NCO IP Core: User Guide

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ID 683406
Date 11/06/2017
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Document Table of Contents
Document Table of Contents x
1. About the NCO IP Core 2. NCO IP Core Getting Started 3. NCO IP Core Functional Description A. NCO IP Core User Guide Document Archives 4. Document Revision History
1. About the NCO IP Core x
1.1. Intel® DSP IP Core Features 1.2. NCO IP Core Features 1.3. DSP IP Core Device Family Support 1.4. NCO IP Core MegaCore Verification 1.5. NCO IP Core Release Information 1.6. NCO IP Core Performance and Resource Utilization
2. NCO IP Core Getting Started x
2.1. Installing and Licensing Intel® FPGA IP Cores 2.2. IP Catalog and Parameter Editor 2.3. Generating IP Cores ( Intel® Quartus® Prime Pro Edition) 2.4. Simulating Intel® FPGA IP Cores
2.1. Installing and Licensing Intel® FPGA IP Cores x
2.1.1. Intel® FPGA IP Evaluation Mode 2.1.2. NCO IP Core Intel® FPGA IP Evaluation Mode Timeout Behavior
2.3. Generating IP Cores ( Intel® Quartus® Prime Pro Edition) x
2.3.1. IP Core Generation Output ( Intel® Quartus® Prime Pro Edition)
3. NCO IP Core Functional Description x
3.1. NCO IP Core Architectures 3.2. Multichannel NCOs 3.3. Frequency Hopping 3.4. Phase Dithering 3.5. Frequency Modulation 3.6. Phase Modulation 3.7. NCO IP Core Parameters 3.8. NCO IP Core Interfaces and Signals
3.1. NCO IP Core Architectures x
3.1.1. Large ROM Architecture 3.1.2. Small ROM Architecture 3.1.3. CORDIC Architecture 3.1.4. Multiplier-Based Architecture
3.7. NCO IP Core Parameters x
3.7.1. Architecture Parameters 3.7.2. Frequency Parameters 3.7.3. Optional Ports Parameters
3.8. NCO IP Core Interfaces and Signals x
3.8.1. Avalon-ST Interfaces in DSP IP Cores 3.8.2. NCO IP Core Signals 3.8.3. NCO IP Core Timing Diagrams
1. About the NCO IP Core
2. NCO IP Core Getting Started
3. NCO IP Core Functional Description
A. NCO IP Core User Guide Document Archives
4. Document Revision History

3.1.4. Multiplier-Based Architecture

The multiplier-based architecture uses multipliers to reduce memory usage. You can choose to implement the multipliers in either:
  • Logic elements (Cyclone series) or combinational ALUTs (Stratix series).
  • Dedicated multiplier circuitry (for example, dedicated DSP blocks) (Stratix or Arria series).
Note: When you specify a dual output multiplier-based NCO, the IP core provides an option to output a sample every two clock cycles. This setting reduces the throughput by a factor of two and halves the resources required by the waveform generation unit.
Table 7.  Architecture Comparison
Architecture Advantages
Large ROM Good for high speed and when a large quantity of internal memory is available. Gives the highest spectral purity and uses the fewest logic elements for a given parameterization.
Small ROM Good for high output frequencies with reduced internal memory usage when a lower SFDR is acceptable.
CORDIC High performance solution when internal memory is at a premium. The serial CORDIC architecture uses fewer resources than parallel although the throughput is reduced.
Multiplier-Based Reduced memory usage by implementing multipliers in logic elements or dedicated circuitry.
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