The configuration for Example 1 is:
• Quad SPI flash (x4) operating at 66 MHz ± 200 ppm
• Stage 1 size = 9175424 bits = 8.75 Mb
The steps to calculate the configuration loading time are:
1. Calculate the minimum clock frequency:
66 MHz × (1 - 0.0002) = 65.98 MHz
2. Calculate the minimum PROM bandwidth:
4 bits × 65.98 MHz = 263.92 Mb/s
3. Calculate the first-stage bitstream loading time:
8.75 Mb / 263.92 Mb/s = ~0.0 332 s or 33.2 ms