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ALiMAGIK 1 AMD Athlon Super Northbridge
Product Brief
Last updated: 7/30/00

The following are quoted excerpts from a Product Brief provided by ALi. Larry

M1647 is ALi’ s new generation of PCI Northbridge chip supporting the latest Socket A AMD Athlon TM Processors.  It Interfaces with the 66/100/133 double data rate S2K front side bus (FSB).  It is a single chip solution which provides high performance memory interface for both 66/100/133 SDR and 200/266 DDR. The feasible PC 266-DDR enables 2.1 GB/s peak bandwidth between the system memory and Northbridge to boost system performance to the next level. With AGP 1x/2x/4x supports, M1647 prepares system designers with enough head room to interface with different graphics solutions to fulfill various market requirements. ALi also manufactures a series of feature-rich, highly integrated Southbridge devices (M1543C, M1535D/M1535, M1535D+/M1535+) which seamlessly work with M1647 as a complete, flexible and cost-effective solution for Desktop and Notebook designers. M1647 also incorporate ALi’ s proven power management support which is particularly crucial to mobile applications.

Processor Support

  • Supports the Athlon TM family processor. Host bus frequency can be either 100MHz, 133MHz double data rate
  • 64-bit data bus and 32-bit addressing
  • Optimum buffering architecture design for CPU to memory, AGP and PCI read/write
  • Support both S2K bus open-drain and push-pull mode
  • Support notebook features, including FID change special cycle
  • Support 8 outstanding processor commands
  • Support 8 outstanding system probe commands
  • Flexible configured to support back to back read transfer in 1QW or 2QW
  • Support back to back write transfer
  • Optimized processor command scheduling and reordering
  • Support synchronous / asynchronous clock mode between processor and memory interface with optimized latency

Memory Support

  • Supports SDR w/ 66, 100, 133MHz / DDR 200, 266MHz
  • Supports symmetrical and asymmetrical SDRAM / DDR addressing
  • Supports 4, 16, 64, 128, 256, 512Mbit SDRAM / DDR
  • Maximum memory size : 3GB
  • Support 6 memory rows with per byte access on each row
  • Supports memory shadowing
  • x-1-1-1-1-1-1-1 back-to-back page hit
  • CAS before RAS and self refresh for SDRAM
  • Pipelined SDRAM / DDR cycle control with hidden pre-charge
  • Dynamic switching CKE algorithm
  • Supports LVTTL / SSTL2 signal level

Accelerated Graphics Port (AGP) Interface

  • Supports AGP specification V2.0
  • Supports up to 128 entries table look aside buffer for Graphic Address Remapping Table (GART)
  • AGP 66MHz protocol
  • AGP 1X / 2X / 4X sideband function
  • 28 entries Request queue
  • 64 QWORDs Read buffer
  • 32 QWORDs Write buffer

PCI Bus Support

  • Supports synchronous / asynchronous clock mode between the processor bus and the PCI bus
  • 32-bit Address / Data PCI bus using PCI bus driver technology
  • Supports up to 6 PCI masters excluding the M1647 and PCI-to-ISA bridge
  • Parity protection on all PCI bus signals
  • Fully supports PCI Configuration Space Enable (CSE) protocol
  • Fully compliant with PCI Rev. 2.2
  • Supports delayed transaction
  • Dynamic memory prefetch algorithm and programmable post write
    flush algorithm
  • Data Collection/Write assembly of line bursts
  • Supports concurrent PCI bus burst transfer at zero wait-states
  • 133 MB/sec data streaming for PCI bus to SDRAM / DDR access with minimum latency

Power Management

  • Supports ACPI 1.0b and Legacy green
  • Support PCI Mobile CLKRUN#
  • Support AGP Mobile BUSY# / STOP#
  • Internally dynamic clock stop


  • 528 balls 35x35mm BGA package

7/30/00  ALi originally (7/26/00) sent me this VIA E-Mail.  It was not available on their site then.  They now have info on the Northbridge and Southbridge chips in the ALiMAGIK 1 chipset posted on their site.  I am trying to get still more info to add to this page/article on the chipset.Please see our Contact page if you have any comments or corrections that would make this article better. Please use our Forums if you need help with a computer or network problem.

Copyright, Disclaimer, and Trademark Information Copyright © 1996-2006 Larry F. Byard.  All rights reserved. This material or parts thereof may not be copied, published, put on the Internet, rewritten, or redistributed without explicit, written permission from the author.