Altera CPRI IP Core - Manual (Page 105)

Chapter 6: Signals 6–7
Auxiliary Interface Signals
December 2013 Altera Corporation CPRI MegaCore Function
User Guide
AUX Transmitter Signals
Table 6–4 lists the signals on the AUX transmitter interface. For additional
information about these signals, refer to “AUX Transmitter Module” on page 4–34 .
Table 6–4. AUX Transmitter Interface Signals (Part 1 of 2)
Signal Direction Bits Description
aux_tx_status_data
[43:0]
Output
[43]
cpri_tx_error : Indicates that in the previous cpri_clkout cycle, the
cpri_tx_aux_mask[31:0] mask bits were not deasserted during K28.5
character insertion in the outgoing CPRI frame (which occurs when
Z=X=0).
[42:37]
cpri_tx_seq : Index number of the current 32-bit word in the
two-cycle-offset basic frame to be received 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
[36:31]
cpri_tx_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 .
[30:23]
cpri_tx_x : Index number of the current basic frame in the current
hyperframe. Value is in the range 0–255.
[22:15] cpri_tx_hfn : Current hyperframe number. Value is in the range 0–149.
[14:3] cpri_tx_bfn : Current radio frame number.
[2]
cpri_tx_hfp : Synchronization pulse for start of hyperframe. The pulse
occurs at the start of the hyperframe on the CPRI transmitter interface.
[1]
cpri_tx_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 MAP synchronous buffer
mode. The
cpri_tx_start signal is asserted at the offset defined in the
CPRI_START_OFFSET_TX register. The count to the offset starts at the
cpri_tx_rfp or cpri_tx_hfp pulse, depending on values set in the
register. Refer to Table 7–40 on page 7–20 . The signal is asserted for the
duration of the basic frame.
[0]
cpri_tx_rfp : Synchronization pulse for start of 10 ms radio frame. The
pulse occurs at the start of the radio frame on the CPRI transmitter
interface.