参数资料
型号: IP-FFT
厂商: Altera
文件页数: 49/70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
3–7
I/O Data Flow Architectures
Streaming
The streaming I/O data flow FFT architecture allows continuous processing of input
data, and outputs a continuous complex data stream without the requirement to halt
the data flow in or out of the FFT function.
Streaming FFT Operation
Figure 3–3 on page 3–7 shows an example simulation waveform.
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.
When the data transfer is complete, sink_sop is deasserted and the data samples are
loaded in natural order.
For more information about the signals, refer to Table 3–4 on page 3–16 .
f For more information about the Avalon-ST interface, refer to the Avalon Interface
Specifications .
Figure 3–3. FFT Streaming Data Flow Architecture Simulation Waveform
clk
reset_n
sink_valid
sink_ready
sink_sop
sink_eop
inverse
sink_real
sink_imag
source_real
source_imag
source_exp
EXP0
EXP1
EXP2
EXP3
source_ready
source_valid
source_sop
source_eop
Figure 3–4 shows the input flow control. When the final sample is loaded, the source
asserts sink_eop and sink_valid for the last data transfer.
Figure 3–4. FFT Streaming Data Flow Architecture Input Flow Control
clk
reset_n
sink_valid
sink_ready
sink_sop
inverse
sink_real
xr(0)
xr(1)
xr(2) xr(3) xr(4) xr(5)
xr(6) xr(7)
sink_imag
xi(0)
xi(1) xi(2) xi(3) xi(4) xi(5) xi(6)
xi(7)
November 2013
Altera Corporation
FFT MegaCore Function
User Guide
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