IP-CPRI Altera, IP-CPRI Datasheet - Page 93

• Manufacturer Part Number: IP-CPRI
• Description: IP CORE - Common Public Radio Interface (CPRI)
• Manufacturer: Altera

Specifications of IP-CPRI

• Software Application: IP CORE, Interface And Protocols, HIGH SPEED
• Supported Families: Arria II GX, Cyclone IV GX, HardCopy IV, Stratix IV
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Chapter 5: Signals
Auxiliary Interface Signals
Table 5–13. AUX Transmitter Interface Signals (Part 2 of 2)
December 2010 Altera Corporation
aux_tx_mask_data
[64:0]
Signal
Input
Direction
[64]
[63:32]
[31:0]
Bits
cpri_tx_sync_rfp: Synchronization input used in REC master to
control the start of a new 10 ms radio frame. Asserting this signal
resets the frame synchronization machine. Drive this signal as a pulse
asserted every 10 ms synchronous to the cpri_clkout clock. The
CPRI MegaCore function uses the rising edge of the pulse for
synchronization and ignores the duration and falling edge of the pulse.
The number of cpri_clkout clock cycles between pulses (from rising
edge to rising edge) must be exactly 256 × 4 × 150 ×
CPRI line rate/644 Mbps.
cpri_tx_aux_data: Data received on the AUX link, aligned with
cpri_tx_seq with a delay of two cpri_clkout cycles. Data is
transmitted in 32-bit words. Byte [31:24] is transmitted first, and byte
[7:0] is transmitted last.
cpri_tx_aux_mask: Bit mask for insertion of data from
cpri_tx_aux_data in the outgoing CPRI frame. Assertion of a bit in
this mask overrides insertion of data to the corresponding bit in the
outgoing CPRI frame from any other source. Therefore, the mask bits
must be deasserted during K28.5 character insertion in the outgoing
CPRI frame, which occurs when Z=X=0. If you do not deassert the mask
bits during K28.5 character insertion in the outgoing CPRI frame, the
cpri_tx_error output signal is asserted in the following
cpri_clkout cycle.
Description
CPRI MegaCore Function User Guide
5–13