Altera FFT MegaCore Function Manuel d'utilisateur télécharger pdf (Page 29)

Figure 3-3: FFT Streaming Data Flow Simulation Waveform

clk

reset_n

sink_valid

sink_ready

sink_sop

sink_eop

inverse

sink_real

sink_imag

source_real

source_imag

source_exp

source_ready

source_valid

source_sop

source_eop

EXP0

EXP1

EXP2

EXP3

When the final sample loads, the source asserts sink_eop and sink_valid for the last data transfer.

Figure 3-4: FFT Streaming Data Flow Input Flow Control

clk

reset_n

sink_valid

sink_ready

sink_sop

inverse

sink_real

sink_imag

(0)

(1)

(2)

(3) x

(4)

(5)

(6)

(7)

(0)

(1) x

(2) x

(3) x

(4)

(5)

(6)

(7)

1. Deassert the system reset, The data source asserts sink_valid to indicate to the FFT function that

valid data is available for input.

2. Assert both the sink_valid and the sink_ready for a successful data transfer.

Related Information

Avalon Interface Specifications

Changing the Direction on a Block-by-Block Basis

1. Assert or deassert inverse (appropriately) simultaneously with the application of the sink_sop pulse

(concurrent with the first input data sample of the block).

3-6

Changing the Direction on a Block-by-Block Basis

UG-FFT

2014.12.15

Altera Corporation

FFT IP Core Functional Description

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Altera FFT MegaCore Function Manuel d'utilisateur Page 29

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