IP-CPRI Altera, IP-CPRI Datasheet - Page 64

• 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

4–40
Figure 4–20. Multihop CPRI Configuration Delay Measurement Reference Points
CPRI MegaCore Function User Guide
cpri_tx_sync_rfp
REC Master
cpri_rx_rfp
SAPs
Rx Path Delay
T_T4
T_R1
1
T_txv_TX
T_txv_RX
Transceiver
and SFP
R4
R1
Figure 4–20
delay measurements for multihop CPRI configurations. The duration of TBdelay
depends on your routing layer implementation.
The following sections describe the delay through the CPRI IP core on the Rx path and
on the Tx path to the SAP—the AUX interface—and the deterministic values for
transceiver latency and delay through the IP core. They describe the calculation of the
round-trip cable delay T14, the Toffset delay, and the round-trip (SAP to SAP) delay in
the single-hop and multihop cases.
The
the AxC blocks, because the round-trip delay calculations and the multihop
configuration delay calculations do not take the AxC blocks into account. For
purposes of these calculations, the relevant SAP is the AUX interface. For information
about the delays through the AxC blocks, refer to
page 4–29
The Rx path delay is the cumulative delay from the arrival of the first bit of a 10 ms
radio frame on the CPRI Rx interface to the start of transmission of the radio frame on
the AUX interface.
T14
optical link
optical link
T34
“Rx Path Delay”
T12
R2
R3
and
Transceiver
T_txv_RX
and SFP
T_txv_TX
shows the reference points you can use to determine the CPRI IP core
“CPRI MAP Transmitter Interface” on page
T_R1
T_T4
Toffset
AUX IF
and
cpri_rx_rfp
cpri_tx_rfp
RE Slave
“Tx Path Delay”
Routing Layer
TBdelay DL
TBdelay UL
RE Master
cpri_rx_rfp
AUX IF
sections do not discuss the delays through
T_T4
T_R1
T_txv_TX
T_txv_RX
Transceiver
“CPRI MAP Receiver Interface” on
and SFP
R4
R1
T14
optical link
optical link
4–31.
T34
T12
Chapter 4: Functional Description
May 2011 Altera Corporation
R2
R3
Transceiver
T_txv_TX
T_txv_RX
and SFP
Delay Measurement
T_R1
T_T4
Toffset
SAPs
cpri_tx_rfp
cpri_rx_rfp
RE Slave