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Component Specific Signals

The component specific signals.

Table 3-7: Component Specific Signals

Signal Name Directio

Size Description

fftpts_

Input log

(maximum

number of

points)

The number of points in this FFT frame. If this value is not

specified, the FFT can not be a variable length. The default

behavior is for the FFT to have fixed length of maximum

points. Only sampled at SOP.

fftpts_

out

Output log

(maximum

number of

points)

The number of points in this FFT frame synchronized to

the Avalon-ST source interface. Variable streaming only.

inverse Input 1 Inverse FFT calculated if asserted. Only sampled at SOP.

Incorrect usage of the Avalon-ST interface protocol on the sink interface results in a error on

source_error. Table 3-8 defines the behavior of the FFT when an incorrect Avalon-ST transfer is

detected. If an error occurs, the behavior of the FFT is undefined and you must reset the FFT with

reset_n.

Table 3-8: Error Handling Behavior

Error source_

error

Description

Missing

SOP

01 Asserted when valid goes high, but there is no start of frame.

Missing

EOP

10 Asserted if the FFT accepts N valid samples of an FFT frame, but there

is no EOP signal.

Unexpecte

d EOP

11 Asserted if EOP is asserted before N valid samples are accepted.

FFT IP Core Signals in Qsys Systems

When you instantiate your design in a Qsys sytem and target Arria 10 devices, the signals appear as a

single bus:

• In:

• Real

• Imaginary

• Out:

• Real

• Imaginary

UG-FFT

2014.12.15

Component Specific Signals

3-19

FFT IP Core Functional Description

Altera Corporation

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