Altera PCI Compiler User Manual
Page 304
7–36
User Guide Version 11.1
Altera Corporation
PCI Compiler
October 2011
PCI Master Operation
Figure 7–10. Avalon-to-PCI Address Translation
Address Translation Table Size (refer to
) selections determine both the number of entries in the
Avalon-to-PCI address translation table, and the number of bits that are
passed through the transaction table unchanged.
Each entry in the address translation table also has two address space
indication bits, which specify the type of address space being mapped. If
the type of address space being mapped is memory, the bits also indicate
Avalon Address
PCI Address
High
Low
N = Number of Pass Through Bits
M = Number of Avalon Address Bits
P = Number of PCI Address Bits
Q = Number of Translation Table Entries
Sp = Space Indication for Each Entry
Low Address Bits Unchanged
Avalon to PCI Address
Translation Table
(Q Entries by P-N Bits wide)
PCI Address from Table Entry
Used as High PCI Address Bits
Space Indication
Table Updates via
Control Register Port
High Avalon Address
Bits Index Table
PCI Address 0
Sp0
PCI Address 1
Sp1
PCI Address Q-1
SpQ-1
0
N-1
M-1
N
High
Low
0
P-1
N N-1