
Chapter 6: Register Descriptions 6–9
PCI Express Avalon-MM Bridge Control Register Content
August 2014 Altera Corporation IP Compiler for PCI Express User Guide
The PCI Express-to-Avalon-MM mailbox registers are writable at the addresses shown
in Table 6–15. Writing to one of these registers causes the corresponding bit in the
Avalon-MM interrupt status register to be set to a one.
The Avalon-MM-to-PCI Express mailbox registers are read at the addresses shown in
Table 6–16. The PCI Express root complex should use these addresses to read the
mailbox information after being signaled by the corresponding bits in the PCI Express
interrupt enable register.
Avalon-MM-to-PCI Express Address Translation Table
The Avalon-MM-to-PCI Express address translation table is writable using the CRA
slave port if dynamic translation is enabled.
Table 6–15. PCI Express-to-Avalon-MM Mailbox Registers, Read/Write Address Range: 0x800-0x0815
Address Name Access Description
0x0800 P2A_MAILBOX0 RW PCI Express-to-Avalon-MM Mailbox 0
0x0804 P2A_MAILBOX1 RW PCI Express-to-Avalon-MM Mailbox 1
0x0808 P2A_MAILBOX2 RW PCI Express-to-Avalon-MM Mailbox 2
0x080C P2A_MAILBOX3 RW PCI Express-to-Avalon-MM Mailbox 3
0x0810 P2A_MAILBOX4 RW PCI Express-to-Avalon-MM Mailbox 4
0x0814 P2A_MAILBOX5 RW PCI Express-to-Avalon-MM Mailbox 5
0x0818 P2A_MAILBOX6 RW PCI Express-to-Avalon-MM Mailbox 6
0x081C P2A_MAILBOX7 RW PCI Express-to-Avalon-MM Mailbox 7
Table 6–16. Avalon-MM-to-PCI Express Mailbox Registers, read-only Address Range: 0x0900-0x091F
Address Name Access Description
0x0900 A2P_MAILBOX0 RO Avalon-MM-to-PCI Express Mailbox 0
0x0904 A2P_MAILBOX1 RO Avalon-MM-to-PCI Express Mailbox 1
0x0908 A2P_MAILBOX2 RO Avalon-MM-to-PCI Express Mailbox 2
0x090C A2P_MAILBOX3 RO Avalon-MM-to-PCI Express Mailbox 3
0x0910 A2P_MAILBOX4 RO Avalon-MM-to-PCI Express Mailbox 4
0x0914 A2P_MAILBOX5 RO Avalon-MM-to-PCI Express Mailbox 5
0x0918 A2P_MAILBOX6 RO Avalon-MM-to-PCI Express Mailbox 6
0x091C A2P_MAILBOX7 RO Avalon-MM-to-PCI Express Mailbox 7
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