Microchip Technology EVB8740, User Manual

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EVB8740/EVB8741 Evaluation Board User Manual
SMSC EVB8740/EVB8741 5 Revision 1.0 (04-29-13)
USER MANUAL
2.2.2 Reset Mode Configuration
The EVB8740/EVB8741 can be configured to reset into a specific mode of operation at power-up via
the MODE[2:0] configuration straps.
Table 2.2 details the proper configuration required for each mode.
By default, all EVB8740/EVB8741 MODE[2:0] straps are configured to a value of “1”.
Note: For additional details on each mode of operation, refer to the LAN8740A/LAN8741A datasheet.
110
Populate Depopulate Populate Depopulate Depopulate Populate
111 Populate Depopulate Populate Depopulate Populate Depopulate
Table 2.2 MODE[2:0] Resistor Configuration
MODE[2:0]
MODE[2:0] PULL-UP/DOWN RESISTORS
MODE2 MODE1 MODE0
R28 R33 R29 R32 R30 R31
000
10BASE-T
Half Duplex
Auto-neg disabled
Depopulate Populate Depopulate Populate Depopulate Populate
001
10BASE-T
Full Duplex
Auto-neg disabled
Depopulate Populate Depopulate Populate Populate Depopulate
010
100BASE-TX
Half Duplex
Auto-neg disabled
Depopulate Populate Populate Depopulate Depopulate Populate
011
100BASE-TX
Full Duplex
Auto-neg disabled
Depopulate Populate Populate Depopulate Populate Depopulate
100
100BASE-TX
Half Duplex
Auto-neg enabled
Populate Depopulate Depopulate Populate Depopulate Populate
101
Repeater mode
Populate Depopulate Depopulate Populate Populate Depopulate
110
Power Down mode
Populate Depopulate Populate Depopulate Depopulate Populate
111 (Default)
All capable.
Auto-neg enabled
Populate Depopulate Populate Depopulate Populate Depopulate
Table 2.1 PHYAD[2:0] Resistor Configuration (continued)
PHYAD[2:0]
PHYAD[2:0] PULL-UP/DOWN RESISTORS
PHYAD2 PHYAD1 PHYAD0
R26 R35 R25 R36 R24 R37