参数资料
型号: IP-FFT
厂商: Altera
文件页数: 55/70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
3–13
I/O Data Flow Architectures
Burst
The burst I/O data flow architecture operates similarly to the buffered burst
architecture, except that the burst architecture requires even lower memory resources
for a given parameterization at the expense of reduced average throughput.
Figure 3–14 shows the simulation results for the burst architecture. Again, the signals
source_valid and sink_ready indicate, to the system data sources and slave sinks
either side of the FFT, when the FFT can accept a new block of data and when a valid
output block is available on the FFT output.
Figure 3–14. FFT Burst 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
-47729
-47729
271
271
source_exp
EXP0
EXP1
EXP2
source_ready
source_valid
source_sop
source_eop
In a burst I/O data flow architecture, the core can process a single input block only.
There is a small FIFO buffer at the sink of the block and sink_ready is not deasserted
until this FIFO buffer is full. Thus you can provide a small number of additional input
samples associated with the subsequent input block. It is not mandatory to provide
data to the FFT during sink_ready cycles. The burst architecture can load the rest of
the subsequent FFT frame only when the previous transform has been fully unloaded.
f For information about enabling the buffered burst FFT, refer to “Enabling the
November 2013
Altera Corporation
FFT MegaCore Function
User Guide
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