Achronix Speedster22i PCIe - Manual (Page 6)

UG030, April 26, 2013 6
Introduction
The Achronix PCI Express (PCIe) hard core provides a flexible and high-performance
Transaction Layer Interface to the PCIe Bus for the Speedster22i device. The core implements all
three layers (Physical, Data Link, and Transaction) defined by the PCIe standard, as well as a
high-performance DMA interface to facilitate efficient data transfer between the PCIe Bus and
user logic. The core is available in numerous configurations including x16, x8, x4, x2, and x1
Lanes.
It is recommended to use the Achronix Cad Environment (ACE) PCIe Configuration GUI to
implement the core as per the desired configuration (see
Appendix A for additional details).
The following protocol features are offered:

PCI Express Base Specification Revision 3.0 version 1.0 compliant
o Backward compatible with PCI Express 2.1/2.0/1.1/1.0a

x16, x8, x4, x2, or x1 PCI Express Lanes

8.0GT/s, 5.0 GT/s, and 2.5 GT/s line rate support

Comprehensive application support:
o Endpoint
o Root Port
o Endpoint/Root Port
o Upstream Switch Port
o Downstream Switch Port
o Bifurcation options
o Cross-link support

PIPE-Compatible PHY interface for easy connection to PIPE PHY

ECC RAM and Parity Data Path Protection option

Support for Autonomous and Software-Controlled Equalization

Flexible Equalization methods (Algorithm, Preset, User-Table)

Transaction Layer Bypass and Partial Transaction Layer core interface options

Available in four Core Data Widths and five lane widths for maximum flexibility in
supporting a wide spectrum of silicon devices with differing capabilities
o 32-bit (x1, x2, x4)
o 64-bit (x2, x4, x8)
o 128-bit (x4, x8, x16)

Supports Lane Reversal, Up-configure, Down-configure, Autonomous Link Width and
Speed

Implements Type 0 Configuration Registers in Endpoint Mode

Implements Type 1 Configuration Registers in Root Port and Switch Modes
o Complete Switch and Root Port Configuration Register implementation

Supports user expansion of Configuration Space

Easy to use