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Platform Cable USB II
If an iMPACT session is active when an Output → Cable Disconnect or Output → Disconnect All Cables operation is
performed, or if the cable is physically disconnected from the host system, the Cable Status Bar ( Figure 7, page 9 ) at the
bottom, right-hand edge of the GUI immediately indicates "No Cable Connection."
Xilinx design tools employ system semaphores to manage access to Xilinx cables, allowing multiple applications to
simultaneously access (connect to) a single cable (but only one application can perform cable operations at a given time).
For example, assume two instances of iMPACT (instance A and instance B) are connected to a single cable. If A begins a
programming operation, and B then attempts a programming operation, B is temporarily blocked from accessing the cable.
B receives a message indicating that the cable is locked, and the operation must be attempted again later.
Multiple USB Cable Management
Platform Cable USB II contains a 64-bit electronic serial number used by applications to uniquely identify and access a
specific USB cable when multiple USB cables (up to 127) are connected to the same host. iMPACT provides a dialog box
( Figure 6, page 7 ) allowing users to select a specific cable from a list of attached cables. When one of the cables in the list
is highlighted, the status LED on the appropriate cable blinks, allowing users to make a logical-to-physical association. When
the desired cable is connected and the dialog box closed, the status LED no longer blinks.
The Cable Setup Information dialog box ( Figure 6 ) appears when the Advanced USB Cable Setup button is pressed in the
Cable Communication Setup dialog box ( Figure 5 ).
Note: The multiple USB cable management feature is only available in iMPACT version 10.1 and later. Refer to the iMPACT section of
Xilinx ISE software manuals for additional details on this feature.
X-Ref Target - Figure 6
DS593_06_021408
Figure 6: iMPACT (10.1) Cable Setup Information
Configuration Clock Speed
The Platform Cable USB II configuration clock (TCK_CCLK_SCK) frequency is selectable. Table 2 shows the complete set
of available TCK_CCLK_SCK speed selections.
Table 2: Configuration Speed Selections
TCK_CCLK_SCK Frequency
24
12
6 (Default)
3
1.5
750
DS593 (v1.2.1) March 17, 2011
Units
MHz
MHz
MHz
MHz
MHz
kHz
7
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