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
Data Link Layer Parameters
Data Link Layer Parameters
Application Layer Parameters
May 2011 Altera Corporation
Include MAC Block
Number of Antenna-Carrier Interfaces
1
Turn on the Include MAC block parameter to specify that your CPRI IP core includes
an internal Ethernet MAC block. By default, this parameter is not turned on. If this
parameter is not turned on, the CPRI IP core implements the MII interface to your
own external Ethernet MAC, instead.
If this parameter is not turned on in your CPRI IP core, your application cannot access
the Ethernet or HDLC registers. Attempts to access these registers read zeroes and do
not write successfully, as for a reserved register address.
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
The Number of antenna/carrier interfaces parameter specifies the number of
antenna-carrier interfaces, or data channels, in your CPRI IP core. The supported
values are 0 to 24. Set this parameter to the maximum number of data channels you
expect your CPRI IP core to use at the same time.
If you set this parameter to zero, your CPRI IP core does not implement the CPRI
MAP interface. For example, you might use this option if your CPRI IP core passes IQ
data samples through the AUX interface to an external custom mapping function that
you provide.
You can specify in software that some of the antenna-carrier interfaces that you
configure in your CPRI IP core are not active. This feature allows you to change the
number of active and enabled data channels dynamically.
The combination of CPRI IP core line rate, sampling width, and sampling rate restricts
the number of active antenna-carrier interfaces your CPRI IP core can support. For
example, if your CPRI IP core operates at line rate 3.072 Gbps, it can support as many
as 20 active antenna-carrier interfaces, but if your CPRI IP core operates at line rate
1.2288 Gbps, it can support a maximum of eight active antenna-carrier interfaces. For
details, refer to
The software configuration feature allows you to modify the number of active
antenna-carrier interfaces; if you modify this number, you must keep in mind the
restrictions for your current CPRI line rate. Otherwise, data is dropped in the
mapping to and from the individual antenna-carrier interfaces.
Table 4–4
4–58.
and
Table 4–5 on page
“MII Interface to an External Ethernet
4–26.
CPRI MegaCore Function User Guide
4–54.
“Data Link Layer for
3–3