spi sram

Sram,sdram, Nic has address bus. Unified address by CPU.NAND Flash does not have an address bus. So there are different ways of addressing the two.The frame of the character device driver.Drivers 1. There are led.read,led.write,led.open these functions, 2. Defines a struct fileoperation, which includes a. read function that points to led.read. Includes the. Write function that points to led.write, including the. Open function that points to led.open.

From: http://www.cnblogs.com/liugf05/archive/2012/12/03/2800457.html There are two major modules below: One is SPI bus-driven analysis (the specific implementation process is studied) The other is the writing of the SPI bus driver (no need to study the specific implementation process) SPI bus driver analysis 1 SPI Ove

1. Flash can be divided into two types: NOR flash and NAND flash, depending on the internal storage structure. Nor flash: Like access to SDRAM, according to the data/address bus direct access, can write less and slower, because its reading time is similar to SRAM, read address is a linear structure, more for program code storage. NAND Flash: Only 8-bit/16-bit/32-bit or more bit-wide bus, each access, the long address is divided into several parts, a l

Linux Kernel SPI subsystem architecture analysis (clear) There are two types of equipment on the SPI bus: one is the main control end, which is usually used as a sub-module of the SoC system. For example, many embedded mpus usually contain SPI modules. One is the controlled end, such as flash and sensors of some SPI in

Differences: SPI: high-speed synchronous serial port. 3 ~ 4-line interface, independent and synchronous sending and receiving UART: Universal asynchronous serial port. Bidirectional communication based on the standard baud rate is slow I2C: A three-line serial transmission mode. The communication protocol and usage can be found on the Internet. Bidirectional data transmission with three linesSerial peripheral interfaceUART: Universal asynchronous tra

Flash has the characteristics of power-down data storage. If Ram power-down occurs, data is lost, but Ram speed is higher. Theoretically, there is no limit on the number of writes, But Flash does not.Compared with other types of flash, NAND Flash has the advantage of high erasability and high write speed. However, Bad blocks may occur during use and use.Can be used only after processing. It is mainly used for data storage, and most USB flash drives are NAND Flash.Nor flash read/write timing is s

I. Overview Developing Drivers Based on subsystems is a common practice in Linux kernel. I have previously written about driver development based on the I2C subsystem. This article introduces another common bus SPI development method. The development of the SPI subsystem has many similarities with I2C, so you can compare and learn. This topic is divided into two parts. The first part introduces the theoreti

Purpose of study: (1) familiar with SPI interface and its read-write timing;(2) Review the $READMEMB command and $display command in the Verilog simulation statement;(3) Mastering the SPI Interface write sequential operation of the hardware language description process (in this case only write timing for example), for the later description of more complex sequential logic circuit lay the foundation.Learning

MSM8909 + Android5.1.1 SPI driver development (PSAM part) MSM8909 + Android5.1.1SPI driver development (PSAM part) 1. PSAM Hardware Design Figure 1 CS chip selection Signal SCK clock signal Data input from the MISO master device and output from the device Data output from the MOSI master device and input from the device 2. PSAM Software Design Figure 2 (1) PSAM Application You only need to call the API function. (2) PSAM API The main task of t

SPI is a "serial peripheral Interface" abbreviation, is a four-wire synchronous serial communication interface, used to connect microcontrollers, sensors, storage devices, SPI equipment divided into the main equipment and two from the device, the four lines for communication and control are: The CS chip chooses the signal SCK the clock signal MISO The main equipment The data input, from the device's data ou

SPI is a "serial peripheral Interface" abbreviation, is a four-wire synchronous serial communication interface, used to connect microcontrollers, sensors, storage devices, SPI equipment divided into the main equipment and two from the device, the four lines for communication and control are: The CS chip chooses the signal SCK the clock signal MISO The main equipment The data input, from the device's data ou

About I2C and SPI bus protocols Iicvs SPI Currently, in the low-end digital communication application field, we can see IIC (Inter-Integrated Circuit) and SPI (serial peripheral interface) everywhere. The reason is that these two communication protocols are very suitable for close-range and low-speed chip communication. Philips (for IIC) and Motorola (for

Bus Technology2010-01-15 17:14:34 Read282 Comment0 Font Size:LargeMediumSmallSubscription Classification: embedded multi-media 1. SPI protocol Overview SPI, short for serial peripheral interface, is a serial peripheral interface. Motorola first defined it on its mc68hcxx series processor. The SPI interface is mainly

Stm32--spi InterfaceTenet: The learning of technology is limited and the spirit of sharing is limitless.First, SPI Agreement " serialperipheral Interface "Serial Peripheral interface, is a high-speed full-duplex communication bus. Communication between ADC/LCD and MCU.1 , SPI Signal LineThe SPI contains 4 buses, and th

Transferred from: http://blog.csdn.net/droidphone/article/details/23367051/Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Directory (?) [-] Hardware structure Working time series Software architecture SPI Controller Driver SPI Universal Interface Package layer SPI