Altera FFT MegaCore Function Manual do Utilizador descarregar pdf (Página 33)

Figure 3-7: Dynamically Changing the FFT Size

clock

reset_n

sink_valid

sink_ready

sink_sop

sink_eop

inverse

sink_real

sink_imag

source_real

source_imag

source_ready

source_valid

source_sop

source_eop

fftps

1. Change the size of the incoming FFT,

I/O Order

The I/O order determines order of samples entering and leaving the FFT and also determines if the FFT is

operating in engine-only mode or engine with bit-reversal or digit-reversal mode.

If the FFT operates in engine-only mode, the output data is available after approximately N + latency

clocks cycles after the first sample was input to the FFT. Latency represents a small latency through the

FFT core and depends on the transform size. For engine with bit-reversal mode, the output is available

after approximately 2N + latency cycles.

Figure 3-8: Data Flow—Engine-Only Mode

clk

reset_n

sink_valid

sink_ready

sink_sop

sink_eop

sink_real

sink_imag

source_real

source_imag

source_valid

source_sop

source_eop

3-10

I/O Order

UG-FFT

2014.12.15

Altera Corporation

FFT IP Core Functional Description

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