STM32G474XB datasheet(22/232 Pages) STMICROELECTRONICS

22 / 232 page

Functional overview

STM32G474xB STM32G474xC STM32G474xE

22/232

DS12288 Rev 1

FMAC features

•

16 x 16-bit multiplier

•

24+2-bit accumulator with addition and subtraction

•

16-bit input and output data

•

256 x 16-bit local memory

•

Up to three areas can be defined in memory for data buffers (two input, one output),

defined by programmable base address pointers and associated size registers

•

Input and output sample buffers can be circular

•

Buffer “watermark” feature reduces overhead in interrupt mode

•

Filter functions: FIR, IIR (direct form 1)

•

AHB slave interface

•

DMA read and write data channels

3.10

Cyclic redundancy check calculation unit (CRC)

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a

configurable generator with polynomial value and size.

Among other applications, the CRC-based techniques are used to verify data transmission

or storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a mean to verify

the Flash memory integrity.

The CRC calculation unit helps to compute a signature of the software during runtime, which

can be ulteriorly compared with a reference signature generated at link-time and which can

be stored at a given memory location.

3.11

Power supply management

3.11.1

Power supply schemes

The STM32G474xB/xC/xE devices require a 1.71 V to 3.6 V VDD operating voltage supply.

Several independent supplies, can be provided for specific peripherals:

•

VDD = 1.71 V to 3.6 V

VDD is the external power supply for the I/Os, the internal regulator and the system

analog such as reset, power management and internal clocks. It is provided externally

through the VDD pins.

•

VDDA = 1.62 V to 3.6 V (see Section 5: Electrical characteristics for the minimum

VDDA voltage required for ADC, DAC, COMP, OPAMP, VREFBUF operation).

VDDA is the external analog power supply for A/D converters, D/A converters, voltage

reference buffer, operational amplifiers and comparators. The VDDA voltage level is

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