STM32F217VG datasheet(18/173 Pages) STMICROELECTRONICS

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Description

STM32F21xxx

18/173

Doc ID 17050 Rev 8

2.2.5

CRC (cyclic redundancy check) calculation unit

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code from a 32-bit

data word and a fixed generator polynomial.

Among other applications, 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 means of

verifying the Flash memory integrity. The CRC calculation unit helps compute a software

signature during runtime, to be compared with a reference signature generated at link-time

and stored at a given memory location.

2.2.6

Embedded SRAM

All STM32F21x products embed:

●

Up to 128 Kbytes of system SRAM accessed (read/write) at CPU clock speed with 0

wait states

●

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.

2.2.7

Multi-AHB bus matrix

The 32-bit multi-AHB bus matrix interconnects all the masters (CPU, DMAs, Ethernet, USB

HS) and the slaves (Flash memory, RAM, FSMC, AHB and APB peripherals) and ensures a

seamless and efficient operation even when several high-speed peripherals work

simultaneously.

Figure 5.

Multi-AHB matrix

ARM

Cortex-M3

DMA1

DMA2

MAC

Ethernet

USB OTG

Bus matrix-S

ICODE

DCODE

Flash

memory

SRAM

112 Kbyte

SRAM

16 Kbyte

AHB1

periph

AHB2

periph

FSMC

Static MemCtl

ai15963c

APB1

APB2

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