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DP83640 DEMO BOARD USER GUIDE
2.6
LEDs
Various LEDs are provided to assist the user in determining the state of operation of the board.
Table 4 and Table 5 clarify the relationship between the LEDs and Jumpers.
Table 4. List of LEDs with Jumpers
LED
Associated Jumper
Function
Revision 1 Revision 2 Revision 3
D1
Interrupt Indication
D2
MII Power Supply Indication
D13
D13 / D21 D13 / D33
J42
GPIO8
D10
D10 / D19 D10 / D30
J39
Link (GPIO7)
D7
D7 / D17
D7 / D27
J36
Speed (GPIO6)
D4
D4 / D15
D4 / D24
J33
Activity (GPIO5)
D12
D12 / D20 D12 / D32
J41
GPIO4
D9
D9 / D18
D9 / D29
J38
GPIO3
D6
D6 / D16
D6 / D26
J35
GPIO2
D3
D3 / D14
D3 / D23
J32
GPIO1
Revision 1 and 2
Revision 3
Table 5. LED/Jumper Order
LEDs can be used to indicate the state of GPIOs 1 through 8. When it is desired that the LED is
“ON” when the GPIO is “LOW”, the associated jumper should be set to the “UP” state. With this
setting a GREEN LED will be illuminated. When it is desired that the LED is “ON” when the GPIO
is “HIGH”, the associated jumper should be set to the “DN” state. In this case, an AMBER LED
has been incorporated in the circuit.
Care should be taken when selecting the LED polarity of
the GPIO which also function as strap inputs.
