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Ixiasoft
3.6.2.1. Component Specific Signals
The component specific signals.
Signal Name | Direction | Size | Description |
---|---|---|---|
fftpts_in | Input | log2(maximum number of points) | The number of points in this FFT frame. If you do not specify this value, 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. Always drive fftpts_in even if you are not dynamically changing the block size. For a fixed implementation drive it to match the transform length in the parameter editor. |
fftpts_out | Output | log2(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.
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. |
Unexpected EOP | 11 | Asserted if EOP is asserted before N valid samples are accepted. |