Altera CPRI IP Core User Manual
Page 132
7–16
Chapter 7: Software Interface
MAP Interface and AUX Interface Configuration Registers
CPRI MegaCore Function
December 2013
Altera Corporation
User Guide
map_15bit_mode
[4]
RW
15-bit sample width. Values are:
0: 2 × 16-bit sample width
1: 2× 15-bit sample width
The Altera CPRI IP core does not support the
map_15bit_mode
value of 0 in the Advanced 3 mapping mode. For more
information, refer to
Appendix D, Advanced AxC Mapping Modes
1’h0
map_tx_sync_mode
[3]
RW
Tx MAP synchronization mode if Enable MAP interface
synchronization with core clock is turned off. Values are:
0: FIFO mode
1: Synchronous buffer mode
1’h0
map_rx_sync_mode
[2]
RW
Rx MAP synchronization mode if Enable MAP interface
synchronization with core clock is turned off. Values are:
0: FIFO mode
1: Synchronous buffer mode
1’h0
map_mode
[1:0]
RW/RO
AxC mapping mode. If you select All as the value for the Mapping
mode(s) parameter in the CPRI IP core, this register field
determines the current AxC mapping mode. If you select any
other value for the Mapping mode(s) parameter, this register field
is ignored (Read-only).
Register field values are:
2’h0
00: Basic mapping scheme (UMTS/LTE standard in which all
MAP interfaces use the same sample rate, as described in
the CPRI V4.2 Specification sections 4.2.7.2.2 and
4.2.7.2.3).
01: CPRI V4.2 Specification section 4.2.7.2.5:
Method 1: IQ sample based.
New Method 1 implementation in the Quartus II software
v11.1 release.
10: CPRI V4.2 Specification section 4.2.7.2.7:
Method 3: Backward compatible.
11: CPRI V4.2 Specification section 4.2.7.2.5:
Method 1: IQ sample based.
This implementation is available in all pre-11.1 releases
of the Altera CPRI IP core as advanced mapping mode
2’b01.
Values 01, 10, and 11 indicate advanced AxC mapping modes in
which each MAP interface can implement a different channel rate
and radio standard.
Table 7–31. CPRI_MAP_CONFIG—CPRI Mapping Features Configuration—Offset: 0x100 (Part 2 of 2)
Field
Bits
Access
Function
Default
Table 7–32. CPRI_MAP_CNT_CONFIG—Basic UMTS/LTE Mapping Configuration—Offset: 0x104
(Part 1 of 2)
Field
Bits
Access
Function
Default
RSRV
[31:13]
UR0
Reserved.
19’h0
map_ac
[12:8]
RW
Number of active data channels (antenna-carrier interfaces).
5’h0
RSRV
[7:5]
UR0
Reserved.
3’h0