Altera Stratix V Avalon-ST - Manual (Page 132)

The SR-IOV processes memory requests, Completions and messages received from the link. It passes
them to the Application Layer unmodified, using the Avalon-ST RX interface. The SR-IOV Bridge does
not maintain any state for requests outstanding on the Master or Target sides. The RX interface delivers
Completion TLPs to the Application Layer in the same order as received from the link. It does not match
Completion TLPs with the outstanding requests from the Application Layer.
The following figure illustrates the SR-IOV Bridge logic and its interfaces to the Stratix V Hard IP for PCI
Express and Application Layer.
Figure 9-4: Block Diagram of the Stratix V Hard IP for PCI Express IP with the SR-IOV Bridge
Request
Processing
Completion
Generation
LMI Interface
Block
Error Message
Generation PF
Registers
VF
Registers
Avalon-ST TX
Multiplexer
Avalon-ST RX
Demultiplexer
BAR Check and UR
Completion Generation
Stratix V
PCI Express
Hard IP Block
PIPE
Interface
LMI
Avalon-ST
TX Interface
Avalon-ST
RX Interface
Stratix V PCI Express SR-IOV Bridge
User
Application
Configuration Block
Control/Status
Interface
Interrupt
Interface
Local
Management
Interface
Avalon-ST
TX Interface
Avalon-ST
RX Interface
UR Completion
Configuration Completion,
Interrupts, and Error Messages
Configuration
Requests
SR-IOV Bridge Logic Details
Soft logic in the SR-IOV Bridge decodes Configuration Space transactions on Avalon-ST interface via
Configuration Bypass mode and forwards them to the internal Configuration Block. The Configuration
Block implements the following logic:
• Processes incoming Configuration Space TLPs and generates Completions
• Includes Configuration Space registers of two Physical Functions and 128 Virtual Functions.
• Generates MSI, MSI-X, and Legacy Interrupts (
INTx Assert and Deassert
)
• Generates error messages for AER
• Multiplexes the following data sources to on the Avalon-ST TX interface:
• Master-side requests and Target-side Completions generated by the Application Layer
• UR Completions from the BAR Check block for Memoroy Read Requests
• Transmits Memory Read and Memory Write received on TX Avalon-ST interface from the Applica‐
tion Layer. The core forwards these requests to the host as is, without any checking for errors. Applica‐
tion Layer logic must make sure the transmitted memory requests satisfy all PCI Express requirements.
9-8 Stratix V Hard IP for PCI Express with Single-Root I/O Virtualization (SR-IOV)
UG-01097_sriov
2014.12.15
Altera Corporation IP Core Architecture
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