F-Tile Serial Lite IV Intel® FPGA IP User Guide

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ID 683074
Date 4/28/2022
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Document Table of Contents
Document Table of Contents x
1. About the F-Tile Serial Lite IV Intel® FPGA IP User Guide 2. F-Tile Serial Lite IV Intel® FPGA IP Overview 3. Getting Started 4. Functional Description 5. Parameters 6. F-Tile Serial Lite IV Intel® FPGA IP Interface Signals 7. Designing with F-Tile Serial Lite IV Intel® FPGA IP 8. F-Tile Serial Lite IV Intel® FPGA IP User Guide Archives 9. Document Revision History for the F-Tile Serial Lite IV Intel® FPGA IP User Guide
2. F-Tile Serial Lite IV Intel® FPGA IP Overview x
2.1. Release Information 2.2. Supported Features 2.3. IP Version Support Level 2.4. Device Speed Grade Support 2.5. Resource Utilization and Latency 2.6. Bandwidth Efficiency
3. Getting Started x
3.1. Installing and Licensing Intel® FPGA IP Cores 3.2. Specifying the IP Parameters and Options 3.3. Generated File Structure 3.4. Simulating Intel® FPGA IP Cores 3.5. Synthesizing IP Cores in Other EDA Tools 3.6. Compiling the Full Design
3.1. Installing and Licensing Intel® FPGA IP Cores x
3.1.1. Intel® FPGA IP Evaluation Mode
3.4. Simulating Intel® FPGA IP Cores x
3.4.1. Simulating and Verifying the Design
4. Functional Description x
4.1. TX Datapath 4.2. RX Datapath 4.3. F-Tile Serial Lite IV Intel® FPGA IP Clock Architecture 4.4. Reset and Link Initialization 4.5. Link Rate and Bandwidth Efficiency Calculation
4.1. TX Datapath x
4.1.1. TX MAC Adapter 4.1.2. Control Word (CW) Insertion 4.1.3. TX CRC 4.1.4. TX MII Encoder 4.1.5. TX PCS and PMA
4.1.2. Control Word (CW) Insertion x
4.1.2.1. Start-of-burst CW 4.1.2.2. End-of-burst CW 4.1.2.3. Alignment Paired CW 4.1.2.4. Empty-cycle CW 4.1.2.5. Idle CW 4.1.2.6. Data Word
4.2. RX Datapath x
4.2.1. RX PCS and PMA 4.2.2. RX MII Decoder 4.2.3. RX CRC 4.2.4. RX Deskew 4.2.5. RX CW Removal
4.4. Reset and Link Initialization x
4.4.1. TX Reset and Initialization Sequence 4.4.2. RX Reset and Initialization Sequence
6. F-Tile Serial Lite IV Intel® FPGA IP Interface Signals x
6.1. Clock Signals 6.2. Reset Signals 6.3. MAC Signals 6.4. Transceiver Reconfiguration Signals 6.5. PMA Signals
7. Designing with F-Tile Serial Lite IV Intel® FPGA IP x
7.1. Reset Guidelines 7.2. Error Handling Guidelines
1. About the F-Tile Serial Lite IV Intel® FPGA IP User Guide
2. F-Tile Serial Lite IV Intel® FPGA IP Overview
3. Getting Started
4. Functional Description
5. Parameters
6. F-Tile Serial Lite IV Intel® FPGA IP Interface Signals
7. Designing with F-Tile Serial Lite IV Intel® FPGA IP
8. F-Tile Serial Lite IV Intel® FPGA IP User Guide Archives
9. Document Revision History for the F-Tile Serial Lite IV Intel® FPGA IP User Guide

4.5. Link Rate and Bandwidth Efficiency Calculation

The F-Tile Serial Lite IV Intel® FPGA IP bandwidth efficiency calculation is as below:

Bandwidth efficiency = raw_rate * 64/66 * (burst_size - burst_size_ovhd)/burst_size * [align_marker_period / (align_marker_period + align_marker_width)] * [(srl4_align_period - 2) / srl4_align_period]

Table 17.  Bandwidth Efficiency Variables Description
Variable Description
raw_rate This is the bit rate achieved by the serial interface.

raw_rate = SERDES width * transceiver clock frequency

Example: raw_rate = 64 * 402.812500 Gbps = 25.78 Gbps

burst_size

Value of burst size.

To calculate average bandwidth efficiency, use common burst size value.

For maximum rate, use maximum burst size value.
burst_size_ovhd The burst size overhead value.

In Full mode, the burst_size_ovhd value is referring to the START and END paired CWs.

In Basic mode, there is no burst_size_ovhd because there is no START and END paired CWs.

align_marker_period

The value of the period where an alignment marker is inserted.

The value is 81920 clock cycle for compilation and 1280 for fast simulation. This value is obtained from the PCS hard logic.
align_marker_width The number of clock cycles where a valid alignment marker signal is held high.
srl4_align_period The number of clock cycles between two alignment markers. You can set this value using the Alignment Period parameter in the IP Parameter Editor.

The link rate calculations are as below:

Effective rate = bandwidth efficiency * raw_rate

You can get the maximum user clock frequency with the following equation. The maximum user clock frequency calculation assumes continuous data streaming and no IDLE cycle occurs at the user logic. This rate is important when designing the user logic FIFO to avoid FIFO overflow.

Maximum user clock frequency = effective rate / 64

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