User manual

Basys MX3™ Board Reference Manual
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Page 43 of 56
19.2 Functionality
The Analog Input module is implemented in the ADC library of the Basys MX3 library pack. Implementation
features include:
 The ADC module is properly initialized.
 Channel 2 is read (corresponding to AN2).
If the users want to acquire data using the Analog Input module without the ADC library, they need to implement
their own ADC functionality.
20 Pmod Connectors
The Basys MX3 provides two host connectors for Digilent Pmods. The Pmod connectors, labeled PMOD A and
PMOD B, are 2x6 right-angle, female pin header connectors.
The schematic diagram in Fig. 20.1 depicts the signals routed to the two connectors.
Figure 20.1. Pmod schematic diagram.
The pin numbering that Digilent uses on the twelve-pin Pmod connectors may not seem typical. In the upper row
the pins are numbered 1–6, left to right (when viewed from the top, middle of the board), and the pins in the
lower row are numbered 7–12, left to right. This complies with the convention that the upper and lower rows of
pins can be considered as two stacked six-pin connectors. When viewed from the end of the connector, pin 1 is the
upper right pin and pin 7 is immediately below. Pin 1 is labeled on the Basys MX3 board with “1” and can be
recognized by its squared pad (both on the main board and on the Pmod device).
Each row of pins provides a pair of VCC (3.3V) and GND, as shown Fig. 20.2.