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参数资料
| 型号： | IPR-FFT |
| 厂商： | Altera |
| 文件页数： | 45/70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 |
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Chapter 3: Functional Description
3–3
The Avalon Streaming Interface
Fixed point representation allows for natural word growth through the pipeline. The
maximum growth of each stage is 2 bits. After the complex multiplication the data is
rounded down to the expanded data size using convergent rounding. The overall bit
growth is less than or equal to log 2 (N)+1.
The floating point internal data representation is single precision floating point
(32-bit, IEEE 754 representation). Floating point operations provide more precise
computation results but are costly in hardware resources. To reduce the amount of
logic required for floating point operations, the variable streaming FFT uses "fused"
floating point kernels. The reduction in logic occurs by fusing together several
floating point operations and reducing the number of normalizations that need to
occur.
You can select input and output orders generated by the FFT. Table 3–1 shows the
input and output order options.
Table 3–1. Input & Output Order Options
Input Order
Natural
Bit reversed
DC-centered
Natural
Bit reversed
DC-centered
Output Order
Bit reversed
Natural
Bit-reversed
Natural
Bit reversed
Natural
Mode
Engine-only
Engine with
bit-reversal
Comments
Requires minimum memory and minimum latency.
At the output, requires an extra N complex memory
words and an additional N clock cycles latency,
where N is the size of the transform.
Some applications for the FFT require an FFT > user operation > IFFT chain. In this
case, choosing the input order and output order carefully can lead to significant
memory and latency savings. For example, consider where the input to the first FFT is
in natural order and the output is in bit-reversed order (FFT is operating in engine-
only mode). In this example, if the IFFT operation is configured to accept bit-reversed
inputs and produces natural order outputs (IFFT is operating in engine-only mode),
only the minimum amount of memory is required, which provides a saving of N
complex memory words, and a latency saving of N clock cycles, where N is the size of
the current transform.
The Avalon Streaming Interface
The Avalon-ST interface defines a standard, flexible, and modular protocol for data
transfers from a source interface to a sink interface and simplifies the process of
controlling the flow of data in a datapath.
The Avalon-ST interface signals can describe traditional streaming interfaces
supporting a single stream of data without knowledge of channels or packet
boundaries. Such interfaces typically contain data, ready, and valid signals. The
Avalon-ST interface can also support more complex protocols for burst and packet
transfers with packets interleaved across multiple channels.
The Avalon-ST interface inherently synchronizes multi-channel designs, which allows
you to achieve efficient, time-multiplexed implementations without having to
implement complex control logic.
November 2013
Altera Corporation
FFT MegaCore Function
User Guide
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IPR-FIR | 功能描述:开发软件 FIR Compiler MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
| IPR-FIRII | 功能描述:开发软件 FIR Compiler II MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
| IPRI2CCMFP001 | 制造商:System Level Solutions (SLS) 功能描述:IP CORE, FPGA, I2C CNTLR, FOR CYCLONE, STRATIX, Software Application:IP CORE, In |
| IPR-ILKN/100G | 功能描述:开发软件 Interlaken - 100G MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
| IPR-ILKN/50G | 功能描述:开发软件 Interlaken - 50G MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
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