EP80579 Datasheet, PDF (253/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
8.0
8.1
8.2
8.2.1
8.2.2
IA-32 Core
Overview
The EP80579system-on-a-chip (SoC) uses an IA-32 core, which is based on the Intel^®
Pentium^® M processor (90 nm). Major features include:
• 600 MHz, 1066 MHz and 1200 MHz operating frequencies
• FSB frequency of 400 MHz and 533 MHz.
• Uni-directional FSB interface (on-chip) for SoC applications
• 32 KByte L1 split instruction and data caches
• 256 KByte 2-way L2 cache with 64B lines
• Soft error protection on L2 cache data and tags (via ECC), soft error protection on
L1 cache data and tags (via parity)
• New CPU identifier (CPUID)
Note the differences between the IA-32 core and the Intel® Pentium^® M processor (90
nm) are:
• Core and FSB operating frequencies
• Uni-directional FSB instead of bi-directional
• Different CPU identifier (CPUID)
• Reduced L2 cache size and ways
• De-featured Intel SpeedStep^® Technology (no VRM specification required)
Theory of Operation
This section discusses several operational areas of IA-32 core.
L2 Cache Size
The IA-32 core reduces the size and associativity of the L2 cache on the Pentium M
processor (90 nm)from 2MB 8-way to 256KB 2-way.
Platform and JTAG Identifiers
The Platform ID is a project-specific value. It is used solely for selecting a microcode
update (i.e., patch) and is tightly-coupled to a specific CPUID number. BIOS and OS
software are aware of the Platform ID convention and automatically pick up the
appropriate patch. There are two views to the Platform ID: the MSR view and the Patch
view: The MSR view is a 3-bit value read out of the processor’s FUSE_MSR[52:50]. This
value is determined by three fuses and is unique per CPUID SKU. The Patch view is the
binary value which represents two raised to the power of the MSR view value. A
microcode update is considered applicable to a specific processor if, and only if, the
following condition is true:
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
253