Altera NCO MegaCore Function - Manual (Page 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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