IP-CPRI Altera, IP-CPRI Datasheet - Page 23

• Manufacturer Part Number: IP-CPRI
• Description: IP CORE - Common Public Radio Interface (CPRI)
• Manufacturer: Altera

Specifications of IP-CPRI

• Software Application: IP CORE, Interface And Protocols, HIGH SPEED
• Supported Families: Arria II GX, Cyclone IV GX, HardCopy IV, Stratix IV
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Chapter 3: Parameter Settings
Enable Auto-Rate Negotiation
Enable Auto-Rate Negotiation
Include MAC Block
December 2010 Altera Corporation
Auto-rate negotiation is the process of stepping down from a higher target CPRI line
rate to a lower target CPRI line rate if you are unable to establish a link at the higher
rate. If your CPRI MegaCore function has auto-rate negotiation enabled, and you
program it to step down from its highest target CPRI line rate to its lower target CPRI
line rates when it does not achieve frame synchronization, your MegaCore function
achieves frame synchronization at the highest possible CPRI line rate in its range of
potential line rates, depending on the capability of its CPRI partner.
For information about the auto-rate negotiation feature, refer to
Negotiation” on page 4–21
Negotiation.
Turn on the Enable auto-rate negotiation parameter to specify that your CPRI
MegaCore function supports auto-rate negotiation. By default, this parameter is
turned off.
Turn on the Include MAC block parameter to specify that your CPRI MegaCore
function includes an internal Ethernet MAC block. By default, this parameter is not
turned on. If this parameter is not turned on, the CPRI MegaCore function
implements the MII interface to your own external Ethernet MAC, instead.
For information about the internal Ethernet MAC block, refer to
Fast Control and Management Channel (Ethernet)” on page
For information about the MII interface, refer to
Block” on page
4–52.
and
Appendix B, Implementing CPRI Link Auto-Rate
“MII Interface to an External Ethernet
CPRI MegaCore Function User Guide
4–49.
“Auto-Rate
“Data Link Layer for
3–3