spi sram

The current work is mainly in the RDA5981 platform for product development and design, in the design process to contact the SRAM, Psram and SPI Flash, so take this opportunity to collate the relevant knowledge.The following is a messy, mainly recorded the concept of SRAM, PSRAM, DRAM, SDRAM and the introduction of PSRAM, and the

Source: External SRAM experiment, allowing STM32 external SRAM operations to be the same as internal SRAMA few days ago to see Open source Electronic forum (openedv.com) Someone asked this question, I deliberately to do this experiment, so with the external SRAM with internal SRAM, do not have to apply for memory, and

SPI interface SPI interface IntroductionSPI is a synchronous serial transmission specification released by Motorola. It is often used as a serial expansion interface for MCU peripheral chip. SPI has four pins: SS (from device Selection Line), SDO (serial data output line), SDI (serial data input line), and sck (synchronous serial clock line ).

Through the introduction of the previous article, we know that the SPI Universal interface layer is used to connect the specific SPI device protocol driver and SPI Controller driver, the general interface layer in addition to the protocol driver and controller driver to provide a series of standard interface APIs, but also for these interface API defines the corr

DRAM, Dynamic Random Access Memory, must be constantly refreshed to save data. In addition, the row and column addresses are reused, and many of them have the page mode.SRAM, static random access memory. When powered on, data does not need to be refreshed, and data will not be lost. In addition, it is generally not reused by row and column addresses. SDRAM, synchronous DRAM, that is, data read/write requires clock synchronization.DRAM and SDRAM have a large capacity due to technical issues. Howe

Rom and RAM are both semiconductor memory, Rom is short for read only memory, and Ram is short for random access memory. ROM can still maintain data when the system stops power supply, while Ram usually loses data after power loss. A typical Ram is the computer memory.Ram has two categories: static RAM (static RAM/SRAM ), The fast speed of SRAM is the fastest read/write storage device. But it is also very e

Through the first article, we already know that the whole SPI drive architecture can be divided into three parts: Protocol driver, general interface layer and controller driver. The controller driver is responsible for the data sending and receiving work at the lowest level, in order to complete the data sending and receiving work, the controller driver needs to complete the following functions:1. Request the necessary hardware resources, such as inte

IICVsSPIToday, in low-end digital communications applications, we are seen in IIC (inter-integrated circuit) and SPI (Serial peripheral Interface). The reason is that these two communication protocols are ideal for near- low-speed inter-chip communication. Philips (for IIC) and Motorola (for SPI) have developed both standard communication protocols for different backgrounds and market requirements.IIC was d

1 SRAM Read-Write timing interpretation Memory is overwhelming, and is the size of the computer system (including embedded systems) is not a small part. It is no exaggeration to say that there must be a data transfer process where there is memory, whether it is embedded in the CPU or plug-in, in the code store or program running when it must be necessary. In this section, the experimental object SRAM (Stat

MCU simulation SPI interface-deep understanding of SPI bus protocol SPI (serial peripheral interfacer serial peripheral interface) is a synchronous serial communication interface launched by Motorola, the serial connection between the microprocessor compaction controller and the peripheral extended chip has developed into an industrial standard. Currently, variou

circuit circuit, while the module PIN is often said "golden finger" . The Simm:sigle in-line memory Module, a single-column RAM module. Memory module is what we often say the memory, the so-called single-column refers to the module board and the motherboard socket interface only one row of pins (although both sides have gold fingers). dimm:double in-line Memory module, dual-row RAM module. Is our common module type, the so-called dual-column refers to the interface between the module boa

RAM (Random Access memory). The contents of the storage unit can be withdrawn or deposited as required, and the speed of access is independent of the location of the memory unit. This memory loses its stored content when it loses power, so it is mainly used to store short-time use programs. According to the different storage information, the random memory is divided into static random memory (Ram,sram) and dynamic random memory (Ram,dram).ROM (Read-on

about the SRAM , DRAM , SDRAMSRAM : Static random memory, do not need to refresh the circuit, which makes static RAM faster than dynamic RAM, but, because he contains more devices, low integration, not suitable for large capacity of memory, generally used in the processor's cache, SRAM speed is very fast, In the fast read and refresh to ensure data integrity, SRAM