Microchip Technology EVB8740, Руководство пользователя

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EVB8740/EVB8741 Evaluation Board User Manual
Revision 1.0 (04-29-13) 4 SMSC EVB8740/EVB8741
USER MANUAL
2.2 Configuration
The following sub-sections describe the various board features and configuration settings. A top view
of the EVB8740/EVB8741 is shown in
Figure 2.1 .
2.2.1 PHY Address Configuration
The EVB8740/EVB8741 allows the user to configure the default PHY address at power-up via the
PHYAD[2:0] configuration straps.
Table 2.1 details the proper configuration required for each PHY
address value. By default, all EVB8740/EVB8741 PHY address straps are configured to a value of “0”.
Figure 2.1 Top View of the EVB8740/EVB8741
Table 2.1 PHYAD[2:0] Resistor Configuration
PHYAD[2:0]
PHYAD[2:0] PULL-UP/DOWN RESISTORS
PHYAD2 PHYAD1 PHYAD0
R26 R35 R25 R36 R24 R37
000 (Default)
Depopulate Populate Depopulate Populate Depopulate Populate
001 Depopulate Populate Depopulate Populate Populate Depopulate
010
Depopulate Populate Populate Depopulate Depopulate Populate
011 Depopulate Populate Populate Depopulate Populate Depopulate
100
Populate Depopulate Depopulate Populate Depopulate Populate
101 Populate Depopulate Depopulate Populate Populate Depopulate
MII
Testpoints
VDDCR
Testpoint
Reset
Button
Integrated
RJ45 +
Magnetics
SPEED &
LINK/ACT
LEDs
(integrated in
magjack)
40-pin MII
connector
(P1)
VDDIO
Testpoint
+5V
Testpoint
+3.3V
Testpoint
SMSC
LAN8740A/
LAN8741A
GND
Testpoint
JP1 – JP4
AVDD_ETH
Testpoint