AN 464: DFT/IDFT Reference Design

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ID 683644
Date 5/30/2018
Public
Document Table of Contents
Document Table of Contents x
About the DFT/IDFT Reference Design Functional Description for the DFT/IDFT Reference Design Getting Started with the DFT/IDFT Reference Design Running the Fixed-Point Model for the DFT/IDFT Reference Design Performance of DFT/IDFT Reference Design Document Revision History for AN 464: DFT/IDFT Reference Design
Functional Description for the DFT/IDFT Reference Design x
Parameters for the DFT/IDFT Reference Design Signals for the DFT/IDFT Reference Design
Getting Started with the DFT/IDFT Reference Design x
System Requirements for the DFT/IDFT Reference Design Installing the DFT/IDFT Reference Design Simulating the DFT/IDFT Reference Design with the Avalon-ST Testbench Simulating the Reference design with the Command Line Regression Test Synthezising the DFT/IDFT Reference Design
Running the Fixed-Point Model for the DFT/IDFT Reference Design x
Fixed-Point Model Parameters
About the DFT/IDFT Reference Design
Functional Description for the DFT/IDFT Reference Design
Getting Started with the DFT/IDFT Reference Design
Running the Fixed-Point Model for the DFT/IDFT Reference Design
Performance of DFT/IDFT Reference Design
Document Revision History for AN 464: DFT/IDFT Reference Design

Parameters for the DFT/IDFT Reference Design

Table 2.  Parameters
Name Values Description
Idft_mode 0 or 1 0 = DFT, 1 = inverse DFT.
iqinpercc 1 or 3 Input. IQ samples per clock cycle.
datawidth 16 .. 24 Internal datapath and input widths in bits.
twidwidth 14 .. 24 Twiddle factor and butterfly weight coefficient widths in bits (internal to the design).
use_output_buffer 0 or 1

0 = no output buffer is instantiated and the output interface does not have a ready input (source_ready_inis inactive).

1= an output buffer is instantiated, which allows the reading of data from the design to be paused. The ready latency is 0.

BUFFER_DEPTH 4 .. 2048 Ifuse_output_buffer=1, this parameter defines the buffer depth. Each buffer location corresponds to one pair of complex (I and Q) samples.
BUFFER_DEPTH_N 2 .. 11

Set so that 2BUFFER_DEPTH_N>=

BUFFER_DEPTH

For example, if BUFFER_DEPTH= 600, set

BUFFER_DEPTH_Nto 10.
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