2.3.3

　　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 signature of

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

　　time and stored at a given memory location.

　　2.3.4

　　Embedded SRAM

　　Up to 64 Kbytes of embedded SRAM accessed (read/write) at CPU clock speed with 0 wait

　　states.

　　2.3.5

　　FSMC (flexible static memory controller)

　　The FSMC is embedded in the STM32F103xC, STM32F103xD and STM32F103xE

　　performance line family. It has four Chip Select outputs supporting the following modes: PC

　　Card/Compact Flash, SRAM, PSRAM, NOR and NAND.

　　Functionality overview:

　　<

　　The three FSMC interrupt lines are ORed in order to be connected to the NVIC

　　<

　　Write FIFO

　　<

　　Code execution from external memory except for NAND Flash and PC Card

　　<

　　The targeted frequency, fCLK, is HCLK/2, so external access is at 36 MHz when HCLK

　　is at 72 MHz and external access is at 24 MHz when HCLK is at 48 MHz