7238 - Certus-NX: What to do with an unused SerDes power supply and other pins?

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• 738 - How should user connect unused I/O pins in a Lattice device?

  I/O pins which are unused in a design typically do not need to be grounded or connected anywhere. Some of the devices have global setting for pull-ups on I/O likes -Up, -Down or Bus-Hold, and others may have settings for each pin. By default, Lattice ...

• 674 - POWR1014/A: Why should user avoid supply power to POWR1014's VCCPROG pin when VCCA and VCCD pins are powered on?

  Description: Power must NEVER be supplied to the VCCPROG pin when VCCD and VCCA are powered on. Operation under these conditions is undefined and may result in erroneous operation. User should supplied power to the VCCPROG pin on POWR1014 only when ...

• 1983 - Should I add a ferrite bead to the VCC core voltage supply?

  No, you do not need to add a ferrite bead between your VCC regulator output and the VCC pins on the FPGA. There are two reasons for not adding the ferrite bead, the first being that the VCC pins are less susceptible to power supply noise so they do ...

• 6531 - Certus-NX: What are the recommendation on power filtering for DDR3? (BYPASS CAPACITORS TO GROUND, VDD, OR BOTH)

  All three methods of connecting DDR bypass capacitors can work well, to ground / to VDD / or to both. The key is to minimize the inductance of bypass capacitor connections to improve performance, bypassing to the closest PCB reference plane (VDD or ...

• 2855 - Power Manager II: Do I need to connect a 100 ohm series resistor between monitored voltages and VMON pins on the POWR1220AT8 device?

  No, you can connect the VMON pins directly to monitored voltages which are between 0 and 5.9V. Some of the Lattice evaluation board schematics do include a resistor between the monitored voltage and the VMON pins. This is typically only used with the ...