IPR-PCIE/8 Altera, IPR-PCIE/8 Datasheet - Page 40

• Manufacturer Part Number: IPR-PCIE/8
• Description: IP CORE Renewal Of IP-PCIE/8
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IPR-PCIE/8

• Software Application: IP CORE, Interface And Protocols, PCI
• Supported Families: Arria GX, Cyclone II, HardCopy II, Stratix II
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: PCI Express Compiler, x8 Link Width
• License: Renewal License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Functional Description
3–2
PCI Express Compiler User Guide
f
■
Endpoint Types
The MegaCore function can implement either a native PCI Express
endpoint or a legacy endpoint. Altera recommends using native PCI
Express endpoints for new applications; they support memory space read
and write transactions only. Legacy endpoints provide compatibility with
existing applications and can support I/O space read and write
transactions.
See the PCI Express specification endpoint description for further
information on the differences between native PCI Express and legacy
endpoints.
Transaction Layer
The transaction layer lies between the application layer and the data link
layer. It generates and receives transaction layer packets.
illustrates the transaction layer of a component with two initialized
virtual channels. The transaction layer contains three general subblocks:
the transmit data path, the configuration space, and the receive data path,
which are shown with vertical braces in
●
●
Physical Layer—The physical layer initializes the speed, lane
numbering, and lane width of the PCI Express link according to
packets received from the link and directives received from higher
layers.
PCI Express Compiler Version 6.1
Manages the retry buffer and retry mechanism according to
received ACK/NAK data link layer packets
Initializes the flow control mechanism for data link layer
packets and routes flow control credits to and from the
transaction layer
Figure
3–2.
Altera Corporation
Figure 3–2
December 2006