IP-CPRI Altera, IP-CPRI Datasheet - Page 47
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IP-CPRI
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
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Chapter 4: Functional Description
CPRI MAP Interface Module
May 2011 Altera Corporation
MAP Interface Mapping Modes
This section contains the following topics:
■
■
■
■
The map_mode field of the CPRI_MAP_CONFIG register determines the mapping mode
implemented by your CPRI IP core.
Basic AxC Mapping Mode
In the basic UMTS/LTE 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 IP core supports sample rates of 3.84 × 10
samples per second, in increments of 3.84 × 10
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 IP core
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
oversampling factor.
MAP Interface Mapping Modes
CPRI MAP Receiver Interface
CPRI MAP Transmitter Interface
PRBS Generation and Validation
6
, and sample widths of 15 bits and
6
through 30.72 × 10
CPRI MegaCore Function User Guide
6
(3.84 × 10
6
and the
6
× 8)
4–23
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