IPR-FFT Altera, IPR-FFT Datasheet - Page 26

• Manufacturer Part Number: IPR-FFT
• Description: IP CORE Renewal Of IP-FFT
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IPR-FFT

• Software Application: IP CORE, DSP Filters And Transforms
• Supported Families: Arria GX, Cyclone, HardCopy, Stratix
• Features: Bit-Accurate MATLAB Models, Radix-4 And Mixed Radix-4/2 Implementations
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: Fast Fourier Transform Processor
• License: Renewal License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

2–6
FFT MegaCore Function User Guide
6. Click the Implementation Options tab
Figure 2–6. Implementation Options Tab
If you select Variable Streaming I/O data flow, the Transform length (specified
on the Architecture Tab) represents the maximum transform length that can be
performed. All transforms of length 2
performed at runtime.
1
If you select Variable Streaming I/O data flow, options to set the I/O order and
data representation are visible. The Input Order option allow you to select the
order in which the samples are presented to the FFT. If you select Natural Order,
the FFT expects the order of the input samples to be sequential (1, 2 …, n – 1, n)
where n is the size of the current transform. For Bit Reverse Order, the FFT expects
the input samples to be in bit-reversed order. For –N/2 to N/2, the FFT expects the
input samples to be in the order –N/2 to (N/2) – 1 (also known as DC-centered
order). Similarly the Output Order option specifies the order in which the FFT
generates the output. You can also select Fixed Point or Floating Point data
representation. If you select Fixed Point, the FFT variation implements the
radix-2
the mixed radix-4/2 architecture.
If you select Variable Streaming and Floating Point on the Architecture
tab, the precision (on the Parameters tab) is automatically set to 32.
2
architecture; if you select Floating Point, the FFT variation implements
m
where 6 ≤ m ≤ log
(Figure
2–6).
© December 2010 Altera Corporation
2
MegaWizard Plug-In Manager Flow
(transform length) can be
Chapter 2: Getting Started