参数资料
型号: IPR-FFT
厂商: Altera
文件页数: 60/70页
文件大小: 0K
描述: IP FFT/IFFT RENEW
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: 续用许可证
3–18
Chapter 3: Functional Description
Signals
Table 3–5 shows the component specific signals.
Table 3–5. Component Specific Signals
Signal Name
fftpts_in
Direction
Input
Size
log 2 ( maximum
number of points )
Description
The number of points in this FFT frame. If this value is not specified, the
FFT can not be a variable length. The default behavior is for the FFT to
have fixed length of maximum points. Only sampled at SOP.
fftpts_out
Output
log 2 ( maximum The number of points in this FFT frame synchronized to the Avalon-ST
number of points ) source interface. Variable streaming only.
inverse
clk_ena
Input
Input
1
1
Inverse FFT calculated if asserted. Only sampled at SOP.
Active-high global clock enable input. If deasserted, the FFT is disabled.
Incorrect usage of the Avalon-ST interface protocol on the sink interface results in a
error on source_error . Table 3–6 defines the behavior of the FFT when an incorrect
Avalon-ST transfer is detected. If an error occurs, the behavior of the FFT is undefined
and you must reset the FFT with reset_n .
Table 3–6. Error Handling Behavior
Error
Missing SOP
Missing EOP
Unexpected EOP
FFT MegaCore Function
User Guide
source_error
01
10
11
Description
Asserted when valid goes high, but there is no start of frame.
Asserted if the FFT accepts N valid samples of an FFT frame, but there is no EOP signal.
Asserted if EOP is asserted before N valid samples are accepted.
November 2013 Altera Corporation
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