redhawk timing window

### RedHawk SDR Framework Timing Window Configuration and Issues

In the context of RedHawk, timing windows play a crucial role in static timing analysis (STA). For non-clock input pins, timing windows may not be generated by default to save runtime as these are deemed unnecessary under normal circumstances[^1]. However, specific scenarios require explicit attention.

For designs that incorporate power switches with plans for analyzing their behavior using RedHawk tools, it becomes essential to generate timing windows specifically for control pins involved. In such cases, users should terminate the current run session and consult the user manual regarding the `ADS_CELLS_NEED_INPUT_TW` variable setting which can enforce generation of necessary timing windows.

The concept of timing windows extends beyond just clock signals; they provide critical timing constraints for inputs ensuring accurate simulation results during STA processes. Some instances might involve defining toggle rates without specifying timing windows through directives like `NO_TIMING_WINDOW`, where alternative methods ensure proper signal handling despite lacking detailed timing specifications[^4].

#### Example Code Snippet Demonstrating Timing Window Definition

set_input_delay -clock clk_name 0.5 [get_ports input_port]

This snippet illustrates how one could define an input delay relative to a given clock edge, effectively establishing a timing window around the specified port within the RedHawk environment.

--related questions--

1. How does configuring ADS_CELLS_NEED_INPUT_TW impact overall performance?
2. What alternatives exist when dealing with NO_TIMING_WINDOW definitions in design files?
3. Can you explain more about integrating external clocks into timing analyses performed by RedHawk?
4. Is there any difference between Linux and Windows implementations concerning timing configurations?