WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 430

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

13.5.4
Note:
Figure 66.
430
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 82574 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.
82574 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 66
M o d u le
6.2.1.20).
and
section
Figure 67
13.5.3). Note that Intel has not tested any 10/100
for details.
M D I_ P L U S (0 )
M D I_ P L U S (1 )
M D I_ P L U S (2 )
M D I_ P L U 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)
82574 GbE Controller—Design Considerations
58
57
55
54
53
52
50
49
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