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Platform Cable USB II
X-Ref Target - Figure 30
(A)
12 Mb/s Bus Speed
1.X Root Hub
500
mA
(B)
12 Mb/s Bus Speed
1.X Root Hub
500
mA
(C)
480 Mb/s Bus Speed
2.0 Root Hub
500
mA
(D)
480 Mb/s Bus Speed
2.0 Root Hub
500
mA
(E)
480 Mb/s Bus Speed
2.0 Root Hub
500
mA
Power
Power
Platform Cable
USB II
2.0 External
Bus-Powered
Hub
2.0 External
Self-Powered
Hub
2.0 External
Self-Powered
Hub
Platform Cable
USB II
Enumerates at
Enumerates at
full speed because
root hub only
< 500
mA
< 500
mA
500
mA
Hi-Speed — best
performance due to
operates at full
speed — degraded
high bus speed.
performance due
to slow bus speed
Platform Cable
USB II
Enumerates at
full speed because
root hub only
operates at full
speed — degraded
performance due
to slow bus speed
Platform Cable
USB II
Enumerates at full speed
because 2.0 external
hub operates at full
speed — degraded
performance due to slow
bus speed. Cable may
not enumerate.
Platform Cable
USB II
Enumerates at
Hi-Speed — best
performance due to
high bus speed.
DS593_30_021408
Figure 30: Platform Cable USB II Performance with Various Hub Types
Interface Pin Descriptions
Table 6: JTAG/SPI/Slave Serial Port: 2-mm Connector Signals
Pin
Number
JTAG
Configuration
MODE
SPI
Programming (1)
Slave-Serial
Configuration
Direction (2)
Description
Target Reference Voltage (3) . This pin
should be connected to a voltage bus on the
target system that serves the JTAG, SPI or
2
V REF
V REF
V REF
In
Slave Serial interface. For example, when
programming a CoolRunner-II device using
JTAG, V REF should be connected to the
target V AUX bus.
JTAG Test Mode Select . This pin is the
4
TMS
–
–
Out
JTAG mode signal establishing appropriate
TAP state transitions for target ISP devices
sharing the same data stream.
JTAG Test Clock . This pin is the clock
6
TCK
–
–
Out
signal for JTAG operations and should be
connected to the TCK pin on all target ISP
devices sharing the same data stream.
JTAG Test Data Out . This pin is the serial
8
TDO
–
–
In
data stream received from the TDO pin on
the last device in a JTAG chain.
DS593 (v1.2.1) March 17, 2011
www.xilinx.com
29
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