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| 型号： | IPR-NCO |
| 厂商： | Altera |
| 文件页数： | 36/54页 |
| 文件大小： | 0K |
| 描述： | IP NCO COMPILER RENEW |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | MegaCore |
| 功能： | 数控振荡器编译器 |
| 许可证： | 续用许可证 |
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4–4
Chapter 4: Functional Description
Functional Description
f clk
M
f res = ------- Hz
2
For example, if a 100 MHz clock drives an NCO with an accumulator precision of 32
bits, the frequency resolution of the oscillator is 0.0233 Hz. For an output frequency of
6.25 MHz from this oscillator, you should apply an input phase increment of:
6.25 ? 10
------------------------- ? 2
100 ? 10
6
6
32
= 268435456
The NCO MegaCore function automatically calculates this value, using the specified
parameters. IP Toolbench also sets the value of the phase increment in all testbenches
and vector source files it generates.
Similarly, the generated output frequency, f FM for a given frequency modulation
increment, ? FM is determined by the following equation:
? FM f clk
F
f FM = ------------------ Hz
2
where F is the modulator resolution
The angular precision of an NCO is the phase angle precision before the polar-to-
cartesian transformation. The magnitude precision is the precision to which the sine
and/or cosine of that phase angle can be represented. The effects of reduction or
augmentation of the angular, magnitude, accumulator precision on the synthesized
waveform vary across NCO architectures and for different f o / f clk ratios.
You can view these effects in the NCO time and frequency domain graphs as you
change the NCO MegaCore function parameters.
Architectures
The NCO MegaCore function supports large ROM, small ROM, CORDIC, and
multiplier-based architectures.
Large ROM Architecture
Use the large ROM architecture if your design requires very high speed sinusoidal
waveforms and your design can use large quantities of internal memory.
In this architecture, the ROM stores the full 360 degrees of both the sine and cosine
waveforms. The output of the phase accumulator addresses the ROM.
Because the internal memory holds all possible output values for a given angular and
magnitude precision, the generated waveform has the highest spectral purity for that
parameter set (assuming no dithering). The large ROM architecture also uses the
fewest logic elements (LEs) for a given set of precision parameters.
Small ROM Architecture
If low LE usage and high output frequency are a high priority for your system, use the
small ROM architecture to reduce your internal memory usage.
NCO MegaCore Function
User Guide
November 2013 Altera Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IPR-NIOS | 功能描述:开发软件 Nios 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 |
| IPROBER 520 | 制造商:TTi-Thurlby Thandar Instruments 功能描述:Bulk 制造商:Aim & Thurlby Thandar Instruments 功能描述:PROBE, CURRENT, POSITIONAL, ON PCB TRACK 制造商:Aim & Thurlby Thandar Instruments 功能描述:PROBE, CURRENT, 5MHZ, 2M; Test Probe Ratio:-; Connector Type A:-; Connector Type B:-; Lead Length:2m; Bandwidth:5MHz; SVHC:No SVHC (19-Dec-2012) ;RoHS Compliant: NA |
| IPR-PCI/MT32 | 功能描述:开发软件 PCI 32b MasterTarget 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-PCI/MT64 | 功能描述:开发软件 PCI 64b MasterTarget 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-PCI/T32 | 功能描述:开发软件 PCI 32-bit Target 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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