How does SPI Flash work?
The SPI flash is connected to an SPI unit of the CPU via CLK, MOSI, MISO, nCS pins. This is the minimum connection needed to store data on the SPI flash and get data from it. This connection actually works with any CPU that provides an SPI unit.
What is microcontroller flash memory?
A microcontroller typically has 3 types of memory: Flash, RAM, and EEPROM. Flash is a type of nonvolatile memory; that is, it’s a memory that keeps the information transferred to it even when the power to the microcontroller is shut off.
What is SPI NOR flash?
SPI NOR flash memory chips are organized into sectors and pages. A sector is defined as the smallest erasable block size. Sectors can be subdivided into pages. Data can be written in page-size chunks, even though pages tend to be far smaller than sectors.
What is SPI NAND flash?
SPI (Serial Peripheral Interface) NAND Flash provides an ultra cost-effective while high density non-volatile memory storage solution for embedded systems, based on an industry-standard NAND Flash memory core.
What is SPI microcontroller?
Serial peripheral interface (SPI) is one of the most widely used interfaces between microcontroller and peripheral ICs such as sensors, ADCs, DACs, shift registers, SRAM, and others.
How does SPI work in microcontroller?
Serial Peripheral Interface (SPI) is an interface bus commonly used to send data between microcontrollers and small peripherals such as shift registers, sensors, and SD cards. It uses separate clock and data lines, along with a select line to choose the device you wish to talk to.
Is SPI Flash NAND or NOR?
SPI flash media, both NAND and NOR, requires only eight traces to the processor – an equivalent parallel solution can require twenty-three. In addition to reducing the number of traces, these devices take up considerably less space on the PCB.
How many devices can be connected to SPI?
Two lines gets up to 128 devices (though also bus C limited).
What is the disadvantage of SPI?
Disadvantages of using SPI Short transmission distance. There is no flow control specified, and no acknowledgement mechanism confirms whether data is received, unlike I2C. More Pin ports are occupied, the practical limit to the number of devices. No form of error check unlike in UART (using parity bit).
How does SPI chip select work?
The chip select signal from the main is used to select the subnode. This is normally an active low signal and is pulled high to disconnect the subnode from the SPI bus. When multiple subnodes are used, an individual chip select signal for each subnode is required from the main.
How many devices can be connected in SPI?
Is flash memory the same as SSD?
Because it uses integrated circuit technology, flash storage is a solid-state technology, meaning it has no moving parts. When flash technology is used for enterprise storage, the term flash drive or flash array is often used interchangeably with solid-state drive (SSD).
What is a NOR chip?
NOR flash memory is one of the two popular types of flash memory. The other is the newer NAND flash memory. Flash memory is non-volatile computer memory that can be electrically erased and reprogrammed. Non-volatile means that no power is needed to maintain the information stored on the chip.
How fast can SPI transfer data?
60 Mbps
The SPI bus can run at high speed, transferring data at up to 60 Mbps over short distances like between chips on a board. The bus is conceptually simple, consisting of a clock, two data lines, and a chip select signal.
What devices use SPI?
SPI is a common communication protocol used by many different devices. For example, SD card reader modules, RFID card reader modules, and 2.4 GHz wireless transmitter/receivers all use SPI to communicate with microcontrollers.