Knowledge Base Article
Answer: The STA feature is added to PSoC Creator 1.0 and later versions. It supports only PSoC 3 and PSoC 5LP devices but not PSoC 3 ES2 samples or PSoC 5 ES1 devices.
Therefore, if the project based on PSoC 3 ES2 or PSoC 5 ES1 compiles without any warning, it is because the tool is disabled for those devices and the design is not guaranteed to work as expected if it fails due to timing issues. For more information about STA, refer to the application note: AN81623 – “PSoC® 3 and PSoC 5 Digital Design Best Practices.