The PROM description area in the PROM File Formatter window represents the structure of your PROM file. It consists of one or more data streams. A data stream is a collection of one or more concatenated BIT files used to implement a single user application.
The PROM description area display shows BIT files in the order they will be loaded into the devices on the chain. The top BIT file is loaded into the first device, and the bottom BIT file is loaded into the last device.
Before programming a daisy chain of FPGA devices, you must first concatenate the BIT files together. Each BIT file corresponds to an FPGA in the daisy chain.
The “Configuration Data Streams” figure depicts the structure of a typical PROM file designed to configure a single daisy chain of devices in master mode. Data Stream #1 configures a daisy chain of two devices. Data Stream #2 reconfigures the same daisy chain to perform a different function.
