Altera CPRI IP Core User Manual
Page 161
Appendix B: Implementing CPRI Link Autorate Negotiation
B–5
Autorate Negotiation From 9.8304 Gbps in Arria V GT Variations
December 2013
Altera Corporation
CPRI MegaCore Function
User Guide
lists the frequencies at which you must drive the
usr_clk
and
usr_pma_clk
input clocks in these CPRI IP core variations.
If your CPRI IP core Arria V GT variation is configured with the 9.8304 Gbps CPRI
line rate, it cannot negotiate down to a CPRI line rate of 0.6144 Gbps.
Table B–1. usr_ck and usr_pma_clk Frequencies at Different Target CPRI Line Rates
Target CPRI Line Rate (Gbps)
Frequency (MHz)
usr_clk
usr_pma_clk
9.8304
245.76
122.88
6.144
153.6
76.8
4.9152
122.88
61.44
3.0720
76.8
153.6
2.4576
61.44
122.88
1.2288
30.72
61.44
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