Digilent Vmod Breadboard
Reference Manual
Revision: December 15, 2010
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Overview
The Digilent Vmod Breadboard (VmodBB)
offers a ready-made solution for prototyping
breadboarded or wire-wrapped circuits as
accessories to Digilent system boards. The
VmodBB provides connectors suitable for
direct connection of various Digilent system
boards.
The VmodBB is available in a wire-wrap
version or a solderless breadboard version.
Features include:
•
•
•
•
•
VHDCI connector for connection to
Digilent System boards
Two 32 pin breadboards with 16 pins
each, connected directly to signals from
the system board
Two power and one ground bus around
Prototype connections on every signal
Ships with two 300 tie point
breadboards separated by a 100 tie
point bus strip.
Figure 1
Digilent Vmod Breadboard
The usual Digilent convention is to power the
VCC bus at 3.3V and the VU bus at 5.0V.
However depending on the system board
connected, other voltages may be present.
68 Pin, VHDCI Connector
VHDCI connector J1 is provided on one side of
the board for connection to Digilent system
boards like the Genesys that contain a VHDCI
style connector. The Digilent VHDCI connector
signal convention provides for 40 general-
purpose I/O signals.
28 of the 40 general-purpose I/O signals from
the VHDCI connector are brought out to
connectors BB1 and BB2. These signals are
labeled IO1-IO28. See Table 1 and Table 2 for
a description of the relationship between
VHDCI connector pins and signal names on
BB1 and BB2.
Functional Description
The Digilent Vmod Breadboard (VmodBB) is
used to connect a breadboard to the VHDCI
connector and implement up to 28 IO signals
to or from Digilent system boards.
Power Connection
The VmodBB provides two power busses and
a ground bus. The two power busses are
labeled VU and VCC and are powered through
the VHDCI connector. These two busses are
made available at each connector position on
the board. There is also a ground plane that
connects the ground pins from all connectors
together.
Doc: 502-184
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