6113 - What happens if you go above the maximum ramp rate of VCC and VCCAUX? In this case, what kind of problems can occur?

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• 1071 - How to resolve simultaneous switching output (SSO) ground bounce problems/simultaneous switching output sso ground bounce vcc droop noise

  As a workaround, user may try the following guideline to reduce SSO noise: 1. Add decoupling capacitors for all VCC/GND Pairs. 2. Place the decoupling capacitors as close as possible to the power and ground pins of the device. Put small capacitors ...

• 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 ...

• 848 - Should I add a series inductor between my voltage regulator output and VCC core?

  No. There are relatively high currents flowing in the VCC core, both static and dynamic. The added series L would introduce both additional series resistance and a time delay in the regulator's response to the large dynamic current changes required ...

• 6530 - Why are the power rails for DDR3_VTT and VCC_1V5 connected to one another?

  The DDR3 VCC_1V5 powers the DDR3 and the DDR3_VTT is the data buss termination, by using de-caps from DDR_VTT to gnd and VCC_1V5 the data buss is stabilized and centered between the power rails for better signal integrity for all data patterns.

• 6503 - MachXO2: Should I power up Vcc or Vccio first in my board design?

  Vcc/Vccio Power up sequence of device will not result in excessive current. It does not make much difference whether Vcc is powered up first or Vccio. There is no best or worst sequence . This is both for HC and ZE devices.