Altera PCI Compiler - Manual (Page 258)

6–8 User Guide Version 11.1 Altera Corporation
PCI Compiler October 2011
Value of Multiple Pending Reads
6. At some point the data for R1 is returned by the Avalon-MM
peripheral. Meanwhile, all read transactions are automatically
retried by the PCI-Avalon bridge.
7. PCI Agent 1 issues R1 again, the PCI-Avalon bridge provides the
requested data and completes R1.
For more information on multiple pending read transactions, refer to
“Prefetchable Read Operations” on page 7–23 and “Avalon-to-PCI
Read Requests” on page 7–32 .