Motorola PowerQUICC II MPC8280 Series Reference Manual page 348

Address Map
Transactions initiated by the DMA controller or message unit fall into one of the following
cases:
• If the transaction address is within one of the outbound PCI translation windows, the
transaction is sent to the PCI bus with address translation.
• If the transaction address is not within a PCI translation window, the transaction is
sent to the core side of the PCI bridge with no address translation.
An address decode flow chart for transactions from the DMA controller or message unit to
the PCI bridge is shown in Figure 9-13.
DMA/MU mastered
Issue transaction
Figure 9-13. Address Decode Flow Chart for Embedded Utilities
(DMA, Message Unit) Mastered Transactions
Example address mappings of these different types of transactions are shown in
Figure 9-14. Note that the translation mechanism shown is an example only; the address
translation, as well as the memory and I/O destinations, can be programmed independently
for each address translation window.
9-26
Freescale Semiconductor, Inc.
transaction
Hit
No
Outbound ATU
?
Yes
with translated
address to PCI
MPC8280 PowerQUICC II Family Reference Manual
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Issue transaction
with un-translated
address to 60x bus
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