参数资料
型号: IP-FFT
厂商: Altera
文件页数: 53/70页
文件大小: 0K
描述: IP FFT/IFFT
标准包装: 1
系列: *
类型: MegaCore
功能: 快速傅里叶变换处理器
许可证: 初始许可证
Chapter 3: Functional Description
3–11
I/O Data Flow Architectures
Figure 3–10 shows the data flow output when the FFT is operating in engine with
bit-reversal or digit-reversal mode, respectively
Figure 3–10. Data Flow—Engine with Bit-Reversal or Digit-Reversal Mode
clk
reset_n
sink_valid
sink_ready
sink_sop
sink_eop
sink_real
sink_imag
source_real
source_imag
source_valid
source_sop
source_eop
Buffered Burst
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 shows an example simulation waveform.
Figure 3–11. FFT Buffered Burst Data Flow Architecture Simulation Waveform
clk
reset_n
sink_vaild
sink_ready
sink_sop
sink_eop
inverse
sink_real
sink_imag
-13609
-13609
-47729
-47729
271
271
31221
31221
-21224
-21224
source_real
source_imag
source_exp
EXP0
EXP1
EXP2
EXP3
source_ready
source_valid
source_sop
source_eop
Following the deassertion 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 deasserted and the following N – 1 complex input data
samples must be loaded in natural order. On the last complex data sample, sink_eop
must be asserted.
November 2013
Altera Corporation
FFT MegaCore Function
User Guide
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