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Chapter 10: Recording Options
10.3.1 Very Slow Clock Usage
The Voyager M3 USB 3.0 Verification platform supports slower than standard clock rates
for prototype and simulation testing. All Voyager 3.0 Pro systems include the option to
select ½ and ¼ clock rates. This Gigabit clock can operate at 2.5 GHz (5 Gbps),
1.25 GHz (2.5 Gbps), and 625 MHz (1.25 Gbps) over standard USB cables. This
"fractional clock" mode is also supported over the SMA (coaxial) inputs on the front of
Voyager platforms that include the SMA option.
Two extra-cost slow clock options can enable use of external clock sources to
synchronize the frequency of the Voyager system at slower clock rates:
•
The upper-end of this external clocking supports rates from 12.5 MHz (25 Mbps) to
as low at 350 kHz (700 Kbps). The Voyager slow clock kit USB-AC01-V01-X
(see the table below) provides this capability and includes SMA-to-MMCX cables for
attaching the external clock source. The external clock source is generated by the
system ref-clock on the DUT or by a dedicated clock generator.
•
To achieve clock frequencies below 350 kHz requires minor customization of the
Voyager hardware platform. LeCroy offers customization option USB-AC06-V01-X
to remove capacitors on the SMA inputs only. This allows users to configure input
frequencies at rates lower than 800 Hz for both protocol traffic generation and
analysis.
The table below outlines Voyager options for slow clock.
Model Number
USB-TZP3-V02-X
Voyager M3i Voyager M3i Pro Analyzer - Exerciser System
USB-AC01-V01-X
Voyager M3i USB 3.0 Slow Clock kit
(includes 4 MMCX-to-SMA adapter cables and
software license to support external clock input for Voyager M3
USB 3.0 analyzer and exerciser platform)
USB-AC06-V01-A
Voyager USB 3.0 Custom MMCX Slow Clock
(custom MMCX-SMA port for ultra slow clock operation)
USB-FE03-V01-X
Voyager M3 USB 3.0 SMA probe kit
(includes eight (8) MMCX-to-SMA cables and license key for
SMA differential input tap)
242
USB Protocol Suite User Manual
Clock Frequency
2.50 GHz (5.00 Gbps)
1.25 GHz (2.50 Gbps)
625 MHz (1.25 Gbps)
12.5 MHz to 350 kHz
Below 350 kHz
NA
LeCroy Corporation
Included
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