KT133 System Board 1
Chapter 1 Introduction
1-1Main Board Overview
The KT133(VT8363) and VT82C686A (K7VAT+ with VT82C686B) chipset is a high
performance, cost-effective and energy efficient system controller for the implementation
of AGP / PCI / ISA desktop personal computer systems based on 64-bit Socket-A (AMD
K7) processors.
The VT8363 supports DRAMs up to 1.5 GB. The DRAM controller supports standard
Synchronous DRAM(SDRAM) and Virtual Channel SDRAM (VC SDRAM), in a flexible
mix/match manner. The Synchronous DRAM interface allows zero wait state bursting
between the DRAM and the data buffers at 66/100/133 MHz. The six banks of DRAM can
be composed of an arbitrary mixture of 1M/2M/4M/8M/16M/32MxN DRAMs.
The VT8363 system controller also supports full AGP v2.0 capability for maximum bus
utilization including 1x, 2x and 4x mode transfers, SBA (SideBand Addressing),
Flush/Fence commands, and pipelined grants. Both Windows-95 VXD and
Windows-98/Windows 2000 miniport drivers are supported for interoperability with major
AGP-based 3D and DVD-capable multimedia accelerators. It also supports two 32-bit
3.3/5V system buses (one AGP and one PCI) that are synchronous/pseudo-synchronous to
the CPU bus.
The VT82C686A (K7VAT+ with VT82C686B) also includes an integrated keyboard
controller with PS2 mouse support, integrated DS12885 style real time clock with extended
256 byte CMOS RAM, integrated master mode enhanced IDE controller with full
scatter/gather capability and extension to UltraDMA-33/66/100 for 33/66/100 MB/sec
transfer rate, (K7VAT+ with VT82C686B can support Ultra DMA/100) integrated USB
interface with root hub and four function ports with built-in physical layer transceivers,
Distributed DMA support, and OnNow/ACPI compliant advanced configuration and power
management interface. It also includes an AC97/MC97 link for interface to external audio
and modem codecs, and all “Super-I/O” functions(serial ports, parallel port, and floppy
drive interface and game port).