Altera NCO MegaCore Function Manuale Utente Scaricare il pdf (Pagina 25)

Parameter Value Description

Number of Bands 1–16 Select a number of bands greater than 1 to enable

frequency hopping. Frequency hopping is not

supported in the serial CORDIC architecture.

Use dedicated

multipliers

On or off When the multiplier-based algorithm is selected on

the Parameters page, turn on to use dedicated

multipliers and select the number of clock cycles

per output, otherwise the design uses logic

elements. This option is not available if you target

the Cyclone device family.

CORDIC

Implementation

Parallel, Serial When you select the CORDIC generation

algorithm, you can select a parallel (one output per

clock cycle) or serial (one output per 18 clock

cycles) implementation.

Clock Cycles Per

Output

1, 2. When the multiplier-based algorithm is selected on

the Parameters page, you can select 1 or 2 clock

cycles per output.

Related Information

NCO IP Core Architectures on page 3-2

Frequency Parameters

Table 3-4: Frequency Parameters

Parameter Value Description

Phase Accumulator

Precision

4 to 64, Select the required phase accumulator precision. The

phase accumulator precision must be greater than or

equal to the specified angular resolution.

Angular Resolution 4 to 24 or 32, Select the required angular resolution. The

maximum value is 24 for small and large ROM

algorithms; 32 for CORDIC and multiplier-based

algorithms.

Magnitude Precision 10 to 32, Select the required magnitude precision.

Implement Phase

Dithering

On or Off Turn on to implement phase dithering.

Dither Level Min to Max When phase dithering is enabled you can use the

slider control to adjust the dither level between its

minimum and maximum values,

Clock Rate 1 to 999 MHz, kHz,

Hz, mHz,

Select the clock rate using units of MegaHertz,

kiloHertz, Hertz or milliHertz.

Desired Output

Frequency

1 to 999 MHz, kHz,

Hz, mHz,

Select the desired output frequency using units of

MegaHertz, kiloHertz, Hertz or milliHertz.

Phase Increment

Value

— Displays the phase increment value calculated from

the clock rate and desired output frequency.

3-8

Frequency Parameters

UG-NCO

2014.12.15

Altera Corporation

NCO IP Core Functional Description

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