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20381 Datasheet

  • 20381

  • Magic Packet Technology Application in Hardware and Software...

  • 29頁

  • ETC

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Magic Packet Technology Application
in Hardware and Software
Application Note
ABSTRACT
This application note addresses the use of the Magic Packet technology in conjunction with green
PC hardware and system-level software. Its objective is to assist individuals in using this new tech-
nology in their own environments.
INTRODUCTION
Over the last few years, two technologies have evolved
that seem to be competing rather than complementing
each other at the PC desktop. These technologies are
network technology and green PC technology. The
connectivity rate in large companies using network
technology has been increasing exponentially. This
trend has resulted in an on-going need for network
m a n a g e m e n t a n d fo r n e t w o r k m a n a g e r s t o
have access to PCs on their networks. At the same
time, the concept of green PCs has gained momentum
because the Environmental Protection Agency (EPA)
began encouraging the use of low-power computers to
conserve energy.
Network administrators and Information Systems (IS)
personnel in large companies are required to perform
tasks, such as backups or installation of software up-
grades, at remote sites at night when system downtime
does not impact the users. However, these tasks per-
formed after hours require the users to leave their ma-
chines on overnight, resulting in twice as much
electricity consumed as daytime usage (16 hrs. vs. 8
hrs.). Green PCs, however, are not network friendly.
That is, if the machine is asleep (in a low-powered
state), it cannot be addressed from the network, thus
hindering the network administrators from doing their
nightly tasks.
Working together, AMD and Hewlett Packard (HP)
came up with a solution to this problem. Since power is
generally on inside a green machine, the network side
of the machine could be left in a state, whereby it would
continue to scan every packet coming in from the net-
work, this time looking for the special data sequence
that would serve to
wake up
the sleeping machine. The
value that separates one machine from another on an
Ethernet network is its unique IEEE address. This
unique address repeated 16 times in a row anywhere
within a valid network frame鈥檚 data 鏗乪ld was chosen to
serve as the wake-up call. This frame has now been
called a
Magic Packet
frame.
In the interest of making Magic Packet technology an
industry standard, AMD is licensing this technology to
network vendors at minimal cost, royalty free, so that all
vendors can enjoy its bene鏗乼s. Although Magic Packet
technology is not limited to any par ticular type
of Ethernet connection, the only connection
that makes sense from a low-power standpoint is a
10BASE-T connection.
The green computer hardware implementation and the
software interface now stand in opposition to the 鏗乶al
solution. This application note is meant to pull the solu-
tion together in a concise format providing a way for PC
vendors and embedded system users to implement
AMD鈥檚 Magic Packet technology. Divided into two sec-
tions, this application note addresses (1) the hardware
interface for three different hardware models and (2)
how the DOS-level Magic Packet software driver inter-
faces both with the operating system and the hardware
to bring a complete solution to the marketplace.
Currently, AMD has designed
Magic Packet
technology
into two of its network controllers, the PCnet鈩?ISA II
(79C961A) and the PCnet鈩?PCI II (79C970A). Both of
these controllers are available and in production today.
For further information, refer to the following AMD data
sheets:
Am79C961A Data Sheet (PID 19364)
and
Am79C970A Data Sheet (PID 19436).
HARDWARE
In the competitive PC environment,
green
has become
the byword for the next new standard system feature.
The original targets by the Department of Energy
(DOE) in its green recommendations were 30 watts (W)
for the system box and 30 W for the monitor in a low
power state. Since these values were relatively easy to
obtain in current technology, the market shifted to ask-
ing the question, 鈥渉ow deep a shade of green is your
system?鈥?There now stands at least three different so-
lutions to obtaining green status in the market. The fol-
lowing solutions are ordered from most power used to
least power used:
This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.
Publication#
20381
Rev:
A
Amendment/0
Issue Date:
March 1996

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