IP-CPRI Altera, IP-CPRI Datasheet - Page 50

• 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

4–26
CPRI MegaCore Function User Guide
Table 4–5. Maximum Number of Active Data Channels in 15-Bit Mode
Altera recommends that you use sample rates that are integer multiples of 3.84 MHz.
However, for implementing the WiMAX protocol, Altera recommends that you use
the exact WiMAX input sample rates. WiMAX applications require use of the
synchronous buffer mode. In 16-bit mode, the total number of bits in all the AxC
containers in a basic frame is
In 15-bit mode, the total number of significant bits in all the AxC containers in a basic
frame is
This value must be no larger than the number of bits in the IQ data block, shown in
square brackets in the leftmost column of
of CPRI line rate, map_n_ac value, and map_ac value requires more data bits than fit in
the IQ data block, the data for the first active data channels is transferred correctly, but
the data for data channels beyond the number indicated in
not transferred correctly.
The following CPRI MegaCore function registers are ignored in basic mapping mode:
■
■
■
■
Advanced AxC Mapping Modes
In the advanced AxC mapping modes, implemented when map_mode has value 2’b01
or 2b’10, different data channels can use different sample rates, and the sample rates
need not be integer multiples of 3.84 MHz. However, all data channels use the same
sample width.
Data Channel Bandwidth
LTE (MHz)
Sample Rate
(10
Note to
(1) The maximum number of data channels supported by the CPRI MegaCore function is 24. The numbers in the table
2 × 16 × map_n_ac × map_ac
2 × 15 × map_n_ac × map_ac
CPRI_MAP_TBL_CONFIG register
CPRI_MAP_TBL_INDEX register
CPRI_MAP_TBL_RX register
CPRI_MAP_TBL_TX register
6
that are larger than 24 are hypothetical; the CPRI MegaCore function cannot implement them.
Sample/Sec)
Table
614.4 [120]
1228.8 [240]
2456.7 [480]
3072 [600]
4915.2 [960]
6144 [1200]
4–5:
32
40
3.84
2.5
16
20
(Table 6–33 on page
(Table 6–34 on page
4
8
(1)
(1)
(Table 6–32 on page
(Table 6–31 on page
7.68
10
16
20
Table 4–4
5
2
4
8
6–15)
6–15)
and
15.36
6–14)
10
10
6–14)
1
2
4
5
8
Table
Table 4–4
December 2010 Altera Corporation
Chapter 4: Functional Description
4–5. If the combination
23.04
CPRI MAP Interface Module
15
—
1
2
3
5
6
or
Table 4–5
30.72
20
—
1
2
2
4
5
is