Altera CPRI v6.0 MegaCore Function - Manual (Page 45)

Figure 3-8: AUX TX Interface Timing Diagram with Four Auxiliary Latency Cycles
Expected behavior on the AUX TX interface of a CPRI v6.0 IP core running at 0.6144 Gbps. Illustrates the
effect of setting the Auxiliary latency cycle(s) parameter to the value of four.
clock cycles write latency
4095 0
0
3
255 1
149 0
2 0 1 2 3 0 1 2
X Data #1 Data #2 Data #3 Data #4 Data #5
Data #5
X Mask #1 Mask #2 Mask #3 Mask #4 Mask #5
0 1 2 3 0 0 1 2 3
X Data #1 Data #2 Data #3 Data #4
cpri_clkout
aux_tx_rfp
aux_tx_bfn
aux_tx_hfp
aux_tx_hfn
aux_tx_x
aux_tx_seq
aux_tx_data
aux_tx_mask
Sequence Nnumber
at actual CPRI frame
Actual frame data
Default one cpri_clkout cycle
delay to write
Default delay + 4
Auxiliary latency cycle(s) == 1:
UG-01156
2014.08.18
AUX Interface Signals 3-15
Functional Description Altera Corporation
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