STM32H747AI datasheet(23/252 Pages) STMICROELECTRONICS

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STM32H747xI/G

Functional overview

3.3

Memories

3.3.1

Embedded Flash memory

The STM32H747xI/G devices embed up to 2 Mbytes of Flash memory that can be used for

storing programs and data.

The Flash memory is organized as 266-bit Flash words memory that can be used for storing

both code and data constants. Each word consists of:

•

One Flash word (8 words, 32 bytes or 256 bits)

•

10 ECC bits.

The Flash memory is divided into two independent banks. Each bank is organized as

follows:

•

A user Flash memory block of 512 Kbytes (STM32H7xxxG) or 1-Mbyte (STM32H7xxxI)

containing eight user sectors of 128 Kbytes (4 K Flash memory words)

•

128 Kbytes of System Flash memory from which the device can boot

•

2 Kbytes (64 Flash words) of user option bytes for user configuration

3.3.2

Embedded SRAM

All devices feature around 1 Mbyte of RAM with hardware ECC. The RAM is divided as

follows:

•

512 Kbytes of AXI-SRAM mapped onto AXI bus on D1 domain.

•

SRAM1 mapped on D2 domain: 128 Kbytes

•

SRAM2 mapped on D2 domain: 128 Kbytes

•

SRAM3 mapped on D2 domain: 32 Kbytes

•

SRAM4 mapped on D3 domain: 64 Kbytes

•

4 Kbytes of backup SRAM

The content of this area is protected against possible unwanted write accesses,

and is retained in Standby or VBAT mode.

•

RAM mapped to TCM interface (ITCM and DTCM):

Both ITCM and DTCM RAMs are 0 wait state memories. They can be accessed either

from the Arm® Cortex®-M7 CPU or the MDMA (even in Sleep mode) through a specific

AHB slave of the Cortex®-M7(AHBS):

–

64 Kbytes of ITCM-RAM (instruction RAM)

This RAM is connected to ITCM 64-bit interface designed for execution of critical

real-times routines by the Cortex®-M7.

–

128 Kbytes of DTCM-RAM (2x 64-Kbyte DTCM-RAMs on 2x32-bit DTCM ports)

The DTCM-RAM could be used for critical real-time data, such as interrupt service

routines or stack/heap memory. Both DTCM-RAMs can be used in parallel (for

load/store operations) thanks to the Cortex®-M7 dual issue capability.

The MDMA can be used to load code or data in ITCM or DTCM RAMs.

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