参数资料
型号: IP-FFT
厂商: Altera
文件页数: 52/70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
3–10
Chapter 3: Functional Description
I/O Data Flow Architectures
Dynamically Changing the FFT Size
When the size of the incoming FFT changes, the FFT stalls the incoming data
(deasserts the sink_ready signal) until all of the previous FFT frames of the previous
FFT size have been processed and transferred to the output. Figure 3–8 shows
dynamically changing the FFT size for engine-only mode.
Figure 3–8. Dynamically Changing the FFT Size
clock
reset_n
sink_valid
sink_ready
sink_sop
sink_eop
fftps
inverse
sink_real
sink_imag
source_real
source_imag
source_ready
source_valid
source_sop
source_eop
The Effect of I/O Order
The order of samples entering and leaving the FFT is determined by your selection in
the Architecture tab under I/O Order . This selection also determines if the FFT is
operating in engine-only mode or engine with bit-reversal or digit-reversal mode.
If the FFT operates in engine-only mode, the output data is available after
approximately N + latency clocks cycles after the first sample was input to the FFT.
Latency represents a small latency through the FFT core and depends on the
transform size. For engine with bit-reversal mode, the output is available after
approximately 2 N + latency cycles.
Figure 3–9 shows the data flow output when the FFT is operating in engine-only
mode.
Figure 3–9. Data Flow—Engine-Only 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
FFT MegaCore Function
User Guide
November 2013 Altera Corporation
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