WG82574IT S LBAC Intel, WG82574IT S LBAC Datasheet - Page 445

• Manufacturer Part Number: WG82574IT S LBAC
• Description: CONTROLLER, ENET, INTEL 82574IT, 64PQFN
• Manufacturer: Intel

Specifications of WG82574IT S LBAC

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 64
• Package / Case: QFN
• Interface Type: I2C, JTAG, PCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Design Considerations—82574 GbE Controller
13.5.4
Note:
Figure 72.
Designing the 82574 as a 10/100 Mb/s Only Device
To connect the 82574 as a 10/100 Mb/s only device:
If you must use 10/100 magnetics in your design with the 82574, the magnetics must
have a Common Mode Choke (CMC) in the receive path.
The 82574L supports auto-MDIX; this feature CANNOT be disabled. If there is no CMC
in the receive path, the system most likely will not pass regulatory radiated emission
tests when MDI-X mode is used.
82574L Gigabit Magnetics Module Connections
1. Set bit 14 of the LED 1 Configuration Defaults/PHY Configuration (Word 0x1C) to
2. Connect MDI pair 0 (pins 57 and 58) and MDI pair 1 (pins 54 and 55) to your
3. Use one of the approved discrete gigabit magnetics that were tested with the
1b. Setting bit 14 to 1b disables 1000 Mb/s operation in all power modes (see
section
magnetics. MDI pair 2 (pins 52 and 53) and MDI pair 3 (pins 49 and 50) can each
be pulled up to 1.9 V dc through a 50  resistor or connected to the magnetics as a
gigabit device if it is desired at a later time to enable gigabit by altering bit 14 of
the LED 1 Configuration Defaults/PHY Configuration; word 0x1C (Giga Disable).
See
82574 (refer to
magnetics with the 82574.
G ig a b it M a g n e tic s
Figure 72
M o d u le
6.1.1.18).
and
section
Figure 73
13.5.3). Note that Intel has not tested any 10/100
for details.
M D I_P LU S (0 )
M D I_P LU S (1 )
M D I_P LU S (2 )
M D I_P LU S (3 )
M D I_ M IN U S (0 )
M D I_ M IN U S (1 )
M D I_ M IN U S (2 )
M D I_ M IN U S (3 )
5 8
5 7
5 5
5 4
5 3
5 2
5 0
4 9
8 2 5 7 4
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