IPR-FFT Altera, IPR-FFT Datasheet - Page 45

• 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

Chapter 3: Functional Description
I/O Data Flow Architectures
Buffered Burst
Figure 3–11. FFT Buffered Burst Data Flow Architecture Simulation Waveform
© December 2010 Altera Corporation
source_ready
source_imag
source_valid
source_real
source_eop
source_sop
source_exp
sink_ready
sink_imag
sink_vaild
sink_eop
sink_real
sink_sop
reset_n
inverse
Figure 3–10. Data Flow—Engine with Bit-Reversal Mode
The buffered burst I/O data flow architecture FFT requires fewer memory resources
than the streaming I/O data flow architecture, but the tradeoff is an average block
throughput reduction.
Figure 3–11 on page 3–11
Following the de-assertion of the system reset, the data source asserts sink_valid to
indicate to the FFT function that valid data is available for input. A successful data
transfer occurs when both the sink_valid and the sink_ready are asserted.
The data source loads the first complex data sample into the FFT function and
simultaneously asserts sink_sop to indicate the start of the input block. On the next
clock cycle, sink_sop is de-asserted and the following N – 1 complex input data
samples should be loaded in natural order. On the last complex data sample,
sink_eop should be asserted.
clk
source_imag
source_valid
source_real
source_eop
source_sop
sink_ready
sink_imag
sink_valid
sink_eop
sink_real
sink_sop
reset_n
clk
-13609
-13609
shows an example simulation waveform.
EXP0
-47729
-47729
271
271
EXP1
31221
31221
-21224
-21224
EXP2
FFT MegaCore Function User Guide
EXP3
3–11