CIC Intel® FPGA IP: User Guide

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ID 683246
Date 9/30/2019
Public
Document Table of Contents
Document Table of Contents x
1. About the CIC Intel® FPGA IP 2. CIC Intel® FPGA IP Getting Started 3. CIC Intel® FPGA IP Functional Description 4. CIC Intel® FPGA IP User Guide Document Archives 5. CIC Intel® FPGA IP User Guide Document Revision History
1. About the CIC Intel® FPGA IP x
1.1. DSP Intel® FPGA IP Features 1.2. CIC Intel® FPGA IP Features 1.3. DSP Intel® FPGA IP Device Family Support 1.4. DSP Intel® FPGA IP Verification 1.5. CIC Intel® FPGA IP Release Information 1.6. CIC Intel® FPGA IP Performance and Resource Utilization
2. CIC Intel® FPGA IP 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 2.5. DSP Builder for Intel® FPGAs Design Flow
2.1. Installing and Licensing Intel® FPGA IP Cores x
2.1.1. Intel® FPGA IP Evaluation Mode 2.1.2. CIC 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. CIC Intel® FPGA IP Functional Description x
3.1. Variable Rate Change Factors 3.2. Multichannel Support 3.3. CIC Output Options 3.4. FIR Filter Compensation Coefficients 3.5. CIC Intel® FPGA IP Parameters 3.6. CIC Intel® FPGA IP Interfaces and Signals
3.2. Multichannel Support x
3.2.1. Multiple Input Single Output (MISO) 3.2.2. Single Input Multiple Output (SIMO)
3.3. CIC Output Options x
3.3.1. Output Data Width 3.3.2. Output Rounding 3.3.3. Hogenauer Pruning
3.6. CIC Intel® FPGA IP Interfaces and Signals x
3.6.1. Avalon Streaming Interfaces in DSP Intel FPGA IP 3.6.2. CIC Intel® FPGA IP Signals 3.6.3. Avalon Streaming Interface Data Transfer Timing 3.6.4. Packet Data Transfers
1. About the CIC Intel® FPGA IP
2. CIC Intel® FPGA IP Getting Started
3. CIC Intel® FPGA IP Functional Description
4. CIC Intel® FPGA IP User Guide Document Archives
5. CIC Intel® FPGA IP User Guide Document Revision History

3.2.1. Multiple Input Single Output (MISO)

In many practical designs, channel signals come from different input interfaces. On each input interface, the same parameters including rate change factors apply to the channel data that the CIC filter is going to process. The CIC IP allows multiple input single output (MISO) decimation filters, which allows the flexibility to exploit time sharing of the low-rate differentiator sections.

The CIC achieves time sharing by providing multiple input interfaces and processing chains for the high rate portions. It then combines all of the processing associated with the lower rate portions into a single processing chain. This strategy can lead to full utilization of the resources and represents the most efficient hardware implementation.

Figure 8. Multiple Input Single Output Architecture For Four ChannelsThe symbols A, B, C, D are multiplexed into one output A, B, C, D

The sampling frequency of the input data only allows time multiplexes of two channels per bus. Therefore, you must configure the CIC filter with two input interfaces. For two interfaces, the rate change factor must also be at least two to exploit this architecture. The CIC support up to 1,024 channels by using multiple input interfaces in this way.

Note: The CIC applies the MISO architecture when you select a decimation filter and the number of interfaces is greater than one.
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