User Manual For Cyclone LC Programmers
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Figure 4-6: Power Provided by the Cyclone to the Debug Cable
4.2.3
External Power passed through the Cyclone and out 2.5 mm barrel port
It is also possible to provide external power, passed through the Cyclone power relays, and back
out to be available to power the target board externally. This is useful when the user wants to
control the power to the target and the target board has an external power connector. Setting a
single jumper will connect the barrel port input connector on the bottom edge of the Cyclone,
through the relays, to a matched 2.5 mm barrel port output connector on the top edge of the
Cyclone, so that the power can be routed into and back out of the Cyclone.
Figure 4-7: External Power Passed Through the Cyclone and Out 2.5 mm Barrel Port
4.2.4
External Power passed through the Cyclone to the debug cable
In a slightly different scenario, the user may wish to provide power to the target through the debug
cable. On the bottom edge of the Cyclone is a 2.5 mm Power In port barrel which will pass power
through target relays which lets the Cyclone take control of the power cycling during programming.
This simple setup requires only an input to the Cyclone and a single ribbon cable connection to the
target board that handles both communication and power. The external power provided must be
between 1.6 to 5.5 volts.
