PCIe subsystem supports the following transactions:
- Memory Read/Write in inbound/outbound direction in Root Port (RP) and End Point (EP) modes.
- I/O Read/Write in outbound direction in RP mode.
- Configuration Read/Write in outbound direction in RP mode.
- Configuration Read/Write in inbound direction in EP mode.
- Message Transactions for interrupts and power management in RP and EP modes.
The following transactions are not supported:
- Locked Read transactions and associated messages.
- Inbound I/O Transaction Layer Packets (TLPs).
- User defined messages.