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FFT0064 – 64 POINT FFT IP CORE


Introduction

The FFT0064 core implements 64 point FFT in hardware. FFT 64 works on blocks of 64 complex data samples.
Applications
IEEE802.11 Wi-Fi
GPS
Communication system

Features

Supports both FFT and IFFT
In built bit reversal algorithm
Low Latency
Throughput of 1 sample per clock
Parameterized bit widths and fixed point option.
Test bench with fixed point Matlab model
Matlab model can be used to tune the bit-width to get the SQNR performance.
Available in ASIC and FPGA technologies
Available in ASIC and FPGA technologies
Minimal gate count implementation
Supports flushing and re-starting the FFT operation instantly
Pin Description

  1 In   Clock
  1 In   Active low asynchronous reset
clr 1 In   Active high Synchronous Reset
fft_mode 1 In   0: FFT operation
  1: IFFT operation
  N In   N bit in-phase input data
  N In   N bit quad-phase input data
  1 In   Input Data Valid
  1 In   Start the FFT computation. This signal   should be asserted either   on the last   input data sample or anytime after   sending all input   data. Internal FFT   engine will start FFT computation when   fft_din_start is sampled high on the   clock edge. FFT output will   be available   after fixed latency
  1 In   Input Address mode.
  1’b0 » Use internal addressing to store   input data into the   internal buffers.
  1’b1 » Use external addressing   (din_addr) to store input data   into the   internal buffers
  6 In   Input address when in_addr_mode is   set to 1
  1 In   Output Address mode. 1’b0 Use internal addressing to read the   FFT output data from the internal buffers. 1’b1 Use external   addressing (dout_addr) to read the FFT output data from internal   buffers
  6 In   Output address when out_addr_mode is set to 1
fft_dout_i N Out   N bit in-phase output data
fft_dout_q N Out   N bit quad-phase output data
fft_dout_vld 1 Out   Output data valid
fft_dout_start 1 Out   Asserted on the first output point of FFT. This signal is asserted   after fixed latency from fft_din_start
 
Function Description
Figure 1. FFT0064 Block Diagram
FFT0064 can process 64 pt FFT or 64 pt IFFT based on input mode (fft_mode). The mode can be switched dynamically.
FFT0064 supports two different modes of input data/output data streaming.
Natural order: In natural order the input buffer addressing is controlled internally. On reset the internal address is set to 0 corresponding to the first fft/ifft input point.
In external address mode, (in_addr_mode ==1), the input data is stored inside internal buffer at the location indicated by din_addr.
The FFT or IFFT radix operations start when fft_din_start pulse is sampled high. The FFT data output will be streamed out after fixed latency. The fft_dout_start pulse is asserted on the first output data sample.
Similar to input address mode, output address mode can also be controlled internally or externally by providing dout_addr.
Interface timing Diagram
Figure 2. FFT0064 Timing Diagram
Deliverables
HDL Source Licenses
Synthesizable Verilog RTL source code
Fixed-point Octave(Matlab compatible) model.
Simulation scripts
Self-checking Test environment
Test-bench
Test-vectors
Expected results
Synthesis scripts
User Documentation
 
 
Contact Information
IP Cores, Inc.
3731 Middlefield Rd.
Palo Alto, CA 94303, USA
Phone: +1 (650) 814-0205
E-mail: info@ipcores.com
www.ipcores.com