Intel® Hyperflex™ Architecture High-Performance Design Handbook

ID 683353
Date 10/04/2021

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2.2.7. Initial Power-Up Conditions

The initial condition of your design at power-up represents the state of the design at clock cycle 0. The initial condition is highly dependent on the underlying device technology. Once the design leaves the initial state, there is no automated method to return to that state. In other words, the initial condition state is a transitional rather than functional state. In addition, other design components can affect the validity of the initial state. For example, a PLL that is not yet locked upon power-up can impact the initial state.

Therefore, do not rely on initial conditions when designing for Intel® Hyperflex™ architecture FPGAs. Rather, use a single reset signal to place the design in a known, functional state until all the interfaces have powered up, locked, and trained.