Altera CPRI IP Core - Manual (Page 122)

7–6 Chapter 7: Software Interface
CPRI Protocol Interface Registers
CPRI MegaCore Function December 2013 Altera Corporation
User Guide
Table 7–8. CPRI_RX_CTRL—CPRI Received Control Word—Offset: 0x10
Field Bits Access Function Default
rx_control_data [31:0] RW
Most recent received CPRI control word 32-bit section from
CPRI hyperframe position Z.x, where x is the index in the
cpri_ctrl_index field of the CPRI_CTRL_INDEX register. The
cpri_ctrl_position field of the CPRI_CTRL_INDEX register
indicates whether this is the first, second, third, or fourth such
32-bit section.
32'h0
Table 7–9. CPRI_TX_CTRL—CPRI Transmit Control Word—Offset: 0x14
Field Bits Access Function Default
tx_control_data [31:0] RW
CPRI control word 32-bit section to be transmitted in CPRI
hyperframe position Z.x, where x is the index in the
cpri_ctrl_index field of the CPRI_CTRL_INDEX register.
The cpri_ctrl_position field of the CPRI_CTRL_INDEX
register indicates whether this is the first, second, third, or
fourth such 32-bit section.
32'h0
Table 7–10. CPRI_LCV—CPRI Line Code Violation Counter—Offset: 0x18
Field Bits Access Function Default
RSRV [31:8] UR0 Reserved. 24'h0
cpri_lcv [7:0] RO
Number of line code violations (LCVs) detected in the 8B/10B
decoding block in the transceiver. Enables CPRI link
debugging. This register saturates at the value 255; after it
reaches 255, it maintains this value until reset.
This counter is not used to determine whether the N_LCV
threshold (
Table 7–23 on page 7–12 ) is reached, because it
includes LCVs that occur during initialization—before T_LCV
(
Table 7–24 on page 7–12 ) is reached—and because it
saturates.
8’h0
Table 7–11. CPRI_BFN—CPRI Recovered Radio Frame Counter—Offset: 0x1C
Field Bits Access Function Default
RSRV [31:12] UR0 Reserved. 20'h0
bfn [11:0] RO
Current BFN (node B radio frame number) number. Value
obtained from BFN alignment state machine.
12’h0
Table 7–12. CPRI_HW_RESET—Hardware Reset From Control Word—Offset: 0x20 (Part 1 of 2)
Field Bits Access Function Default
RSRV [31:8] UR0 Reserved. 24'h0
reset_gen_done_hold [7] RC Hold reset_done . 1’h0
reset_gen_done [6] RO
Indicates that a reset request or acknowledgement has been
successfully sent on the CPRI link by the CPRI transmitter.
1'h0
reset_detect_hold [5] RC (1) Hold reset_detect . 1'h0