Chip sets SiS for Pentium II/III

Now the sets of system logic giving support to modern processors and providing necessary conditions for implementation of their big potential possibilities, are presented by the products released in main corporations of Intel, VIA, ALi and SiS. Thus, despite rather small share of the market occupied with chip sets SiS, they thanks to the characteristics deserve the most steadfast attention.

SiS corporation (Silicon Integrated System Corporation) has rich history of development and release of specialised chipsets for the motherboards providing effective operation of several generations of processors. Products of this corporation used the big popularity as provided rather high efficiency at good stability of the systems grounded on usage of these sets of the system logic. As examples of successful variants it is possible to name chip sets SiS471 and SiS496/85C497, intended for processors i486 and their clones.

However after after release of processors, on the market of accessories there was a corporation of Intel with the high-powered chip sets, SiS corporation share began to decrease promptly. Besides, the part of this market was captured by such contestant firms, as ALi and VIA which quality of products also was very high. Thus functionality of some products often not only did not concede to the best samples of SiS corporation, but sometimes and exceeded them.

Nevertheless, despite all difficulties, SiS corporation continues to release chip sets, many of which have found a wide circulation thanks to rather quite good parametres, a stable operation and rather low prices received thanks to a high-scale of integration, perspective architectures and application of current technologies.

Recently the corporation has concentrated the efforts to development of the integrated solutions that allows to reduce cost of computer systems at the expense of abbreviation of a set of accessories. And if the systems using products of SiS corporation, sometimes concede on productivity to some systems created on alternative units, they, as a rule, differ very low prices, that often does their attractive to implementators and users. Many corporations making motherboards, willingly use in the products chip sets SiS corporations characterised by a wide set of functionality. It is possible to be convinced of it on an example of the most widespread chip sets of this corporation oriented to systems with processors of type of Pentium II/III.

Chip set SiS600/SiS5595 — SiS600 Pentium II PCI/A.G.P. Chipset it is oriented to systems with processors of Pentium II. It is calculated for operation with frequency of the bus of the processor (Host Bus GTL +) to 100 MHz, supports frequency buses of 60/66/100 MHz. The chip set consists of chips of a high-scale of integration.

Integrated controllers AGP and PCI support: AGP Rev. 1.0, AGP 1X/2X 66/133 MHz 3,3 In, PCI Rev. 2.1; to 4 PCI Master, UltraDMA/33 etc .

Resources PCI-to-ISA Bridge support the keyboard, the mouse, 2 ports USB, ACPI Rev. 1.0 etc .

Chip set SiS600 Pentium II PCI/A.G.P. Chipset consists of two chips: SiS600 PCI/A.G.P./Host/Memory Controller in konstruktive 487 BGA and SiS5595 PCI SYSTEM I/O (PCI-to-ISA Bridge).

Chip set SiS620/SiS5595 — SiS620 Pentium II Integrated 3D Graphics Chipset is intended for desktop computers and notebooks in which structure processors of Pentium II/III with Slot 1 plugs and Socket 370 use   .

Integrated HOST/DRAM the controller supports the processor of Intel of Pentium II/III at frequencies of 66/100 MHz Front Side Bus; synchronous mode Host/DRAM about 100/100, 83/83, 75/75, 66/66 MHz; asynchronous mode Host/DRAM about 100/75, 100/66, 83/66, 66/83, 66/100 MHz.

Controller DRAM supports 3 DIMM, 6 banks 3,3 In SDRAM; a memory size to 1,5 Gbytes; to 256 Mb on bank, a chip of memory 16, 64, 128, 256 Mbit SDRAM etc .

Integrated controllers AGP and PCI support: AGP Rev. 1.0, AGP 1X/2X 66/133 MHz 3,3 In, PCI Rev. 2.1; PCI Bus Mastering; to 4 PCI Master; 2 independent channels IDE with 16 DW FIFO; UltraDMA/33/66, etc .

Super-AGP architecture provides transmission of textures 3D with a speed to 800 Mb per second; supports the double 64-bit data bus: 64 bits between GUI and system memory (to 100 MHz), 64 bits between GUI and Host (to 100 MHz).

Graphics 2D/3D the video accelerator supports mode UMA which is not demanding external display memory that provides considerable saving of resources; 2, 4, 8 Mb of the frame buffer localised in dynamic storage (UMA Mode); S/W MPEG-I and MPEG-II Video etc . The mode with usage of an external video memory (Non-UMA Mode) is possible.

In this mode the video memory which size can make is supported: 2, 4, 8 Mb SDRAM/SGRAM at maximum frequency of 100 MHz. As a part of the built in video resources uses programmed 24-bit True-Color RAMDAC with frequency of 230 MHz.

Modes of graphics system are possible at a lower case way (NI) image generations from 640 ґ 480@85Гц to 1600 ґ 1200@85Гц.

Resources PCI-to-ISA Bridge support the keyboard, the mouse, 2 ports USB, ACPI Rev. 1.0 etc .

Chip set SiS620 Pentium II Integrated 3D Graphics Chipset consists of two chips: SiS620 in konstruktive 576 BGA and SiS5595 PCI SYSTEM I/O (PCI-to-ISA Bridge).

All basic functions traditionally inherent to chip South Bridge, for example, support are included in chip set structure: the keyboard and the manipulator the mouse, 10/100 Mbit Fast Ethernet or 1Mb HomePNA for Home Networking, interface AC ’ 97 with program implementation of functions of audio and the modem. Support is besides, provided: UltraDMA/33 and UltraDMA/66, PCI 2.2, to 4 PCI Master, two independent channels IDE with 16 DW FIFO, 5 ports USB, the serial interface I ²C Bus/SMBus etc . Hardware support of playback of CD/DVD on TV is carried out. Thanks to hardware support AC ’ 97 (functions DSP, a wavetable synthesis etc .) high parametres for a sound, for example, a relation a signal/noise — more than 90 db, a full duplex, 64-golosaja polyphony, WaveTable etc. are reached   .

To pass to razrelu Motherboards and chip sets