key features

Host Interface Controller

Supports Intel Slot 1/Socket370 Pentium!!!T/Pentium!!!/Celeron CPUs

Asynchronous Host/DRAM Clock Scheme at the combination of 133/133, 133/200, 133/266, 100/133, 100/200, 100/266

Integrated DRAM Controller

3 unbuffered DIMM of 3.3V SDRAM or 2.5V DDR DRAM

Supports DDR Memory Bus up to 266 MHz / SDRAM Memory Bus up to 133 MHz

System Memory Size up to 1.5GB

Up to 512MB per DIMM

Supports 16Mb, 64Mb, 128Mb, 256Mb, 512Mb SDRAM Technology

Integrated A.G.P. Compliant Target/66Mhz Host-to-PCI Bridge

AGP v2.0 Compliant

Supports Graphic Window Size from 4MBytes to 256MBytes

Supports Pipelined Process in CPU-to- A.G.P. Access

Supports Additional AGP slot with 4X and Fast Write Transaction

Meet PC2001 Requirements

Build-in Multi-threaded IO Link Delivering 1.2GB/sec

Concurrently Serve (Embedded) DMA Devices including Dual IDE channels, Dual USB channels, MAC Controller, and S/W Audio/Modem DMA channels

Support those Embedded DMA Devices with Pipelined Streaming PCI 2.2 Specification Compliant

High Performance PCI Arbiter

Supports up to 6 PCI Masters

Fast IDE Master/Slave Controller

Supports Build-in Multithreaded IO Link Mastering

PIO Mode 0, 1, 2 , 3, 4

Multiword DMA Mode 0, 1, 2

Ultra DMA 33/66/100

Two Independent IDE Channels Each with 16 DW FIFO

Advanced Power Management

Meets ACPI 1.0b Requirements

Meets APM 1.2 Requirements

ACPI Sleep States Include S1, S3, S4, S5

System Power-Up Events Include: Power Button, Keyboard Password/ Hot-Key, RTC Alarm, Modem Ring-In, GPIO0, LAN, PME#, AC'97 Wake-Up and USB Wake-Up

Integrated Keyboard Controller

Integrated Real Time Clock (RTC) with 256B CMOS SRAM

Universal Serial Bus Host Controller

Supports Build-in Multithreaded IO Link Mastering

OpenHCI Host Controller with Root Hub

Two USB Host Controllers

Six USB Ports

Integrated IEEE 802.3 & 802.3U Complied MAC with MII Interface and MAC Interface

IEEE 802.3 and 802.3u Standard Compatible

Single 25MHz Clock for 10 and 100 Mbps Operation

Supports Software, Enhanced Software, and Automatic Polling Schemes to Internal PHY Status Monitor and Interrupt

Supports 10base-T, 100base-Tx, 1 Mb/s & 10 Mb/s Home networking

Integrated Audio Controller with AC97 Interface.

Supports AC97 v2.1 Audio Codec and Modem Codec

NAND Tree for Ball Connectivity Testing

677-Balls BGA Package

1.8V Core with Mixed 1.5V, 2.5V and 3.3V I/O CMOS Technology

SiS635T overview

The single chipset, SiS635T, provides a high performance/low cost Desktop solution for the Intel Slot 1 and socket 370 series CPUs, Celeron, P!!!, and P!!!T, based system by integrating a high performance North bridge, a Super-South bridge and an AGP4X Slot. SiS635T supports 3-DIMM with Double Data Rate (DDR) SDRAM bandwidth up to 2.1 GB/s, or with traditional SDRAM bandwidth up to 1.06 GB/s and also supports an AGP Slot that supports 4X data transfers and Fast Write function.

The "Super-South Bridge" in SiS635T integrates rich peripheral controllers/accelerators /interfaces and is compliant to PC2001.SiS635T provides a total communication solution including 10/100Mb Fast Ethernet for Office requirement and 1Mb/10Mb HomePNA for Home Networking

SiS635T offers AC'97 compliant interface and also provides interface to Low Pin Count (LPC) operating at 33 MHz clock which is the same as PCI clock on the host, and dual USB host controllers with six USB ports that deliver better connectivity and 2 x 12Mb bandwidth. SiS635T supports up to 6 PCI masters. In addition to the PIC, the super-south bridge also incorporates I/O Advanced Programmable Interrupt controller.

The built-in fast IDE controller supports the ATA PIO/DMA, and the Ultra DMA33/66/100 function that supports the data transfer rate up to 100 MB/s. It provides the separate data path for two IDE channels that can eminently improve the performance under the multi-tasking environment.

SiS635T provides one solution to resolve the lack of IO bandwidth for the previous PC platform with PCI bus bandwidth only up to 133MB/s. SiS635T applies the multithreaded architecture - "Build-in Multi-threaded IO Link" to provide enough IO bandwidth up to 1.2GB/s and increase the hardware parallelism. It will increase efficiently the system total throughput and performance, especially for multi-tasking environment.