AMD Lance Am7990
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AMD Lance Am7990 IEEE 802.3 AMD.com – TechDocs Ethernet
Media Access Control In IEEE 802 LAN/MAN standards, the medium access control (MAC, also called media access control) sublayer is the layer that controls the hardware responsible for interaction with the wired, optical or wireless transmission medium. The MAC sublay ...
ler (MAC) controller were introduced in 1985. AMD.com – TechDocs Its architecture is the basis for
AMD Advanced Micro Devices, Inc. (AMD) is an American multinational semiconductor company based in Santa Clara, California, that develops computer processors and related technologies for business and consumer markets. While it initially manufactur ...
's PCnet Family of highly integrated single-chip Ethernet controllers. The one exception is the Am79C940 MAC. The Am7990 chip was fabricated in NMOS technology and has no integrated
Manchester Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The t ...
encoder/decoder (ENDEC) nor does it have an integrated 10BASE-T transceiver.


Compatibility

A later re-fabricated chip called the C-LANCE Am79C90 is made with 0.8 micrometre CMOS technology. The original NMOS version Am7990 and the CMOS Am79C90 version differ in some details which may affect device driver compatibility. 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
datasheet A datasheet, data sheet, or spec sheet is a document that summarizes the performance and other characteristics of a product, machine, component (e.g., an electronic component), material, subsystem (e.g., a power supply), or software in suffici ...
shows they differ. These differences are not likely to require modifications of any device driver. The PCnet family of Ethernet controllers (PCnet- ISA II, PCnet-32, PCnet- PCI 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.


Features

The Am7990 can handle 10BASE-5 Type A,
10BASE-2 10BASE2 (also known as cheapernet, thin Ethernet, thinnet, and thinwire) is a variant of Ethernet that uses thin coaxial cable terminated with BNC connectors to build a local area network. During the mid to late 1980s this was the dominan ...
Type B, and 10BASE-T. Back-to-back packet reception with as little as 0,5 μs interframe spacing. DMA/
Bus mastering In computing, bus mastering is a feature supported by many bus architectures that enables a device connected to the bus to initiate direct memory access (DMA) transactions. It is also referred to as first-party DMA, in contrast with third-party ...
24-bit (16M) address capable. Up to 128 ring buffers can be used. 48 byte receive/transmit FIFO. Operates with supply and logic. Features a
Time-domain reflectometer A time-domain reflectometer (TDR) is an electronic instrument used to determine the characteristics of electrical lines by observing reflected waveforms. It can be used to characterize and locate faults in metallic cables (for example, twisted pa ...
(TDR) with a granularity of 30 meter. maximum frequency. Physically a DIP-48 or PLCC-68 package is used. CSR0 slave read data can cause timing violations on DAL lines.


Chip bugs

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
multicast In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with ...
support. 090426 fxr.watson.org The Amiga SANA-II network interface API has poor multicast support, and this chip bug might be the reason. * No capability for transmit buffer byte count of zero. * Receive lockup may occur if bus latency is large. * External loopback on a live network may cause reception of invalid loopback failure indications. * Receive descriptor zero byte count buffer interpreted as 4096 available bytes. * Will
poll Poll, polled, or polling may refer to: Figurative head counts * Poll, a formal election ** Election verification exit poll, a survey taken to verify election counts ** Polling, voting to make decisions or determine opinions ** Polling places o ...
computer memory every 1.6 ms for new packets to transmit.


Uses

* Amiga 2065 the first Ethernet controller for Amiga computer family. Uses the Zorro-II bus interface and equipped with the NMOS Am7990 chip. 090426 amiga-hardware.com 090427 cvs.osdn.jp *
MicroVAX The MicroVAX is a discontinued family of low-cost minicomputers developed and manufactured by Digital Equipment Corporation (DEC). The first model, the MicroVAX I, was introduced in 1983.(announced October 1983) They used processors that implemen ...
Q-Bus The Q-bus,Schmidt, Atlant G.,Unibus,Q-Bus and VAXBI Bus, in ''Digital bus handbook'', Di Giacomo Joseph Ed., McGraw Hill, 1990 also known as the LSI-11 Bus, is one of several bus technologies used with PDP and MicroVAX computer systems previo ...
Ethernet controllers (like the DELQA). * DECstation 2100/3100
MIPS architecture MIPS (Microprocessor without Interlocked Pipelined Stages) is a family of reduced instruction set computer (RISC) instruction set architectures (ISA)Price, Charles (September 1995). ''MIPS IV Instruction Set'' (Revision 3.2), MIPS Technologies, ...
motherboard Ethernet. *
DEC 3000 AXP DEC 3000 AXP was the name given to a series of computer workstations and servers, produced from 1992 to around 1995 by Digital Equipment Corporation. The DEC 3000 AXP series formed part of the first generation of computer systems based on the 64- ...
64-bit
Alpha AXP Alpha (original name Alpha AXP) is a 64-bit reduced instruction set computer (RISC) instruction set architecture (ISA) developed by Digital Equipment Corporation (DEC). Alpha was designed to replace 32-bit VAX complex instruction set computers ( ...
architecture motherboard. *
AT&T UNIX PC The AT&T UNIX PC is a Unix desktop computer originally developed by Convergent Technologies (later acquired by Unisys), and marketed by AT&T Information Systems in the mid- to late-1980s. The system was codenamed "Safari 4" and is also known as th ...
computers could have an expansion card that provided Ethernet via this chipset. AUI only. * SGI Personal Iris MIPS
R3000 The R3000 is a 32-bit RISC microprocessor chipset developed by MIPS Computer Systems that implemented the MIPS I instruction set architecture (ISA). Introduced in June 1988, it was the second MIPS implementation, succeeding the R2000 as the flag ...
IP6 motherboard. * Sun Microsystems Sun Hydra 3/80, 090427 net-kitchen.com
SPARCstation 1 The SPARCstation 1 (Sun 4/60, code-named ''Campus'') is the first of the SPARCstation series of SPARC-based computer workstations sold by Sun Microsystems. The design originated in 1987 by a Sun spin-off company, Unisun, which was soon re-acquired ...
, SPARCstation 2, 090427 groups.google.com SPARCstation 10 and SPARCstation IPX 090427 sunmanagers.org computer motherboard. * Whitechapel Computer Works MG-1
NS32016 The NS32000, sometimes known as the 32k, is a series of microprocessors produced by National Semiconductor. The first member of the family came to market in 1982, briefly known as the 16032 before becoming the 32016. It was the first 32-bit general ...
-based motherboard Ethernet. * Various
x86 x86 (also known as 80x86 or the 8086 family) is a family of complex instruction set computer (CISC) instruction set architectures initially developed by Intel based on the Intel 8086 microprocessor and its 8088 variant. The 8086 was intr ...
-
Personal computer A personal computer (PC) is a multi-purpose microcomputer whose size, capabilities, and price make it feasible for individual use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or tec ...
ISA network interface cards (some called NE1500 and NE2100 090428 mm.iit.uni-miskolc.hu). Under
Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, an ...
operating system An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also i ...
s like FreeBSD/ NetBSD/ OpenBSD/Linux the device driver is usually called le(4). 090426 freebsd.org *
QEMU QEMU is a free and open-source emulator (Quick EMUlator). It emulates the machine's central processing unit, processor through dynamic binary translation and provides a set of different hardware and device models for the machine, enabling it t ...
emulating
Sun-4 Sun-4 is a series of Unix workstations and servers produced by Sun Microsystems, launched in 1987. The original Sun-4 series were VMEbus-based systems similar to the earlier Sun-3 series, but employing microprocessors based on Sun's own SPARC V7 RIS ...
architecture (sun4m) virtual network interface. *
GXemul Gavare's eXperimental Emulator (formerly known as mips64emul) is a computer architecture emulator being developed by Anders Gavare. It is available as free software under a revised BSD-style license. In 2005, Gavare changed the name of the softwar ...
with le(4) emulating
ARM In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between th ...
, MIPS, M88K, PowerPC, and
SuperH SuperH (or SH) is a 32-bit reduced instruction set computing (RISC) instruction set architecture (ISA) developed by Hitachi and currently produced by Renesas. It is implemented by microcontrollers and microprocessors for embedded systems. At the ...
CPU. One example architecture is DECstation 5000 (3max).


See also

*
Ethernet Ethernet () is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 1 ...
*
NE2000 The NE1000 and NE2000 are members of an early line of low cost Ethernet network cards introduced by Novell in 1987. Its popularity had a significant impact on the pervasiveness of networks in computing. They are based on a National Semiconductor ...
- 1987, Novell's NE2000 network card * 3Com 3c509 - 1994, 3Com 3c509 network card * RTL8139 - 1999, Realtek 8139 PCI network chip


References

{{DEFAULTSORT:Amd Lance Am7990 Networking hardware Integrated circuits Lance Am7990