Figure 39. Input Buffer Areas - ST STM32G4 Series Reference Manual

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Filter Math Accelerator (FMAC)

Figure 39. Input buffer areas

The X1 buffer can be used as a circular buffer, in which case new data are continually

transferred into the input buffer whenever space is available. Pre-loading this buffer is

optional for digital filters, since if no input samples have been written in the buffer when the

operation is started, it is flagged as empty, which will trigger the CPU or DMA to load new

samples until there are enough to begin operation. Pre-loading is nevertheless useful in the

case of a vector operation, that is, the input data is already available in system memory and

circular operation is not required.

RM0440 Rev 1

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