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7–52 User Guide Version 11.1 Altera Corporation
PCI Compiler October 2011
Control & Status Registers
Avalon-MM interrupts can also be enabled for all of the conditions in bits
31:0. However, only one of the Avalon-MM or PCI interrupts (not both)
should be enabled for any given bit. There is typically a single process in
either the PCI or Avalon-MM domain that is responsible for handling the
condition reported by the interrupt.
PCI Mailbox Register Access
The PCI bus typically needs write access to a set of PCI-to-Avalon mailbox
registers and read-only access to a set of Avalon-to-PCI mailbox registers.
Table 7–1 on page 7–5 lists the specific number (1 or 8) of available
mailbox registers.
The PCI-to-Avalon mailbox registers are writable at the addresses shown
in Table 720. Writing to one of these registers causes the corresponding
bit in the Avalon-MM interrupt status register to be set to 1.
Table 7–19. PCI Interrupt Enable Register – Address: 0x0050
Bit Name
Access
Mode
Description
31:0 One-to-one enable
mapping to the PCI
interrupt status register
bits
RW When set to 1, indicates that the associated bit in the PCI
interrupt status register will cause the PCI interrupt line
(
intan) to be asserted if not disabled by the PCI command
register.
Only bits implemented in the PCI interrupt status register are
implemented in the enable register. Unimplemented bits cannot
be set to 1.
Table 7–20. PCI-to-Avalon Mailbox Registers – Address Range:
0x0800-0x081F
Address Name Access Description
0x0800
P2A_MAILBOX0
RW PCI-to-Avalon mailbox 0.
0x0804
P2A_MAILBOX1
RW PCI-to-Avalon mailbox 1.
0x0808
P2A_MAILBOX2
RW PCI-to-Avalon mailbox 2.
0x080C
P2A_MAILBOX3
RW PCI-to-Avalon mailbox 3.
0x0810
P2A_MAILBOX4
RW PCI-to-Avalon mailbox 4.
0x0814
P2A_MAILBOX5
RW PCI-to-Avalon mailbox 5.
0x0818
P2A_MAILBOX6
RW PCI-to-Avalon mailbox 6.
0x081C
P2A_MAILBOX7
RW PCI-to-Avalon mailbox 7.
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