Zybo Z7 Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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16.4 High-Speed Pmod
The High-speed Pmod ports use the standard Pmod connector, but 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 Zybo 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 80 ohm (+/- 10%) differential.
These ports should be used only when high speed signaling is required or the other suitable ports are occupied. If
used as single-ended, coupled pairs may have significant cross-talk. In applications where this is a concern, the
standard Pmod port should be used. Another option would be to ground one of the signals 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.
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