Arty Z7 Reference Manual
Transfer Multisort Elektronik / tme.eu
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15.1 High-Speed Pmods
The High-speed Pmods have their data signals routed as impedance matched differential pairs
for maximum switching speeds. They have pads for loading resistors for added protection, but
the Arty Z7 ships with these loaded as 0-Ohm shunts. With the series resistors shunted, these
Pmods offer no protection against short circuits, but allow for much faster switching speeds.
The signals are paired to the adjacent signals in the same row: pins 1 and 2, pins 3 and 4, pins
7 and 8, and pins 9 and 10.
Traces are routed 100 ohm (+/- 10%) differential.
If pins on this port are used as single-ended signals, coupled pairs may exhibit crosstalk. In
applications where this is a concern, one of the signals should be grounded (drive it low from
the FPGA) and use its pair for the signal-ended signal.
Since the High-Speed Pmods have 0-ohm shunts instead of protection resistors, the operator
must take precaution to ensure that they do not cause any shorts.
16 Arduino/chipKIT Shield Connector
The Arty Z7 can be connected to standard Arduino and chipKIT shields to add extended
functionality. Special care was taken while designing the Arty Z7 to make sure it is
compatible with the majority of Arduino and chipKIT shields on the market. The shield
connector has 49 pins connected to the Zynq PL for general purpose Digital I/O on the Arty
Z7-20 and 26 on the Arty Z7-10. Due to the flexibility of FPGAs, it is possible to use these
pins for just about anything including digital read/write, SPI connections, UART connections,
I2C connections, and PWM. Six of these pins (labeled AN0-AN5) can also be used as single-
ended analog inputs with an input range of 0V-3.3V, and another six (labeled AN6-11) can be
used as differential analog inputs.
Note: The Arty Z7 is not compatible with shields that output 5V digital or analog
signals. Driving pins on the Arty Z7 shield connector above 5V may cause damage to the
Zynq.
