Visible to Intel only — GUID: nik1398984189699
Ixiasoft
Visible to Intel only — GUID: nik1398984189699
Ixiasoft
12.3. Deterministic Latency PHY Delay Estimation Logic
This section provides the equations to calculate delays when the Deterministic Latency PHY IP core implements CPRI protocol.
This section provides the equations to calculate delays when the Deterministic Latency PHY IP Core implements CPRI protocol. CPRI defines the radio base station interface between network radio equipment controllers (REC) and radio equipment (RE) components.
For RE
In single width (PMA =10) mode, add one UI delay per value of rx_std_bitslipboundaryselect. For constant round-trip delay (RX+TX), set tx_std_bitslipboundaryselect <= (5'd9 - rx_std_bitslipboundaryselect).
In double width (PMA =20) mode, add one UI delay per value of (5'd9 - rx_std_bitslipboundaryselect). For constant round-trip delay (RX+TX), set tx_std_bitslipboundaryselect <= rx_std_bitslipboundaryselect.
For REC
For Round Trip Delay
Total Delay Uncertainty
Round trip delay estimates are subject to process, voltage, and temperature (PVT) variation.
PCS Datapath Width | TX Phase Comp FIFO | Serializer | 8B/10B | Bitslip (tx_std_bitslipboundaryselect)9 | Total TX Parallel Clock Cycles | |
---|---|---|---|---|---|---|
Byte Serializer/Deserializer Turned Off | ||||||
8 bits | 1.0 | 1.0 | 1.0 | 0 | 3.0 | |
16 bits | 1.0 | 1.0 | 1.0 | 0 | 3.0 | |
Byte Serializer/Deserializer Turned On | ||||||
16 bits | 1.0 | 0.5 | 0.5 | 0 | 2.0 | |
32 bits | 1.0 | 0.5 | 0.5 | 0 | 2.0 |
PCS Datapath Width | RX Phase Comp FIFO | Byte Ordering | Deserializer | 8B/10B | Word Aligner 11 10 | Total RX Parallel Clock Cycles 10 11 | |
---|---|---|---|---|---|---|---|
Byte Serializer/Deserializer Turned Off | |||||||
8 bits | 1.0 | 1.0 | 1.0 | 1.0 | 4.0 | 8.0 | |
16 bits | 1.0 | 1.0 | 1.0 | 1.0 | 5.0 | 9.0 | |
Byte Serializer/Deserializer Turned On | |||||||
16 bits | 1.0 | 1.0 | 0.5 or 1.0 | 0.5 | 2.0 | 5.0 or 5.5 | |
32 bits | 1.0 | 1.0 | 0.5 or 1.0 | 0.5 | 2.5 | 5.5 or 6.0 |
Device | RX PMA Latency in UI | TX PMA Latency in UI | ||
---|---|---|---|---|
PCS to PMA Width 10 bits | PCS to PMA Width 20 bits | PCS to PMA Width 10 bits | PCS to PMA Width 20 bits | |
Cyclone V | 26 | 31 | 42 | 62 |
Arria V | 34 | 49 | 52 | 82 |
Arria V GZ | 26 | 31 | 53 | 83 |
Stratix V | 26 | 31 | 53 | 83 |