Cyclone Universal & Cyclone Universal FX - User Manual
18
Figure 3-13: Communications Mode Selection
3.27
Ribbon Cable
The
Cyclone Universal
and
Cyclone Universal
FX
communicate with the target through ribbon
cables. The ribbon cables for standard debug connectors have a 0.100-inch centerline dual row
socket IDC assembly (not keyed). The ribbon cables for 10- and 20-pin mini debug connectors
have a 0.050-inch centerline dual row socket IDC assembly (keyed). The ribbon cables are
designed such that the Cyclone’s Debug Connector has the same pinout as the Target Header,
i.e., Pin 1 of the Cyclone’s Debug Connector is connected to Pin 1 of the Target Header. As an
example,
Figure 3-14
sketches the connection mechanism (looking down into the sockets) for a
14-pin ribbon cable. Ribbon cables for other supported architectures use a similar scheme, but
may have more or fewer pins.
Figure 3-14: Ribbon Cable Example Diagram, When Looking Into IDC Socket
3.28
Target Power Management
The
Cyclone Universal
and
Cyclone Universal
FX
provide four power management schemes,
and they also allow for the target to be powered independently of the Cyclone. When managed by
the Cyclone, the target board may derive power from the use of the Cyclone’s power jacks, by the
use of the debug connector TVCC pin, or a combination of both. The options are explained in
detail below. Each configuration has an associated jumper setting that MUST be set on the
Cyclone.
Note:
If these jumpers are not set correctly, the Cyclone will not function as intended.
Open the Cyclone’s lid to access the jumpers. The specific location of the jumpers is indicated by
the label POWER JUMPERS in
Figure 3-5
.
