参数资料
| 型号： | IP-NCO |
| 厂商： | Altera |
| 文件页数： | 30/54页 |
| 文件大小： | 0K |
| 描述： | IP NCO COMPILER |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | MegaCore |
| 功能： | 数控振荡器编译器 |
| 许可证： | 初始许可证 |
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3–8
Chapter 3: Parameter Settings
Parameter Descriptions
Parameter Descriptions
This section describes the NCO MegaCore function parameters, which can be set in
the user interface as described in “Setting Parameters” on page 3–1 .
Table 3–1 shows the parameters that can be set in the Parameters page.
1
The default values for each parameter are shown in bold font in the tables.
Table 3–1. NCO MegaCore Function Parameters Page
Parameter
Generation Algorithm
Value
Small ROM, Large ROM,
CORDIC, Multiplier-Based
Description
Select the required algorithm.
Phase Accumulator
Precision
4–64, Default = 32
Select the required phase accumulator precision.
(1)
Angular Resolution
4–24 or 32, Default = 16
Select the required angular resolution.
(2)
Magnitude Precision
10–32, Default = 18
Select the required magnitude precision.
Implement Phase Dithering On or Off
Turn on to implement phase dithering.
When phase dithering is enabled you can use the slider control to
Dither Level
Clock Rate
Desired Output Frequency
Phase Increment Value
Real Output Frequency
Min–Max
1–999 MHz, kHz, Hz, mHz,
Default = 100 MHz
1–999 MHz, kHz, Hz, mHz,
Default = 1 MHz
—
—
adjust the dither level between its minimum and maximum
values,
You can select the clock rate using units of MegaHertz, kiloHertz,
Hertz or milliHertz.
You can select the desired output frequency using units of
MegaHertz, kiloHertz, Hertz or milliHertz.
Displays the phase increment value calculated from the clock rate
and desired output frequency.
Displays the calculated value of the real output frequency.
Notes to Table 3–1 :
(1) The phase accumulator precision must be greater than or equal to the specified angular resolution.
(2) The maximum value is 24 for small and large ROM algorithms; 32 for CORDIC and multiplier-based algorithms.
Table 3–2 shows the parameters that can be set in the Implementation page.
Table 3–2. NCO MegaCore Function Implementation Page (Part 1 of 2)
Parameter
Frequency Modulation input
Modulator Resolution
Modulator Pipeline Level
Phase Modulation Input
Modulator Precision
Modulator Pipeline Level
Outputs
NCO MegaCore Function
User Guide
Value
On or Off
4–64, Default = 32
1, 2, Default = 1
On or Off
4–32, Default = 16
1, 2, Default = 1
Dual Output , Single
Output
Description
You can optionally enable the frequency modulation input.
Select the modulator resolution for the frequency modulation
input.
Select the modulator pipeline level for the frequency modulation
input.
You can optionally enable the phase modulation input.
Select the modulator precision for the phase modulation input.
Select the modulator pipeline level for the phase modulation input.
Select whether to use a dual or single output.
November 2013 Altera Corporation
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