NOR flash devices, available in densities up to 2Gb, are primarily used for reliable code storage (boot, application, OS, and execute-in-place [XIP] code in an embedded system) and frequently changing small data storage. NOR flash provides systems with the fastest bootable memory solution, is easy to implement, and requires minimal ongoing
Serial and Parallel Flash Memory. Flash Memory with Embedded MAC Addresses; SuperFlash® Memory Technology; Getting Started with SuperFlash® Technology; Serial SRAM and Serial NVSRAM. Parallel EEPROM. OTP EPROM. Smart Memory Controllers
The host driver relies on an interface (spi_flash_host_driver_t) defined in the spi_flash_types.h (in the hal/include/hal folder). This interface provides some common functions to communicate with the chip. In other files of the SPI HAL, some of these functions are implemented with existing ESP32 memory-spi functionalities. The ESP32 can talk to an SD card adapter. SD cards use NAND flash, which has a much greater lifespan than NOR and can be safely overwritten many more times (which is why these kinds of cards are usable for filesystems in devices like Raspberry Pis). Writing to flash also takes much more energy than writing to regular RAM. If your device isFlash memory is a solid-state electronic memory storage medium. It enables easy access for users to erase and reprogram data, and is used in a wide range of devices including SD cards and USB sticks, as well as more specialised industrial applications. There are two main types of flash memory – NAND and NOR.
Since we are examining SPI from an attacker’s perspective, we can ignore many of the design considerations taken into account when designing a PCB, such as space and power consumption. A non-exhaustive list of devices commonly built on SPI include some kinds of non-volatile memory (ROM, EEPROM, Flash), LCD displays, and various sensors.hYpLm. 383 481 202 268 231 204 312 278 57