82575 Ethernet Controller Design Guide

5.0Crystal Selection Parameters

All crystals used with Intel Ethernet controllers are described as “AT-cut,” which refers to the angle at which the unit is sliced with respect to the long axis of the quartz stone. Table 4 lists crystals which have been used successfully in other designs (however, no particular product is recommended):

Table 7. Crystal Manufacturers and Part Numbers

Manufacturer

Part No.

 

 

RALTRON

AS-25.000-20-F-SMD-T

 

 

CITIZEN AMERICA CORP

HCM4925.000MBBKTR

 

 

NDK AMERICA INC

41CD25.0S11005020

 

 

TXC CORPORATION - USA

6C25000131

 

 

For information about crystal selection parameters, see the chart in the 82575 Ethernet Controller Advance Information Datasheet. Contact your Intel representative to obtain this document.

5.1Vibrational Mode

Crystals in the above-referenced frequency range are available in both fundamental and third overtone. Unless there is a special need for third overtone, use fundamental mode crystals.

At any given operating frequency, third overtone crystals are thicker and more rugged than fundamental mode crystals. Third overtone crystals are more suitable for use in military or harsh industrial environments. Third overtone crystals require a trap circuit (extra capacitor and inductor) in the load circuitry to suppress fundamental mode oscillation as the circuit powers up. Selecting values for these components is beyond the scope of this document.

5.2Nominal Frequency

Intel Ethernet controllers use a crystal frequency of 25.000 MHz. The 25 MHz input is used to generate a 125 MHz transmit clock for 100BASE-TX and 1000BASE-TX operation – 10 MHz and 20 MHz transmit clocks, for 10BASE-T operation.

5.3Frequency Tolerance

The frequency tolerance for an Ethernet Platform LAN Connect is dictated by the IEEE

802.3 specification as ±50 parts per million (ppm). This measurement is referenced to a standard temperature of 25° C. Intel recommends a frequency tolerance of ±30 ppm.

5.4Temperature Stability and Environmental Requirements

Temperature stability is a standard measure of how the oscillation frequency varies over the full operational temperature range (and beyond). Several optional temperature ranges are currently available, including -40° C to +85° C for industrial environments. Some vendors separate operating temperatures from temperature stability. Manufacturers may also list temperature stability as 50 ppm in their data sheets.

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Intel 317698-001 manual Crystal Selection Parameters, Vibrational Mode, Nominal Frequency, Frequency Tolerance
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317698-001 specifications

The Intel 317698-001 is a prominent and highly regarded component in the realm of computer hardware. This product is part of Intel's extensive portfolio, designed primarily for enhancing computing performance, efficiency, and reliability. It is typically associated with server motherboards and is known for its robust architecture, making it ideal for enterprise-level applications.

One of the standout features of the Intel 317698-001 is its compatibility with multiple Intel processors, which provides flexibility for users looking to upgrade or configure their systems. This compatibility ensures that enterprises can choose from a range of processors according to their specific workload requirements, allowing for tailored performance enhancements.

The product is built on the foundation of advanced technologies, such as Intel's Turbo Boost and Hyper-Threading. Turbo Boost allows the processor to operate at higher frequencies than its base clock speed when demand increases, providing a significant performance boost when needed. Hyper-Threading enables multiple threads to run simultaneously on each core, which can lead to improved multitasking capabilities and more efficient resource utilization.

Memory bandwidth is another vital characteristic of the Intel 317698-001. This component supports high-speed DDR4 memory, offering increased bandwidth that is crucial for data-intensive applications. The architecture is designed to work seamlessly with ECC (Error-Correcting Code) memory, enhancing system reliability by detecting and correcting internal data corruption.

In terms of connectivity, the Intel 317698-001 features multiple PCIe lanes, supporting various expansion cards for enhanced functionality. This includes the integration of NVMe drives for faster storage solutions, which is essential for modern applications that demand quick data access and retrieval.

Security is also a priority with the Intel 317698-001, which incorporates hardware-based security features to protect data integrity and prevent unauthorized access. These features include Intel Trusted Execution Technology, which creates a secure environment for executing sensitive code.

Overall, the Intel 317698-001 stands out with its combination of performance, versatility, and security. It is an ideal choice for businesses looking to enhance their computing capabilities while ensuring system reliability and security in an increasingly data-driven world. With its robust technological foundation, it continues to play a critical role in modern computing environments.
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