VT8601 datasheet(9/144 Pages) ETC1

9 / 144 page

VT8601 Apollo ProMedia

Revision 1.3 September 8, 1999

-3-

Features

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• Advanced High-Performance DRAM Controller

− DRAM interface synchronous or pseudosynchronous with CPU FSB speed of 66 / 100 / 133 MHz

− DRAM interface may be faster than CPU by 33 MHz to allow use of PC100 with 66 MHz Celeron CPU or use of

PC133 with 100 MHz Pentium II or Pentium III CPU

− DRAM interface may be slower than CPU by 33 MHz to allow use of older memory modules with a newer CPU

− Concurrent CPU, AGP, and PCI access

− Supports FP, EDO, SDRAM and VCM-SDRAM memory types

− Different DRAM types may be used in mixed combinations

− Different DRAM timing for each bank

− Dynamic Clock Enable (CKE) control for SDRAM power reduction in high speed systems

− Mixed 1M / 2M / 4M / 8M / 16M / 32MxN DRAMs

− 6 banks DRAMs supported up to 1GB (256Mb DRAM technology)

− Flexible row and column addresses

− 64-bit data width only

− 3.3V DRAM interface with 5V-tolerant inputs

− Programmable I/O drive capability for MA, command, and MD signals

− Two-bank interleaving for 16Mbit SDRAM support

− Two-bank and four bank interleaving for 64Mbit SDRAM support

− Supports maximum 8-bank interleave (i.e., 8 pages open simultaneously); banks are allocated based on LRU

− Independent SDRAM control for each bank

− Seamless DRAM command scheduling for maximum DRAM bus utilization

(e.g., precharge other banks while accessing the current bank)

− Four cache lines (16 quadwords) of CPU to DRAM write buffers

− Four cache lines of CPU to DRAM read prefetch buffers

− Read around write capability for non-stalled CPU read

− Speculative DRAM read before snoop result

− Burst read and write operation

− x-2-2-2-2-2-2-2 back-to-back accesses for EDO DRAM from CPU or from DRAM controller

− x-1-1-1-1-1-1-1 back-to-back accesses for SDRAM

− BIOS shadow at 16KB increment

− Decoupled and burst DRAM refresh with staggered RAS timing

− CAS before RAS or self refresh

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