SMSC EVB8700, Руководство пользователя, Страница: 4 / 10

LAN8700 Evaluation Board User Manual
Revision 1.0 (02-23-10)
USER MANUAL
SMSC LAN8700
4
2.2.1 PHY Address and LED Configuration
The LAN8700 allows the user to configure the default PHY address at power-up via the PHYAD[4:0]
configuration straps. Because these straps share functionality with device LEDs, care must be taken
to properly configure these signals.
Table 2.1 details the proper configuration required for each PHY
address value. By default, all EVB8700 PHY address straps are configured to a value of “1”.
Note: The PHYAD1 and PHYAD2 LEDs may function active-high or active-low depending on the
boards PHY address configuration. Refer to
Table 2.1 and the LAN8700 Datasheet for
additional information.
LED reference designators and definitions are detailed in Table 2.2 .
Table 2.1 PHY Address Configuration Settings
“0” “1” (DEFAULT)
PHYAD4
(MSB)
R11 populated R11 unpopulated
PHYAD3
R46 unpopulated
R48 populated
R36 populated
LED2 anode connected to FDUPLEX pin (flipped)
R46 populated
R48 unpopulated
R36 unpopulated
LED2 cathode connected to FDUPLEX pin
PHYAD2
R2 populated in position 2-3
R1 populated in position 2-3
R35 populated
Note: RJ45 Yellow LED will be active-high
R2 populated in position 1-2
R1 populated in position 1-2
R35 unpopulated
Note: RJ45 Yellow LED will be active-low
PHYAD1
R3 populated in position 2-3
R4 populated in position 2-3
R34 populated
Note: RJ45 Green LED will be active-high
R3 populated in position 1-2
R4 populated in position 1-2
R34 unpopulated
Note: RJ45 Green LED will be active-low
PHYAD0
(LSB)
R45 unpopulated
R47 populated
R33 populated
LED1 anode connected to SPEED100 pin (flipped)
R45 populated
R47 unpopulated
R33 unpopulated
LED1 cathode connected to SPEED100 pin
Table 2.2 LEDs
REFERENCE COLOR INDICATION
J1
Green Ethernet Link
Yellow Ethernet Activity
LED1 Green Ethernet Speed
LED2 Green Ethernet Full-Duplex