Altera CPRI IP Core - Manual (Page 127)

Chapter 7: Software Interface 7–11
CPRI Protocol Interface Registers
December 2013 Altera Corporation CPRI MegaCore Function
User Guide
Table 7–21. AUTO_RATE_CONFIG—Autorate Negotiation Register—Offset: 0x48
Field Bits Access Function Default
RSRV [31:6] UR0 Reserved. 28’h0
i_datarate_en [5] RO
Indicates that autorate negotiation is enabled. (Value is
1’b0 if autorate negotiation is not enabled; 1’b1 if
autorate negotiation is enabled, in the CPRI parameter
editor). Refer to
Figure B–1 and Figure B–2 for an
illustration of the autorate negotiation logic in the CPRI
IP core and the autorate negotiation logic you must add
to your design outside the CPRI IP core.
As specified in
CPRI parameter
editor
i_datarate_set [4:0] RW
CPRI line rate to be used in next attempt to achieve
frame synchronization. You set the line rate in your
implementation of the autorate negotiation hardware
and software outside the CPRI IP core. Refer to
Appendix B, Implementing CPRI Link Autorate
Negotiation
, for information about how to use the
autorate negotiation logic implemented in the CPRI IP
core.
Encode the CPRI line rate in this field with the following
values:
00001: 614.4 Mbps
00010: 1228.8 Mbps
00100: 2457.6 Mbps
00101: 3072.0 Mbps
01000: 4915.0 Mbps (1)
01010: 6144.0 Mbps (1)
10000: 9830.4 Mbps (2)
4’h0
Notes to Table 7–21 :
(1) This value is not valid for CPRI IP core variations that target a Cyclone IV GX device. This value is valid for CPRI MegaCore variations that target
an Arria II GX device only if that device is an I3 speed grade device.
(2) This value is valid only for CPRI IP core variations that target a device that supports this CPRI line rate.
Table 7–22. CPRI_INTR_PEND—Interrupt Pending Status—Offset: 0x4C (Part 1 of 2)
Field Bits Access Function Default
RSRV [31:6] UR0 Reserved. 26’h0
los_lcv_pending [5] RW
Indicates an los_lcv interrupt is pending (the interrupt
occurred but is not yet serviced).
1’h0
RSRV [4:2] UR0 Reserved. 4’h0