STM32G474CB datasheet(21/232 Pages) STMICROELECTRONICS

21 / 232 page

DS12288 Rev 1

21/232

STM32G474xB STM32G474xC STM32G474xE

Functional overview

3.8

CORDIC

The CORDIC provides hardware acceleration of certain mathematical functions, notably

trigonometric, commonly used in motor control, metering, signal processing and many other

applications.

It speeds up the calculation of these functions compared to a software implementation,

allowing a lower operating frequency, or freeing up processor cycles in order to perform

other tasks.

Cordic features

•

24-bit CORDIC rotation engine

•

Circular and Hyperbolic modes

•

Rotation and Vectoring modes

•

Functions: Sine, Cosine, Sinh, Cosh, Atan, Atan2, Atanh, Modulus, Square root,

Natural logarithm

•

Programmable precision up to 20-bit

•

Fast convergence: 4 bits per clock cycle

•

Supports 16-bit and 32-bit fixed point input and output formats

•

Low latency AHB slave interface

•

Results can be read as soon as ready without polling or interrupt

•

DMA read and write channels

3.9

Filter mathematical accelerator (FMAC)

The filter mathematical accelerator unit performs arithmetic operations on vectors. It

comprises a multiplier/accumulator (MAC) unit, together with address generation logic,

which allows it to index vector elements held in local memory.

The unit includes support for circular buffers on input and output, which allows digital filters

to be implemented. Both finite and infinite impulse response filters can be realized.

The unit allows frequent or lengthy filtering operations to be offloaded from the CPU, freeing

up the processor for other tasks. In many cases it can accelerate such calculations

compared to a software implementation, resulting in a speed-up of time critical tasks.

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