Altera FFT MegaCore Function Manual do Utilizador descarregar pdf (Página 41)

Signal Name Directio

Avalon-ST Type Size Description

source_eop Output endofpacket 1 Marks the end of the outgoing FFT

frame. Only valid when source_valid

is asserted.

source_

error

Output error 2 Indicates an error has occurred either

in an upstream module or within the

FFT module (logical OR of sink_error

with errors generated in the FFT).

source_exp Output data 6 Streaming, burst, and buffered burst

FFTs only. Signed block exponent:

Accounts for scaling of internal signal

values during FFT computation.

source_

imag

Output data (data

precision

width +

growth)

(1)

Imaginary output data. For burst,

buffered burst, streaming, and variable

streaming floating point FFTs, the

output data width is equal to the input

data width. For variable streaming

fixed point FFTs, the size of the output

data is dependent on the number of

stages defined for the FFT and is 2 bits

per radix 2

stage.

source_

ready

Input ready 1 Asserted by the downstream module if

it is able to accept data.

source_

real

Output data (data

precision

width +

growth)

Real output data. For burst, buffered

burst, streaming, and variable

streaming floating point FFTs, the

output data width is equal to the input

data width. For variable streaming

fixed point FFTs, the size of the output

data is dependent on the number of

stages defined for the FFT and is 2 bits

per radix 2

stage. Variable streaming

fixed point FFT only. Growth is log

(N)

+1.

source_sop Output startofpacket 1 Marks the start of the outgoing FFT

frame. Only valid when source_valid

is asserted.

source_

valid

Output valid 1 Asserted by the FFT when there is valid

data to output.

source_

data

Output data Variable In Qsys systems, this Avalon-ST-

compliant data bus includes all the

Avalon-ST output data signals.

Related Information

• Avalon Streaming Interface Specification

• Recommended Design Practices

3-18

FFT IP Core Avalon-ST Signals

UG-FFT

2014.12.15

Altera Corporation

FFT IP Core Functional Description

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