Altera CPRI v6.0 MegaCore Function - Manual (Page 105)

Bits Field Name Type Value on
Reset
Description
1:0
loop_
forward
RW 2'b0 Testing forward loopback mode. If you turn on Enable
transceiver PMA forward loopback path (Tx to Rx) or Enable
forward loopback path (Tx to Rx) in the CPRI v6.0 parameter
editor, this register field specifies the loopback path that is
currently active. If you do not turn on either of these
parameters, you should leave this register field at its default
value of 2'b0.
This field has the following valid values:
• 2'b00: No loopback.
• 2'b01: Transceiver PMA loopback path is active. This path
does not exercise the transceiver PCS. This option is
available only if you turn on Enable transceiver PMA
forward loopback path (Tx to Rx).
• 2'b10: Active loopback path includes extended delay
measurement logic but does not exercise the transceiver.
This option is available only if you turn on Enable forward
loopback path (Tx to Rx).
• 2'b11: Active loopback path includes framing and deframing
logic, but does not exercise the extended delay measurement
logic and does not exercise the transceiver. This option is
available only if you turn on Enable forward loopback path
(Tx to Rx).
Related Information
CPRI v6.0 IP Core Loopback Modes on page 3-49
TX_DELAY Register
Table 5-21: CPRI v6.0 IP Core TX_DELAY Register at Offset 0x48
Bits Field Name Type Value on
Reset
Description
31:9 Reserved UR0 23'b0
5-16 TX_DELAY Register
UG-01156
2015.02.16
Altera Corporation CPRI v6.0 IP Core Registers
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