Configuration PROMs have no specific requirements unique to Tandem Configuration. However, to meet the 100 ms specification, you must select a PROM that meets the following three criteria:
1. Supported by AMD configuration.
2. Sized appropriately for both stage 1 and stage 2; that is, the PROM must be able to contain the entire bitstream.
° For Tandem PROM, both stage 1 and stage 2, are stored here; this bitstream is slightly larger (4-5%) than a standard bitstream.
° For Tandem PCIe, the bitstream size is typically about 1 MB, but this can vary slightly due to design implementation results, device selection, and effectiveness of compression.
3. Me e t s the configuration time r e qui r em e n t fo r PC I E x p r e s s b a s e d o n th e first- s t age bi t s t r ea m siz e an d th e calcu l at i on s fo r th e b i t s t r ea m l o a d in g time. See Calculating Bitstream Load Time for Tandem .
Se e th e UltraScale Architecture Configuration User Guide (UG570) [Ref 7] for a list of supported PROMs and device bitstream sizes.