317697-001 查看數據表（PDF） - Intel

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317697-001

Gigabit Ethernet Controller

Intel 

82575 Gigabit Ethernet Controller Datasheet

8.0

Crystal Requirements

Table 21. Reference Crystal Specification Requirements

Parameter Name

Frequency

Vibration mode

Cut

Operating /Calibration Mode

Frequency Tolerance @25°C

Temperature Tolerance

Operating Temperature

Non Operating Temperature Range

Equivalent Series Resistance (ESR)

Load Capacitance

Shunt Capacitance

Pullability from Nominal Load Capacitance

Max Drive Level

Insulation Resistance

Aging

Differential board capacitance*

Board Capacitance

External Capacitors

Board Resistance

Symbol

fo

Δf/fo @25°C

Δf/fo

Topr

Topr

Rs

Cload

Co

Δf/Cload

DL

IR

Δf/fo

CD

Cs

C1, C2

Rs

Recommended Value

25.000 [MHz]

Fundamental

AT

Parallel

±30 [ppm]

±30 [ppm]

-20 to +70 [°C]

-40 to +90 [°C]

50 [Ù] maximum

20 [pF] (max 24pF)

6 [pF] maximum

15 [ppm/pF] maximum

0.5 [mW]

500 [MΩ] minimum

±5 [ppm/year[

2 [pF]

4 [pF]

27 [pF]

0.1 [Ω]

Conditions

@25 [°C]

@25 [°C]

@25 [MHz]

@ 100V DC

9.0

LED Configuration

The 82575provides 4 LEDs per port that may be used to indicate the status of the

traffic. The default setup of the LEDs is done via the EEPROM words 1Ch and 1Fh. The

default setup for both ports is the same. This setup is reflected in the LEDCTL register

of each port. Each driver may change its setup individually. For each of the LEDs the

following parameters can be defined:

1. Mode: Defines which information is reflected by this LED. The encoding is described

in the LEDCTL register.

2. Polarity: Defines the polarity of the LED.

3. Blink mode: should the LED blink or be stable.

In addition, the blink rate of all LEDs can be defined. The possible rates are 200 ms or

83 ms for each phase. There is one rate for all LEDs

56

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