Altera CPRI IP Core - Manual (Page 104)

6–6 Chapter 6: Signals
Auxiliary Interface Signals
CPRI MegaCore Function December 2013 Altera Corporation
User Guide
AUX Receiver Signals
Table 6–3 lists the signals on the AUX receiver interface. For additional information
about these signals, refer to “AUX Receiver Module” on page 4–31 .
Table 6–3. AUX Receiver Interface Signals
Signal Direction Bit Description
aux_rx_status_data
[75:0]
Output [75]
cpri_rx_rfp : Synchronization pulse for start of 10 ms radio frame. The
pulse occurs at the start of the radio frame on the CPRI receiver interface.
[74]
cpri_rx_start : Indicates the start of the first basic frame on the AUX
interface, and can be used by an AxC software application to trigger the
AxC-specific resynchronization signal used in the MAP interface
synchronous buffer mode. The
cpri_rx_start signal is asserted at the
offset defined in the CPRI_START_OFFSET_RX register. The count to the
offset starts at the cpri_rx_rfp or cpri_rx_hfp pulse, depending on
values set in the register. Refer to Table 7–39 on page 7–19 . The signal is
asserted for the duration of the basic frame.
[73]
cpri_rx_hfp : Synchronization pulse for start of hyperframe. The pulse
occurs at the start of the hyperframe on the CPRI receiver interface.
[72:61] cpri_rx_bfn : Current radio frame number.
[60:53] cpri_rx_hfn : Current hyperframe number. Value is in the range 0–149.
[52:45]
cpri_rx_x : Index number of the current basic frame in the current
hyperframe. Value is in the range 0–255.
[44:39]
cpri_rx_k : Sample counting K counter. Counts the basic frame position of
the AxC Container Block for mapping IQ samples when map_mode field in
the CPRI_MAP_CONFIG register has value 01 or 10 . This signal is not used
when map_mode value is 00 .
[38:33]
cpri_rx_seq : Index number of the current 32-bit word in the current
basic frame being transmitted on the AUX link.
Depending on the CPRI line rate, this signal has the following range:
■ 614.4 Mbps line rate: range is 0 –3
■ 1228.8 Mbps line rate: range is 0–7
■ 2457.6 Mbps line rate: range is 0–15
■ 3072.2 Mbps line rate: range is 0–19
■ 4915.2 Mbps line rate: 0–31
■ 6144.0 Mbps line rate: 0–39
■ 9830.4 Mbps line rate: 0–63
[32]
cpri_rx_sync_state : When set, indicates that Rx, HFN, and BFN
synchronization have been achieved in CPRI receiver frame
synchronization.
[31:0]
cpri_rx_aux_data : Data transmitted on the AUX link. Data is transmitted
in 32-bit words. Byte [31:24] is transmitted first, and byte [7:0] is
transmitted last.