HW-FLYLEADS Xilinx Inc, HW-FLYLEADS Datasheet - Page 15

• Manufacturer Part Number: HW-FLYLEADS
• Description: LEAD WIRES FLYING CABLE III/IV
• Manufacturer: Xilinx Inc

Specifications of HW-FLYLEADS

• Accessory Type: Parallel Cable
• For Use With/related Products: Xilinx FPGA, CPLDS, Platform Flash PROMs, XC18V00 PROMs, System ACE MPM
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 122-1473

Hub Types and Cable Performance
There are two important hub specifications that affect the
performance of Platform Cable USB: maximum port current
and total bandwidth.
Maximum Port Current
Platform Cable USB is a bus-powered device that draws
less than 100 mA from the host USB port under all
operating conditions.
Note:
than 100 mA from the host USB port. The legacy DLC9 cable
model requires 230 mA to operate in USB 2.0 Hi-Speed mode or
150 mA to operate in USB 2.0/1.1 full-speed mode. Some older
root hubs or external bus-powered hubs might restrict devices to
100 mA. The legacy DLC9 cable model does not enumerate on
hubs with the 100 mA restriction.
Total Bandwidth
The maximum achievable bandwidth for a single USB 1.1
full-speed device is 8 Mb/s. The maximum theoretical
bandwidth for a single USB 2.0 Hi-Speed device is 56 Mb/s.
X-Ref Target - Figure 29
DS300 (v3.2) May 14, 2008
Product Specification
The DLC9G and legacy DLC9LP cable models draw less
12 Mb/s Bus Speed
full-speed because
Platform Cable
to slow bus speed
performance due
1.X Root Hub
Enumerates at
operates at full
root hub only
R
Degraded
speed —
USB
(A)
500
mA
Figure 29: Platform Cable USB Performance with Various Hub Types
12 Mb/s Bus Speed
1.X Root Hub
Bus-Powered
2.0 External
operates at full-speed
performance due to
full-speed because
Hub
Platform Cable
(B)
slow bus speed
Enumerates at
root hub only
— Degraded
500
mA
USB
< 500
mA
480 Mb/s Bus Speed
www.xilinx.com
Bus-Powered
2.0 Root Hub
2.0 External
due to slow bus speed
hub supplies < 500 mA
degraded performance
bus-powered external
Typically, enumerates
at full-speed because
per port — Possible
Hub
Platform Cable
(C)
500
Because hub bandwidth must be shared among all
connected devices, actual bandwidth could be lower.
If Platform Cable USB is attached to a 1.1 hub, configuration
speed is degraded. Communication overhead and protocol
limit any given device to approximately 30% of total
bandwidth. For 1.1 hubs, the best achievable throughput is
approximately 3.6 Mb/s (refer to
If an external 2.0 hub is attached to a 1.1 root hub, operation
is at full speed (refer to
operation is guaranteed only if Platform Cable USB is
attached directly to a 2.0 root hub, or to an external self-
powered 2.0 hub that is connected to a 2.0 root hub (refer to
Figure
If Platform Cable USB is attached to an external, bus-
powered 2.0 hub, it could enumerate as a full-speed device
(refer to
of 500 mA to all connected devices. If individual ports on
bus-powered hubs are limited to less than 150 mA, Platform
Cable USB does not enumerate and is unavailable for use
by host software applications.
mA
USB
< 500
mA
29D and
Figure
Power
480 Mb/s Bus Speed
Self-Powered
2.0 Root Hub
2.0 External
29C). Bus-powered hubs can deliver a total
Figure
Hi-Speed since external
supply 500 mA per port
due to high bus speed
self-powered hub can
— Best performance
Hub
Platform Cable
(D)
Enumerates at
500
mA
29E).
USB
Figure
500
mA
29B). Hi-Speed USB
Figure
480 Mb/s Bus Speed
Platform Cable
to high bus speed
2.0 Root Hub
performance due
per port — Best
Hi-Speed since
supply 500 mA
Enumerates at
root hub can
Platform Cable USB
29).
USB
DS300_27_021607
(E)
500
mA
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