IPR-PCIE/8 Altera, IPR-PCIE/8 Datasheet - Page 68

• 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
3–30
PCI Express Compiler User Guide
f
developed. Stratix II GX devices were designed to meet the PCI Express
protocol and do not have this issue. However, a Stratix II GX is one of the
PCI Express devices that is unable to detect Stratix GX.
The resulting design impact is that Stratix GX will not interoperate with
some other PCI Express devices. However, you can workaround this
issue by doing either of the following:
■
■
OpenCore Plus Time-Out Behavior
OpenCore
modes of operation:
■
■
All MegaCore functions in a device time out simultaneously when the
most restrictive evaluation time is reached. If there is more than one
MegaCore function in a design, a specific MegaCore function’s time-out
behavior may be masked by the time-out behavior of the other MegaCore
functions.
1
When the hardware evaluation time expires, the MegaCore function does
the following:
1.
2.
For more information on OpenCore Plus hardware evaluation, see
“OpenCore Plus Evaluation” on page 1–6
Evaluation of Megafunctions.
If possible, force the other PCI Express device to ignore the results of
the Rx Detect protocol and try to train the link anyway.
Migrate Stratix GX PCI Express designs to Stratix II GX.
Untethered—the design runs for a limited time
Tethered—requires a connection between your board and the host
computer. If tethered mode is supported by all MegaCore functions
in a design, the device can operate for a longer time or indefinitely
The link training and status state machine are forced to the detect
quiet state and held there. This disables the PCI Express link
preventing additional data transfer.
The PCI Express capability registers in the configuration space are
held in a reset state.
PCI Express Compiler Version 6.1
For MegaCore functions, the untethered time out is 1 hour; the
tethered time-out value is indefinite.
®
Plus hardware evaluation can support the following two
and AN 320: OpenCore Plus
Altera Corporation
December 2006