Intel ATOM PROCESSOR N 500 - UPDATE REVISION 001 User manual

Document Number: 324341-001
Intel® Atom™ Processor N500
Series
Specification Update
September 2010
Revision 001

2Specification Update
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Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the
absence or characteristics of any features or instructions marked “reserved” or “undefined.” Intel reserves these for future
definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The
information here is subject to change without notice. Do not finalize a design with this information.
Intel® Atom™ Processor N500 series may contain design defects or errors known as errata which may cause the product to
deviate from published specifications. Current characterized errata are available on request.
Intel processor numbers are not a measure of performance. Processor numbers differentiate features within each processor
family, not across different processor families. Over time processor numbers will increment based on changes in clock, speed,
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particular feature. Current roadmap processor number progression is not necessarily representative of future roadmaps.
See www.intel.com/products/processor_number for details.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
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Copyright © 2010, Intel Corporation. All rights reserved.

Specification Update 3
Contents
Preface ...............................................................................................................................5
Identification Information ......................................................................................................8
Summary Tables of Changes ................................................................................................10
Errata...............................................................................................................................14
Specification Changes .........................................................................................................31
Specification Clarifications ...................................................................................................32
Documentation Changes......................................................................................................33

4Specification Update
Revision History
Document
Number Revision Description Date
324341 001 •Initial Release September 2010
§

Preface
Specification Update 5
Preface
This document contains information specific to the Intel® Atom™ Processor N500
series. It is a Compilation of:
•Device sightings
•Document sightings
•Specification clarifications
•Specification changes
It is intended for hardware system manufacturers and software developers.
Information types defined in the Nomenclature section of this document are
consolidated into this document and are no longer published in other documents. This
Affected Documents
Document Title Document
Number/
Location1
Intel® Atom™ Processor N400 series and N500 series External Design
Specifications (EDS) – Volume 1 403526
Intel® Atom™ Processor N400 series and N500 series External Design
Specifications (EDS) – Volume 2 403528
RS – Pineview Processor BIOS Writer’s Guide (BWG), Volume 1 Contact your Intel
representative for
the latest revision.
RS – Pineview Processor BIOS Writer’s Guide (BWG), Volume 2 Contact your Intel
representative for
the latest revision.
NOTES:
1. Contact your Intel representative to receive the latest revisions of these documents.

Preface
6Specification Update
Related Documents
Document Title Document
Number/
Location1
Intel®64 and IA-32 Architectures Software Developer’s Manual
Documentation Changes 252046
Intel®64 and IA-32 Architectures Software Developer’s Manual, Volume
1: Basic Architecture 253665
Intel®64 and IA-32 Architectures Software Developer’s Manual, Volume
2A: Instruction Set Reference, A-M 253666
Intel®64 and IA-32 Architectures Software Developer’s Manual, Volume
2B: Instruction Set Reference, N-Z 253667
Intel®64 and IA-32 Architectures Software Developer’s Manual, Volume
3A: System Programming Guide 253668
Intel®64 and IA-32 Architectures Software Developer’s Manual, Volume
3B: System Programming Guide 253669
IA-32 Intel®Architectures Optimization Reference Manual 248966
Intel®Processor Identification and the CPUID Instruction Application Note
(AP-485) 241618
Intel®64 and IA-32 Architectures Application Note TLBs, Paging-Structure
Caches, and Their Invalidation 317080
Nomenclature
Errata are design defects or errors. These may cause the processor behavior to
deviate from published specifications. Hardware and software designed to be used
with any given stepping must assume that all errata documented for that stepping are
present on all devices.
S-Spec Number is a five-digit code used to identify products. Products are
differentiated by their unique characteristics, for example, core speed, L2 cache size,
package type, etc. as described in the processor identification information table. Read
all notes associated with each S-Spec number.
QDF Number is a four digit code used to distinguish between engineering samples.
These samples are used for qualification and early design validation. The functionality
of these parts can range from mechanical only to fully functional. This document has a
processor identification information table that lists these QDF numbers and the
corresponding product details.
Specification Changes are modifications to the current published specifications.
These changes will be incorporated in any new release of the specification.
Specification Clarifications describe a specification in greater detail or further
highlight a specification’s impact to a complex design situation. These clarifications
will be incorporated in any new release of the specification.

Preface
Specification Update 7
Documentation Changes include typos, errors, or omissions from the current
published specifications. These will be incorporated in any new release of the
specification.
Note: Errata remain in the specification update throughout the product’s lifecycle, or until a
particular stepping is no longer commercially available. Under these circumstances,
errata removed from the specification update are archived and available upon request.
Specification changes, specification clarifications and documentation changes are
removed from the specification update when the appropriate changes are made to the
appropriate product specification or user documentation (datasheets, manuals, etc.).
§

Identification Information
8Specification Update
Identification Information
Intel® Atom™ Processor N500 series processor on 45-nm process stepping can be
identified by the following register contents:
Table 1. Component Identification via Programming Interface
Reserved Extended
Family1Extended Model2Reserved Processor Type3Family Code4Model Number5Stepping ID6
31:28 27:20 19:16 15:13 12 11:8 7:4 3:0
0000000b 0001b 0b 0110b 1100b XXXXb
NOTES:
1. The Extended Family, bits [27:20] are used in conjunction with the Family Code,
specified in bits [11:8], to indicate whether the processor belongs to the Intel386®,
Intel486®, Pentium®, Pentium Pro, Pentium 4, Atom or Intel Core processor family.
2. The Extended Model, bits [19:16] in conjunction with the Model Number, specified in
bits [7:4], are used to identify the model of the processor within the processor’s family.
3. The Processor Type, specified in bits [13:12] indicates whether the processor is an
original OEM processor, an OverDrive processor, or a dual processor (capable of being
used in a dual processor system).
4. The Family Code corresponds to bits [11:8] of the EDX register after RESET, bits [11:8]
of the EAX register after the CPUID instruction is executed with a 1 in the EAX register,
and the generation field of the Device ID register accessible through Boundary Scan.
5. The Model Number corresponds to bits [7:4] of the EDX register after RESET, bits [7:4]
of the EAX register after the CPUID instruction is executed with a 1 in the EAX register,
and the model field of the Device ID register accessible through Boundary Scan.
6. The Stepping ID in bits [3:0] indicates the revision number of that model. See Table 2
for the processor stepping ID number in the CPUID information.
When EAX is initialized to a value of 1, the CPUID instruction returns the Extended
Family, Extended Model, Type, Family, Model and Stepping value in the EAX register.
Note that the EDX processor signature value after reset is equivalent to the processor
signature output value in the EAX register.

Identification Information
Specification Update 9
Component Marking Information
Intel® Atom™ Processor N500 series is identified by the following component
markings.
Figure 1. Intel® Atom™ Processor N500 Series (Micro-FCBGA8) Markings
SAMPLE MARK EXAMPLE:
GRP1LINE1 : INTEL{M}{C}’YY {e1}
GRP2LINE1 : {FPO} S-Spec Processor#
Table 2. Identification Table for Intel® Atom™ Processor N500 Series
QDF /
S-Spec MM# Product Stepping
Processor
# CPUID
Core Speed
Package Cache Size
(KB)
Highest
Freq. Mode
(HFM)
Lowest
Freq.
Mode (LFM)
Q4MF 908135 B0 N550 QS 000106CAh 1.50 GHz 1.00 GHz Micro-
FCBGA8 2 x 512
SLBXF 908140 B0 N550 Pro. 000106CAh 1.50 GHz 1.00 GHz Micro-
FCBGA8 2 x 512
§

Summary Tables of Changes
10 Specification Update
Summary Tables of Changes
The table included in this section indicated the sightings that apply to the Intel Atom
Processor N500 series. If a sighting becomes an Erratum, Intel may fix some of the
errata in a future stepping of the component, and account for the other outstanding
issues through documentation or specification changes as noted. This table uses the
following notations:
Codes Used in Summary Table
Stepping
X: This sighting applies to this stepping.
Blank (No mark): This sighting is fixed, or does not exist, in the listed stepping.
Status
Plan Fix: Root caused to a silicon issue and will be fixed in a future stepping.
Fixed: Root caused to a silicon issue and has been fixed in a subsequent stepping.
No Fix:Root caused to a silicon issue that will not be fixed.
Spec Change: Root caused to a specification error that will be updated.
Open, Under Investigation: A root cause has not been determined.
Not Reproducible: The sighting could not be reproduced after it was reported.
Third Party: Root caused to a board, software, driver, BIOS, or third party silicon
issue.
Row
Shaded: This item is either new or modified from the previous version of
the document.