Altera CPRI IP Core - Manual (Page 64)

4–32 Chapter 4: Functional Description
Auxiliary Interface
CPRI MegaCore Function December 2013 Altera Corporation
User Guide
Figure 4–17 shows the relationship between the synchronization pulses and numbers.
The AUX receiver presents data on the AUX interface in fixed 32-bit words. The
mapping to 32-bit words depends on the CPRI IP core line rate.
Figure 4–18 shows
how the data received from the CPRI protocol interface module is mapped to the AUX
Avalon-ST 32-bit interface.
Figure 4–17. Synchronization Pulses and Numbers on the AUX Interfaces
cpri_{rx,tx}_rfp
cpri_{rx,tx}_bfn
cpri_{rx,tx}_hfp
cpri_{rx,tx}_hfn
cpri_{rx,tx}_x
cpri_{rx,tx}_seq 0 1 ... NUM_SEQ - 1
2 ...
... 2 1 0
255
149
1 0
n n + 1 n + 2
Hyperframe
Radio Frame (10 ms)
Basic Frame
Figure 4–18. AUX Interface Data at Different CPRI Line Rates (Part 1 of 3)
614.4 Mbps
Line Rate:
Sequence number on AUX interface
0 1 2 3
[31:24]: #Z.X.0.0 (1) #Z.X.4.0 #Z.X.8.0 #Z.X.12.0
[23:16]: #Z.X.1.0 #Z.X.5.0 #Z.X.9.0 #Z.X.13.0
[15:8]: #Z.X.2.0 #Z.X.6.0 #Z.X.10.0 #Z.X.14.0
[7:0]: #Z.X.3.0 #Z.X.7.0 #Z.X.11.0 #Z.X.15.0