The configuration for Example 1 is:
- Quad SPI flash (x4) operating at 66 MHz ± 200 ppm
- Stage 1 size = 11822112 bits = 11.27 Mb
The steps to calculate the configuration loading time are:
- Calculate the minimum clock frequency:66 MHz × (1 - 0.0002) = 65.98 MHz
- Calculate the minimum PROM bandwidth:4 bits × 65.98 MHz = 263.92 Mb/s
- Calculate the first-stage bitstream loading time:11.27 Mb / 263.92 Mb/s = ~0.0427 or 42.7 ms