Datasheet

Functional overview STM32F401xD STM32F401xE
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3.4 Embedded Flash memory
The devices embed 512 Kbytes of Flash memory available for storing programs and data.
3.5 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.
3.6 Embedded SRAM
All devices embed:
• 96 Kbytes of system SRAM which can be accessed (read/write) at CPU clock speed
with 0 wait states
3.7 Multi-AHB bus matrix
The 32-bit multi-AHB bus matrix interconnects all the masters (CPU, DMAs) and the slaves
(Flash memory, RAM, AHB and APB peripherals) and ensures a seamless and efficient
operation even when several high-speed peripherals work simultaneously.
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