Altera PCI Compiler - Manual (Page 279)

Altera Corporation User Guide Version 11.1 7–11
October 2011
Functional Description
Figure 7–6. PCI-Avalon Bridge Block Diagram Managing the PCI Host-Bridge Device Mode
You can customize the PCI Host-Bridge Device mode by specifying a
performance profile. The PCI Host-Bridge Device mode performance
profiles are the same as the PCI Master/Target Peripheral mode.
Performance Profiles
The performance profiles are designed to provide trade-offs between
performance and resource usage, which also provides a deeper level of
system control. Therefore, you are able to customize system features to
suit application requirements. For example, if you need a target-only PCI
system component for a low bandwidth and low latency application,
specify that the targeted Altera device operate in the PCI Target-Only
Peripheral mode and use the Single-Cycle Transfers Only performance
profile.
The PCI-Avalon bridge provides the ability to modify the PCI master and
target performances independently. The PCI target performance setting
applies to all PCI device operating modes, while the PCI master
performance setting applies only to the PCI Master/Target Peripheral
and PCI Host-Bridge Device operating modes.
PCI-Avalon Bridge
PCI Host Bridge Mode
PCI
MegaCore
Function
PCI
Target
Controller
Non-
Prefetchable
Avalon
Master
Prefetchable
Avalon
Master
Control
Register Access
Avalon Slave
Control
Status
Registers
PCI
Prefetchable
Bridge
Logic
PCI
Non-
Prefetchable
Bridge Logic
PCI
Bus
PCI
Master
Controller
Master
Bridge
Logic
PCI Bus
Access
Avalon Slave
Master
Peripheral
Slave
Peripheral
Slave
Peripheral
PCI
Master/
Target
Device
PCI
Bus
Arbiter
PCI
Master/
Target
Device
PCI
Master/
Target
Device
Host
Processor
System
Interconnect
Fabric