- PF0/PF1 Enable MSI Capability Structure
- Indicates that the MSI Capability structure exists.Note: Although it is possible to not enable MSI or MSI-X, the result would be a non-compliant core. The PCI Express Base Specification requires that MSI, MSI-X, or both be enabled.
- Multiple Message Capable
- Selects the number of MSI vectors to request from the Root Complex.