參數(shù)資料
型號(hào)： 24707_PUB
英文描述： Programmable Resolution 1-Wire Digital Thermometer
中文描述： 時(shí)鐘發(fā)生器規(guī)格的AMD Athlon？ 64和AMD Opteron？處理器
文件頁(yè)數(shù)： 9/51頁(yè)
文件大小： 1783K
代理商： 24707_PUB
24707 Rev. 3.08 September 2003
Clock Generator Specification for AMD64 Processors
Chapter 1
Description
This specification is intended to provide a definition of the minimum set of requirements for the
first AMD64 processors system clock generators.
1.1
Specification Overview
The goal of this specification is
to provide enough information to enable development of clock generators for the
AMD64 processors
to provide the definition of a minimum feature set for a clock generator that enables initial
platform shipments
to allow clock generator vendors the flexibility to provide product differentiation above and
beyond this minimum feature set
to provide backward compatibility with AMD Athlon processor-based platforms
1.2
Pin-Strapped Configuration
Upon power up, the device samples the input states of various configuration input pins to define
the correct operating state without the need for software configuration through the I
2
C interface.
The I
2
C interface to internal configuration registers provides a method to optimize the operating
state of the clock generator.
Note
: Changes made through the I
2
C interface will override the hardware pin strapped
configuration.
1.3
Processor Frequency Selection and Spread Spectrum
Clocking
Processor frequency selection of 100, 133, 166, and 200 MHz are defined from hardware-sampled
inputs. Additional frequencies and operating states (combinations of processor frequency and
spread spectrum clocking features) can be selected through the I
2
C programmable interface. The
specified features in this specification provide a minimum set for AMD64 processor-based
platforms. Additional features may be provided at the discretion of the clock generator
manufacturer.
Spread spectrum modulation (down-spread only) is required for all outputs derived from the
internal processor PLL as shown in Figure 1 on page 7. This includes the processor, PCI33 and
PCI33_HT66 outputs. The REF, USB, and 24_48 MHz clocks are not affected by spread
spectrum control. The spread spectrum requirements include the ability to enable and disable
0.5% down spread clocking. A 0.5% down spread, 33-kHz triangular modulation is required and
Chapter 1
Description
5
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