architecture
127:
126:
119:
84:original research
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669:
664:. Archived from
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630:. Archived from
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596:. Archived from
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552:. Archived from
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511:
371:SPARCstation IPX
352:Sun Microsystems
348:IP6 motherboard.
335:AT&T UNIX PC
182:
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115:
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99:inline citations
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470:DECstation 5000
367:SPARCstation 10
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137:compatibility.
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5:
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668:on 2011-07-26.
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634:on 2011-07-14.
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600:on 2013-01-20.
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550:AMD â TechDocs
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363:SPARCstation 2
359:SPARCstation 1
355:Sun Hydra 3/80
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296:. It uses the
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342:Personal Iris
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198:Related chips
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186:Physically a
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169:Bus mastering
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135:device driver
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107:November 2010
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92:
86:
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80:This section
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68:
63:Compatibility
62:
56:
48:
44:
43:transceiver.
42:
38:
34:
30:
26:
23:
19:
726:AMD products
690:
675:
666:the original
656:
641:
632:the original
622:
607:
598:the original
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573:
561:. Retrieved
554:the original
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521:. Retrieved
509:
426:
325:DEC 3000 AXP
240:
224:
209:
201:
185:
173:5 volt DC 5%
162:
146:
139:
128:
113:
104:
81:
17:
15:
419:/Linux the
319:motherboard
710:Categories
563:22 January
523:22 January
502:References
483:3Com 3c509
438:emulating
91:improve it
329:Alpha AXP
321:Ethernet.
244:multicast
237:Chip bugs
142:datasheet
95:verifying
477:See also
386:Various
304:MicroVAX
298:Zorro-II
220:10BASE-T
181:16,8 MHz
159:Features
41:10BASE-T
22:Ethernet
495:RTL8139
472:(3max).
462:PowerPC
417:OpenBSD
409:FreeBSD
381:NS32016
327:64-bit
231:PCI bus
227:ISA bus
216:10BASE2
212:10BASE5
192:PLCC-68
89:Please
489:NE2000
466:SuperH
464:, and
446:GXemul
413:NetBSD
188:DIP-48
20:is an
18:Am7990
557:(PDF)
546:(PDF)
518:(PDF)
440:Sun-4
407:like
379:MG-1
346:R3000
344:MIPS
307:Q-Bus
266:Will
248:Amiga
565:2021
525:2021
458:M88K
454:MIPS
436:QEMU
402:Unix
369:and
340:SGI
279:Uses
268:poll
214:and
131:CMOS
33:NMOS
16:The
450:ARM
395:ISA
388:x86
205:AUI
190:or
165:DMA
153:PCI
149:ISA
93:by
29:AMD
712::
548:.
534:^
460:,
456:,
452:,
431::
365:,
361:,
357:,
272:ms
698:.
683:.
649:.
615:.
581:.
567:.
527:.
415:/
411:/
390:-
167:/
120:)
114:(
109:)
105:(
87:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
