User Manual

Table 8.1: USB104 A7 Pmod Pinout.
Pmod JA Pmod JB Pmod JC
Pmod Type Standard Standard Standard
Pin 1 F4 C4 C5
Pin 2 F3 B2 C6
Pin 3 E2 B3 B6
Pin 4 D2 B4 C7
Pin 7 H2 B1 A5
Pin 8 G2 A1 A6
Pin 9 C2 A3 B7
Pin 10 C1 A4 D8
The standard Pmod connectors are connected to the FPGA via 200 Ohm series resistors. The series resistors prevent short circuits that
can occur if the user accidentally drives a signal that is supposed to be used as an input. The downside to this added protection is that
these resistors can limit the maximum switching speed of the data signals.
The USB104 A7 includes 2 push buttons and 4 individual LEDs, as shown in Figure 7.1.
The push buttons are connected to the FPGA via series resistors to prevent damage from inadvertent short circuits which could occur if
an FPGA pin assigned to a button was defined as an output. The two push buttons are “momentary” switches that normally generate a
low output when they are at rest, and a high output only when they are pressed.
The four individual high-efficiency LEDs are anode-connected to the FPGA via 330-ohm resistors, so they will turn on when a logic
high voltage is applied to their respective I/O pin.
Figure 9.1. USB104 A7 GPIO ()
9. User GPIO