Altera CPRI IP Core - Manual (Page 128)

7–12 Chapter 7: Software Interface
CPRI Protocol Interface Registers
CPRI MegaCore Function December 2013 Altera Corporation
User Guide
hw_reset_pending [1] RW
Indicates a hw_reset interrupt is pending (the interrupt
occurred but is not yet serviced).
In an RE slave, this bit is set when a reset request is detected
in incoming CPRI communication at Z.130.0, but neither the
reset_gen_en bit nor the reset_hw_en bit in the
CPRI_HW_RESET register is set (so that a reset acknowledge
cannot be sent to the RE master), or when the CPRI RE slave
sends a reset acknowledge on the outgoing CPRI link at
Z.130.0.
In a master, this bit is set when a reset acknowledge is
received on the incoming CPRI link at Z.130.0.
Software can count assertions of this bit to confirm the reset
bit in Z.130.0 was asserted in ten consecutive hyperframes to
complete a CPRI-compliant reset acknowledge.
Note that when a reset request is detected in incoming CPRI
communication, and the
reset_hw_en bit in the
CPRI_HW_RESET register is set, the user must assert the
hw_reset_assert input signal to the CPRI RE slave, to force
it to send a reset acknowledge by setting the reset bit in
outgoing CPRI communication at Z.130.0. After the reset bit is
sent on the CPRI link,
hw_reset_pending is asserted.
1’h1
RSRV [0] UR0 Reserved. 1’h0
Table 7–22. CPRI_INTR_PEND—Interrupt Pending Status—Offset: 0x4C (Part 2 of 2)
Field Bits Access Function Default
Table 7–23. CPRI_N_LCV—LCV Threshold—Offset: 0x50
Field Bits Access Function Default
N_LCV [31:0] RW
The number of LCVs that triggers the assertion of the
cpri_rx_los signal.
32’h0
Table 7–24. CPRI_T_LCV—LCV Test Period—Offset: 0x54
Field Bits Access Function Default
T_LCV [31:0] RW
The number of bytes in the initialization period during which
we do not yet count LCVs toward assertion of the
cpri_rx_los signal.
32d’614400
Table 7–25. CPRI_TX_PROT_VER— Tx Protocol Version —Offset: 0x58
Field Bits Access Function Default
RSRV [31:8] UR0 Reserved. 24’h0
tx_prot_version [7:0] RW
Transmit protocol version to be mapped to Z.2.0 to indicate
whether or not the current hyperframe transmission is
scrambled. The value 1 indicates it is not scrambled and the
value 2 indicates it is scrambled.
8’h01