82583V Datasheet, PDF (334/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

82583V GbE Controller—Design Considerations
11.5.4
Note:
Designing the 82583V as a 10/100 Mb/s Only Device
To connect the 82583V as a 10/100 Mb/s only device:
1. Set bit 14 of the LED 1 Configuration Defaults/PHY Configuration (Word 0x1C) to
1b. Setting bit 14 to 1b disables 1000 Mb/s operation in all power modes (see
section 6.1.1.18).
2. Connect MDI pair 0 (pins 57 and 58) and MDI pair 1 (pins 54 and 55) to your
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 Ω 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 Figure 53 and Figure 54 for details.
3. Use one of the approved discrete gigabit magnetics that were tested with the
82583V (refer to section 11.5.3). Note that Intel has not tested any 10/100
magnetics with the 82583V.
If you must use 10/100 magnetics in your design with the 82583V, the magnetics must
have a Common Mode Choke (CMC) in the receive path.
The 82583V 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.
M DI_PLUS (0)
58
M DI_M INUS (0)
57
M DI_PLUS (1)
55
M DI_M INUS (1)
54
G igabit M agnetics
M odule
M DI_PLUS (2)
53
M DI_M INUS (2)
52
M DI_PLUS (3)
50
M DI_M INUS (3)
49
Figure 53. 82583V Gigabit Magnetics Module Connections
82583V
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