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Introduction
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1.4.3.2
Intel
PC 133
The PC133 initiative provides the memory bandwidth necessary to obtain high performance from
the processor and AGP graphics controller. The platform's SDRAM interface supports 100 MHz
and 133 MHz operation. The latter delivers 1.066 GB/s of theoretical memory bandwidth
compared with the 800 MB/s theoretical memory bandwidth of 100 MHz SDRAM systems.
1.4.3.3
Accelerated Hub Architecture Interface
As I/O speeds increase, the demand placed on the PCI bus by the I/O bridge becomes significant.
With the addition of AC '97 and Ultra ATA/100, coupled with the existing USB, I/O requirements
could impact PCI bus performance. The 815EG platform's accelerated hub architecture ensures
that the I/O subsystem, both PCI and the integrated I/O features (IDE, AC '97, USB, LAN),
receives adequate bandwidth. By placing the I/O bridge on the accelerated hub architecture
interface instead of PCI, I/O functions integrated into the ICH2 and the PCI peripherals are
ensured the bandwidth necessary for peak performance.
1.4.3.4
Internet Streaming SIMD Extensions
The Pentium III processors provide 70 new SIMD (single instruction, multiple data) instructions.
The new extensions are floating-point SIMD extensions. Intel
integer SIMD instructions. The Internet Streaming SIMD extensions complement the MMX
technology SIMD instructions and provide a performance boost to floating-point-intensive 3D
applications.
1.4.3.5
Integrated LAN Controller
The 815EG chipset platform incorporates an ICH2 integrated LAN Controller. Its bus master
capabilities enable the component to process high-level commands and perform multiple
operations; this lowers processor utilization by off-loading communication tasks from the
processor.
The ICH2 functions with several options of LAN connect components to target the desired market
segment. The 82562EH provides a HomePNA 1 Mbit/sec connection. The 82562ET provides a
basic Ethernet 10/100 connection. The 82562EM provides an Ethernet 10/100 connection with the
added flexibility of Alert on LAN. More advanced LAN solutions can be implemented with the
82550 or other PCI based product offerings.
1.4.3.6
Ultra ATA/100 Support
The 815EG chipset platform incorporates an IDE controller with two sets of interface signals
(primary and secondary) that can be independently enabled, tri-stated or driven low. The
component supports Ultra ATA/100, Ultra ATA/66, Ultra ATA/33, and multiword PIO modes for
transfers up to 100 MB/sec.
1.4.3.7
Expanded USB Support
The 815EG chipset platform contains two USB Host Controllers. Each Host Controller includes a
root hub with two separate USB ports each, for a total of 4 USB ports. The addition of a second
USB Host Controller expands the functionality of the platform.
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MMX™ technology provides
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Intel
815EG Chipset Platform Design Guide
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