Altera CPRI v6.0 MegaCore Function - Manual (Page 39)

Figure 3-4: Start-Up Sequence State Machine Timing Diagram
000 111 110 101 001 011
000 001 011 111 110
cpri_clkout
state_startup_sequence
state_l1_sync
nego_bitrate_complete
nego_vss_complete
Bit Rate
Negotiation
Protocol Version
Negotiation
Control and Management Rate
Negotiation
VSS and Interface
Negotiation
Operational
Mode
AUX Interface
The CPRI v6.0 IP core auxiliary (AUX) interface provides direct access to the CPRI 10 ms radio frame,
including I/Q data and control words. You can use this interface to support your specific application. For
example, the AUX interface allows you to implement custom I/Q sample widths and custom mapping
schemes.
The AUX interface also enables multi-hop routing applications and provides timing reference informa‐
tion for transmitted and received frames. Using this interface, you can load I/Q data in a precise location
in the precise CPRI basic frame you target.
The AUX interface allows you to connect CPRI v6.0 IP core instances and other system components
together by supporting a direct connection to a user-defined routing layer or custom mapping block. You
implement this routing layer, which is not defined in the CPRI V6.0 Specification, outside the CPRI v6.0
IP core. The AUX interface supports the transmission and reception of I/Q data and timing information
between an RE slave and an RE master, allowing you to define a custom routing layer that enables daisy-
chain configurations of RE master and slave ports. Your custom routing layer determines the I/Q sample
data to pass on to other REs to support multi-hop network configurations and custom mapping
algorithms.
If you turn on Enable auxiliary interface in the CPRI v6.0 parameter editor, your IP core includes this
interface.
UG-01156
2014.08.18
AUX Interface 3-9
Functional Description Altera Corporation
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