ANET1553 Users Manual
33
Note:
The discrete outputs don’t provide a series resistor for over current protection.
If using a discrete input, make sure that the output-mode for that discrete is
disabled, before connecting an external voltage, otherwise the output driver
transistor can be damaged caused by a high short circuit current to GND.
Figure 4-4 Discrete I/O circuitry
Ground
Discrete I/O-Pin connector
ANET1553
Pulldown
resistor
Current
limiting
Resistor
1 kOhm
Onboard
5V
Current
limiting
Resistor
10 kOhm
Input-Pin
FPGA
Ground
Discrete output circuitry
Discrete input circuitry
Output-Pin
FPGA
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