- Assert
GRST and
PERST to the device.
- Apply 1.5-V and 3.3-V voltages.
- Deassert
GRST.
- Apply a stable PCI Express reference clock.
- To meet PCI Express specification requirements,
PERST cannot be deasserted until the following two delay requirements are satisfied:
- Wait a minimum of 100 μs after applying a stable PCI Express reference clock. The 100-μs limit satisfies the requirement for stable device clocks by the deassertion of
PERST.
- Wait a minimum of 100 ms after applying power. The 100-ms limit satisfies the requirement for stable power by the deassertion of
PERST.
See the power-up sequencing diagram in Figure 6-1.