A configuration scheme in which an external controller passes configuration data to one or more FLEX^® 6000 devices via an asynchronous serial data stream.

The device is treated as a slave device with a 5-wire interface to the external controller. The external controller can be an intelligent host such as a microcontroller or CPU.

The Quartus^® II Compiler automatically generates SRAM Object Files (.sof) that contain the data for configuring a FLEX 6000 device in a PSA configuration scheme.