Contents
What is sector size in Flash?
Each sector has 256 pages or 65,536 (64K, 0x10000) bytes. Each page has 256 bytes. Therefore, the memory has 16,384 pages or 4,194,304 (0x400000) bytes. The whole memory can be erased using the Bulk Erase instruction, or a sector at a time, using the Sector Erase instruction.
What is page sector in Flash memory?
Flash memory is organised into x-number of blocks (or sectors), themselves of which are split into y-number of pages. As you have found, Flash can only be erased a block at at time, but can be written to a page at a time and sometimes finer.
What is dual bank flash memory?
The dual bank Flash memory allows a code to be executed in one bank, while another bank is being erased or programmed. It avoids a CPU stalling during programming operations and protects the system from power failures or other errors.
What is Flash in STM32?
Flash memory is a non-volatile storage medium that can be electrically erased and reprogrammed. In most of the STM32 devices, NOR flash is used because of its suitability in embedded applications.
What is SPI ROM?
SPI Flash memory, also known as Flash storage, has become widespread in the embedded industry and is commonly used for storage and data transfers in portable devices. Common devices include phones, tablets, and media players, as well as industrial devices like security systems and medical products.
What is unique about flash memory?
Flash memory has many features. It is a lot less expensive than EEPROM and does not require batteries for solid-state storage such as static RAM (SRAM). It is non-volatile, has a very fast access time and has a higher resistance to kinetic shock compared to a hard disc drive.
What’s the difference between flash memory and SSD?
Flash is a form of non-volatile, high-speed read and write media that holds digital data. While SSD is a type of hard disk that instead of using magnetic media to write, store and read data uses a form of Flash memory.
What is Eeprom emulation?
EEPROM emulation techniques and software for. STM32 microcontrollers. Introduction. EEPROMs (electrically erasable programmable read-only memories) are used for non- volatile storage of updatable application data, or to retain small amounts of data in the event of power failure in complex systems.
Why do we use sectors instead of pages in STM32F7?
The concept is the same, between page and sectors. STM32F7 documentation uses the sector term because they are much bigger than the typical pages in external flash memory. But it doesn’t matter. So, you can’t find reference to pages because what you called pages are here called sectors.
How much memory is in a STM32F7 microcontroller?
STM32F7 microcontrollers embed up to 2 Mbytes of Flash memory. The Flash memory interface manages all memory access (read, programming and erasing) as well as memory protection and option bytes. Applications using this Flash memory interface benefit from its high performance together with low-power access.
How big is an erase block on STM32F7?
$begingroup$ AFAIK STM32F7 has a 100k endurance on the flash (2MiB total). Also the erase block size is 128KiB (with the right configuration, and from ~256KiB upwards), while it can be 8 byte written (as opposed to ~256 bytes on external flash). Saving settings or alike can save you from extra hardware components.
How to activate dual bank flash memory on STM32F7?
When the STM32F7 Series device is in the dual bank mode (nDBANK =0) the application software can either boot from bank 1 or from bank 2. The dual boot Flash memory mode is activated by setting nDBOOT = 0 in user option bytes via the FLASH_OPTCR register. Figure 9 describes how the dual boot mode is activated at register level.