Digilent FX2 Manuel - Page 2

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FX2BB Reference Manual

Banana jacks J14-J16 provide connection

points for connecting external, bench power

supplies to the board to power the busses.

Alternatively, the power busses can be

powered from the FX2 connector or any of the

Pmod connectors. When configuring power

jumpers and powering the board, it is important

that each power supply bus be powered from a

single power source. Damage can occur if the

same bus is powered by more than one

source.

Hirose, 100 Pin, FX2 Connector

FX2 connector J11 is provided on one side of

the board for connection to Digilent system

boards like the Nexys that contain an FX2 style

connector. The Digilent FX2 connector signal

convention provides for forty general-purpose

I/O signals, three clock signals, JTAG signals,

and power busses.

The forty general-purpose I/O signals from the

FX2 connector are brought out to connector

J12. These signals are labeled IO1-IO40. See

Table 1 for a description of the relationship

between FX2 connector pins and signal names

on J12. The remaining signals from the FX2

connector are brought out to connector J13.

See Table 1 for a description of the

relationship between FX2 connector pins and

connector J13 signal names.

In addition to the FX2 connector signals,

connector J13 also provides access to the

power and ground busses.

Jumper blocks JP9 and JP10 are used to

connect or disconnect the VU and VCC busses

of the system board and the VU and VCC

busses on the FX2BB. Shorting blocks are

placed on JP9 and/or JP10 to connect the

busses, or removed to disconnect the busses.

Pmod Connectors

Digilent Pmod peripheral modules provide

various peripheral functions. These can be as

simple as buttons or switches for inputs and

LEDs for outputs, to as complex as graphical

Rev: July 18, 2006

LCD display panels, accelerometers and

keypads.

All Digilent Pmod modules use a six-wire

interface for connection to a system board. The

interface provides four I/O signals, power and

ground. The signal definitions for the four

signals as well as the voltage requirements for

the power supply depend on the specific

module.

The system board connection is through a 6-

pin male connector. In addition to the system

board connection, many Pmods, such as A/D

and D/A converters, provide interfaces to

outside signals. These connections are made

through a 6-pin female connector.

The FX2BB provides two sets of four 6-pin

connectors for connection of Pmods.

Connectors J1-J4 are male connectors for

connection to the external signal side of

Pmods like A/D or D/A converters. Connectors

J5-J8 are female connectors for connection to

the system board side of Pmods.

The signals for Pmod connectors J1-J4 are

brought out to connector J9. These signals are

labeled; J1, 1-4; J2, 1-4, etc. Similarly, the

signals for Pmod connectors J5-J8 are brought

out to connector J10 and labeled; J5, 1-4, etc.

Each Pmod connector has an associated

power select jumper. The power select jumper

for J1 is JP1 and so on. These jumpers are

used to select one of the two power busses on

the FX2BB to provide power to the power

supply pin on a Pmod plugged into that

connector position. Placing a shorting block in

the VCC position provides VCC power to the

Pmod. Placing a shorting block in the VU

position provides VU power to the Pmod. Place

a shorting block so that it hangs off of the

center pin only, disconnects power to the

Pmod.

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Digilent, Inc.

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