Xilinx ML50 Series User Manual

ML501 Evaluation Platform www.xilinx.com 33UG226 (v1.3) November 10, 2008Detailed DescriptionR33. SPI FlashThe ML501 board has a 16-Mb SPI Flash (ST Microelectronics M25P16). The SPI Flash canbe used for FPGA configuration or to hold user data. The SPI Flash can be in-systemprogrammed using a Xilinx download cable.34. IIC Fan Controller and Temperature/Voltage MonitorOnboard temperature and voltage monitoring and control is handled by an AnalogDevices ADT7476A chip. This chip is controlled via IIC and can provide the followingfunctions:• Measure the voltage of 5V, 3.3V, 1.8V, and 1.0V supplies• Measure FPGA temperature via DXP/DXN pins on the FPGA• Measure ambient temperature• Read power good status signals from 2.5V linear regulators• PWM control of fan speed• Fan Tachometer readings• Generate interrupts/alarms based on readingsConnector J31 is a keyed three-pin fan header similar to those found in computers. It isdesigned to support a 5V DC fan. To bypass the fan controller chip and operate the fan atfull speed, the user can populate connector J32.For high-power operating conditions, a heatsink and/or fan for the FPGA can beaccommodated on the board. The ML501 does not ship with a heatsink/fan unit but canaccommodate one (for example, Calgreg Electronics Smart-CLIP family of heatsink/fanassemblies).35. PiezoA piezo audio transducer is provided to allow simple beeps, tones, and songs to be played.The piezo is driven by a transistor controlled by the FPGA.36. FMC Connectors for Power Supply AnalysisThe FMC connector (Rosenberger 16P101-40M L4) is a small, form-factor, surface mount,50Ω coaxial connector suitable for high-frequency signal analysis.The board has a pair of FMC connectors attached to 1.0V power supply. This permits theuser to perform spectrum analysis of the behavior of the power supply during boardoperation. This can help the user tune the power supply decoupling network for optimalperformance. Because two FMC connectors are attached to the same power supply (onopposite sides of the board), the user can use one FMC connector to inject a high frequencysignal into the power plane while the second FMC is connected to test equipment thatmeasures the response of the board.By default, the FMC connectors are not soldered on. Contact Rosenberger of NorthAmerica (www.rosenbergerna.com) to order the FMC connector. Rosenberger alsomanufactures adapter cables that allow SMA-based test equipment or cables to beconnected to the FMC connectors.Note: Xilinx is not responsible for damage caused by a user attempting to solder the FMCconnectors onto the board.