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Magic Packet Technology
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Short Description: This white paper presents a description of the Magic Packet Technology and how it works. It also ... The basic technical details of Magic Packet Technology ...
Content Inside: Magic Packet Technology White Paper ABSTRACT This white paper presents a description of the Magic Packet Technology and how it works. It also covers some issues involving the sleeping Green PC and how the Magic Packet Technology can be used to put a PC in a low-power state and still be manageable by a network system administrator. SCOPE Below are details on the silicon implementation of Magic Packet Technology, as well as some of the sys- The PC market has many forces influencing the design tem and software implications. and implementation of PCs, operating systems, and peripheral devices. Most of the time, these forces are Magic Packet Technology Overview complementary, such as CPU performance and multi- The basic technical details of Magic Packet Technology media uses, or the desire for end users to have their are simple and easy to understand. There is also a sec- machines backed up each night, and the Information ond set of details, which will be implementation spe- Systems (IS) department's desire to maintain data in- c i fic . I n o t h e r w o r d s , s i l i c o n - o r g a t e - l e v e l tegrity throughout the network. implementations of Magic Packet Technology may dif- However, sometimes the forces working on the PC fer from AMD's approach and be completely interoper- market seem to be in direct conflict. One such example able, as long as the basic feature set is maintained. is the desire of the IS department to be able to do end Magic Packet Technology is a feature designed to be node management (software updates, backups, etc.) incorporated into an Ethernet controller. The basic fea- and the US Government's desire, through the Energy ture set consists of the following: Star Program, to put PCs to sleep soon after the PC is not in use. If the PC falls asleep at 5:30 in the evening, s Magic Packet Mode Enable how will the IS department manage it? If the user feels s Magic Packet Frame Detection it is more important to have his hard disk backed up s than save power, will he disable the power savings fea- Magic Packet Mode Disable ture of his PC? If so, this action will nullify the Energy Magic Packet Mode Enable Star Program's intent to save power by PCs putting Assuming the Ethernet controller is running and commu- themselves to sleep when not in use. nicating with the network, there must be a way for the PROPOSAL PC's power management hardware or software to put the Ethernet controller into the Magic Packet mode prior AMD and Hewlett Packard identified this problem al- to the system going to sleep. On both the PCnet-ISA II most 2 years ago and began working to find a solution and PCnet-PCI II devices, this can be accomplished two to the problem of the networked Green PC (Green ways: either by setting a bit in an internal register or by being the industry term for a PC that goes into low- driving the SLEEP# pin low. Either one of these actions power mode upon sensing no activity). This collabora- will disable normal network activity and enable Magic tion resulted in a proposal for an industry standard Packet mode. The device will no longer generate any mechanism that allows a networked PC to go com- transmits and will monitor all incoming frames to deter- pletely asleep (Deep Green), yet still allows the net- mine if any of them is a Magic Packet frame. wo r k a d m i n i s t r a t o r o r s o m e k i n d o f n e t w o r k management software to wake up the PC simply by Magic Packet Frame Detection sending it a specific Ethernet frame. This standard Once the LAN controller has been put into the Magic Ethernet frame contains a specific data pattern de- Packet mode, it scans all incoming frames addressed tected by the Ethernet controller on the receiving end. to the node for a specific data sequence, which indi- The Ethernet controller then alerts the system and the cates to the controller that this is a Magic Packet frame. power management circuitry wakes it up. A Magic Packet frame must also meet the basic re- quirements for the LAN technology chosen, such as This document contains information on a product under development at Advanced Micro Devices. The information Publication# 20213 Rev: A Amendment/0 is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed Issue Date: November 1995 product without notice. Document OutlineMAGIC PACKET TECHNOLOGYABSTRACTSCOPEPROPOSALSILICON IMPLEMENTATIONSYSTEM IMPLEMENTATIONCONCLUSION
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