RM0440 Rev 4 489/2126
RM0440 Filter math accelerator (FMAC)
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Figure 42. 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 triggers 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.
x2_base
x2_buf_size
x1_base
x1_buf_size
X1 buffer X2 buffer
MSv45869V1
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