IP-CPRI Altera, IP-CPRI Datasheet - Page 47

• 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 4: Functional Description
CPRI MAP Interface Module
December 2010 Altera Corporation
MAP Interface Mapping Modes
This section contains the following topics:
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■
■
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The map_mode field of the CPRI_MAP_CONFIG register determines the mapping mode
implemented by your CPRI MegaCore function.
Basic AxC Mapping Mode
In the basic UMTS/LE standard mapping mode, implemented when map_mode has
value 2’b00, all of the AxC interfaces use the same sample rate and sample width. The
CPRI MegaCore function supports sample rates of 3.84 × 10
(3.84 × 10
15 bits and 16 bits. The uplink and downlink sample rates are identical.
In this mode, the map_ac field of the CPRI_MAP_CNT_CONFIG register specifies the
number of active data channels, that is, those that have a corresponding AxC
container in the IQ data block of each basic frame. This number must be less than or
equal to the N_MAP value you selected for Number of antenna/carrier interfaces in
the parameter editor, which is the number of channels configured in the CPRI
MegaCore function instance. The map_n_ac field of the CPRI_MAP_CNT_CONFIG register
holds the oversampling factor for the data channels. This value is an integer from 1 to
8. The sample rate—number of samples per second—is the product of 3.84 × 10
the oversampling factor.
MAP Interface Mapping Modes
CPRI MAP Receiver Interface
CPRI MAP Transmitter Interface
PRBS Generation and Validation
6
× 8) samples per second, in increments of 3.84 × 10
CPRI MegaCore Function User Guide
6
through 30.72 × 10
6
, and sample widths of
6
6
and
4–23