Data Sheet

3/15/2018 Arty S7 Reference Manual [Reference.Digilentinc]
https://reference.digilentinc.com/reference/programmable-logic/arty-s7/reference-manual 16/22
(https://reference.digilentinc.com/_detail/reference/programmable-logic/arty-s7/arty-s7-gpio.png?id=reference%3Aprogrammable-logic%3Aarty-
s7%3Areference-manual) Figure 7.1. Arty S7 GPIO ().
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. Additional LEDs that are not user-accessible indicate power-on, FPGA programming status,
and USB and Ethernet port status.
The Arty S7 board contains two tri-color LEDs. Each tri-color LED () has three input signals that drive the cathodes of three smaller
internal LEDs: one red, one blue, and one green. Driving the signal corresponding to one of these colors high will illuminate the internal
LED (). The input signals are driven by the FPGA through a transistor, which inverts the signals. Therefore, to light up the tri-color LED (),
the corresponding signals need to be driven high. The tri-color LED () will emit a color dependent on the combination of internal LEDs
that are currently being illuminated. For example, if the red and blue signals are driven high and green is driven low, the tri-color LED () will
emit a purple color.
Note: Digilent strongly recommends the use of pulse-width modulation (PWM) when driving the tri-color LEDs. Driving any of the inputs
to a steady logic ‘1’ will result in the LED () being illuminated at an uncomfortably bright level. You can avoid this by ensuring that none of
the tri-color signals are driven with more than a 50% duty cycle. Using PWM also greatly expands the potential color palette of the tri-color
LED (). Individually adjusting the duty cycle of each color between 50% and 0% causes the different colors to be illuminated at different
intensities, allowing virtually any color to be displayed.
Pmod connectors are 2×6, right-angle, 100-mil spaced female connectors that mate with standard 2×6 pin headers. Each 12-pin Pmod
connector provides two 3.3V VCC () signals (pins 6 and 12), two Ground signals (pins 5 and 11), and eight logic signals, as shown in Figure
8.1. The VCC () and Ground pins can deliver up to 1A of current, but care must be taken not to exceed any of the power budgets of the
onboard regulators or the external power supply (these are described in the “Power supplies” section).
Digilent produces a large collection of Pmod accessory boards that can attach to the Pmod expansion connectors to add ready-made
functions like A/D’s, D/A’s, motor drivers, sensors, and other functions. See www.digilentinc.com (http://www.digilentinc.com) for more
information.
The Arty S7 has four Pmod connectors, some of which behave differently than others. Each Pmod connector falls into one of two
categories: standard or high-speed. Also, some Pmod connectors share their connections with the inner rows of the shield connector, and
should not be used at the same time as a shield that requires those pins. Table 8.1 specifies which category each Pmod falls into, whether it
shares any pins with the shield connector, and also lists the FPGA pins they are connected to. The following sections describe the different
types of Pmods.
(https://reference.digilentinc.com/_detail/basys3-pmod_connector.png?id=reference%3Aprogrammable-logic%3Aarty-s7%3Areference-manual) Figure
8.1. Pmod connector.
Pmod JA Pmod JB Pmod JC Pmod JD
Pmod Type High-Speed High-Speed Standard Standard
Shared pins – – IO34-IO41 IO26-IO33
Pin 1 L17 P17 U15 V15
Pin 2 L18 P18 V16 U12
Pin 3 M14 R18 U17 V13
Pin 4 N14 T18 U18 T12
Pin 7 M16 P14 U16 T13
7.1 Tri-Color LEDs
8 Pmod Connectors
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