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Intel: What address space, transactions does PCI-Express have?
PCI Express
It has four spaces: memory, I/O, configuration, and message, and each has a corresponding transaction.
| memory transaction | Data transfer to/from memory space |
| I/O transaction | Data transfer with I/O space |
| Configuration transaction | Device configuration and initialization |
| message transaction | Notification of events (such as interrupts) and general message transmission |
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