Mini-Smp Connectors For Power Supply Analysis - Xilinx ML405 User Manual

Chapter 1: ML405 Evaluation Platform
SATA MGT Clock Generation
An Integrated Circuit Systems ICS844051-1 chip generates a high-quality, low-jitter,
75-MHz or 150-MHz LVDS clock from an inexpensive 25-MHz crystal oscillator. This clock
is sent to the MGT driving the SATA connectors. Jumper J37 sets the SATA MGT clock
frequency
input of the FPGA to set the common mode voltage.
Table 1-20: Configuration for SATA MGT Clock Signals
SGMII / Loopback MGT Clock Generation
An Integrated Circuit Systems ICS844031I chip generates a high-quality, low-jitter,
250-MHz LVDS clock from an inexpensive 20-MHz crystal oscillator on all RoHS-
compliant boards. For non-RoHS-compliant boards, an ICS844021I chip generates a high-
quality, low-jitter, 125-MHz LVDS clock from an inexpensive 25-MHz crystal oscillator.
See
to the MGTs driving the SGMII or onboard loopback interfaces. Series AC coupling
capacitors are also present to allow the clock input of the FPGA to set the common mode
voltage.

38. Mini-SMP Connectors for Power Supply Analysis

The Mini-SMP connector (Rosenberger 18S101-40ME4) is a small, form-factor, surface-
mount, 50Ω coaxial connector suitable for high-frequency signal analysis.
The board supports having a pair of Mini-SMP connectors attached to each of the main
power supplies. This permits the user to perform spectrum analysis of the behavior of the
power supply during board operation. This can help the user tune the power supply
decoupling network for optimal performance. Because two Mini-SMP connectors are
attached to a given power supply, the user can also use one Mini-SMP connector to inject a
high frequency signal into the power plane while the second Mini-SMP is connected to test
equipment that measures the response of the board.
By default, the Mini-SMP connectors are not soldered on. Contact Rosenberger of North
America (www.rosenbergerna.com) to order the Mini-SMP connector. Rosenberger also
manufactures adapter cables that allow SMA-based test equipment or cables to be
connected to the Mini-SMP connectors.
Note:
connectors onto the board.
32
(Table 1-20). Series AC coupling capacitors are also present to allow the clock
SATA Clock Signal
SATA Clock Frequency
Appendix A, "Board Revisions"
Xilinx is not responsible for damage caused by a user attempting to solder the Mini-SMP
www.xilinx.com
Board Connection
Jumper J37
• Jumper Off = 75 MHz
• Jumper On = 150 MHz
for details on MGT clocking. The SGMII clock is sent
ML405 Evaluation Platform
UG210 (v1.5.1) March 10, 2008
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