Introduction - Intel 520J - Pentium 4 2.80GHz 800MHz 1MB Socket 775 CPU Datasheet

Introduction

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Introduction
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The Intel Pentium 4 processor on 90 nm process in the 775-land package is a follow on to the
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Pentium 4 processor in the 478-pin package with enhancements to the Intel NetBurst
microarchitecture. The Pentium 4 processor on 90 nm process in the 775-land package uses Flip-
Chip Land Grid Array (FC-LGA4) package technology, and plugs into a 775LGA socket. The
Pentium 4 processor in the 775-land package, like its predecessor, the Pentium 4 processor in the
478-pin package, is based on the same Intel 32-bit microarchitecture and maintains the tradition of
compatibility with IA-32 software.
Note: In this document the Pentium 4 processor on 90 nm process in the 775-land package is also referred
to as the processor.
The Pentium 4 processor on 90 nm process in the 775-land package supports Hyper-Threading
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Technology . Hyper-Threading Technology allows a single, physical processor to function as two
logical processors. While some execution resources (such as caches, execution units, and buses)
are shared, each logical processor has its own architecture state with its own set of general-purpose
registers, control registers to provide increased system responsiveness in multitasking
environments, and headroom for next generation multithreaded applications. Intel recommends
enabling Hyper-Threading Technology with Microsoft Windows* XP Professional or
Windows* XP Home, and disabling Hyper-Threading Technology via the BIOS for all previous
versions of Windows operating systems. For more information on Hyper-Threading Technology,
see http://www.intel.com/info/hyperthreading. Refer to Section 6.1, for Hyper-Threading
Technology configuration details.
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The Intel Pentium 4 processor 571, 561, 541, 531, and 521 support Intel Extended Memory 64
Technology (EM64T) Φ as an enhancement to Intel's IA-32 architecture. This enhancement enables
the processor to execute operating systems and applications written to take advantage of Intel
EM64T. With appropriate 64 bit supporting hardware and software, platforms based on an Intel
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processor supporting Intel EM64T can enable use of extended virtual and physical memory.
Further details on the 64-bit extension architecture and programming model is provided in the
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Intel Extended Memory 64 Technology Software Developer Guide at: http://developer.intel.com/
technology/64bitextensions/.
In addition to supporting all the existing Streaming SIMD Extensions 2 (SSE2), there are 13 new
instructions that further extend the capabilities of Intel processor technology. These new
instructions are called Streaming SIMD Extensions 3 (SSE3). These new instructions enhance the
performance of optimized applications for the digital home such as video, image processing, and
media compression technology. 3D graphics and other entertainment applications such as gaming
will have the opportunity to take advantage of these new instructions as platforms with the Pentium
4 processor in the 775-land package and SSE3 become available in the market place.
The processor's Intel NetBurst microarchitecture FSB uses a split-transaction, deferred reply
protocol like the Pentium 4 processor. The Intel NetBurst microarchitecture FSB uses Source-
Synchronous Transfer (SST) of address and data to improve performance by transferring data four
times per bus clock (4X data transfer rate, as in AGP 4X). Along with the 4X data bus, the address
bus can deliver addresses two times per bus clock and is referred to as a "double-clocked" or 2X
address bus. Working together, the 4X data bus and 2X address bus provide a data bus bandwidth
of up to 6.4 GB/s.
Datasheet 11