STM32H723VG datasheet(24/227 Pages) STMICROELECTRONICS

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Functional overview

STM32H723xE/G

24/227

DS13313 Rev 2

3.6

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.

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

3.7

Power supply management

3.7.1

Power supply scheme

STM32H723xE/G power supply voltages are the following:

•

VDD = 1.62 to 3.6 V: external power supply for I/Os, provided externally through VDD

pins.

•

VDDLDO = 1.62 to 3.6 V: supply voltage for the internal regulator supplying VCORE

•

VDDA = 1.62 to 3.6 V: external analog power supplies for ADC, DAC, COMP and

OPAMP.

•

VDD33USB: allows the support of a VDD supply different from 3.3 V while powering the

USB transceiver with 3.3V on VDD33USB.

•

VBAT = 1.2 to 3.6 V: power supply for the VSW domain when VDD is not present.

•

VCAP: VCORE supply voltage, which values depend on voltage scaling (1.0 V, 1.1 V,

1.2 V or 1.35 V). They are configured through VOS bits in PWR_D3CR register. The

VCORE domain is split into the following power domains that can be independently

switch off.

–

D1 domain containing some peripherals and the Cortex®-M7 core

–

D2 domain containing a large part of the peripherals

–

D3 domain containing some peripherals and the system control

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