s3c2440英文手册

s3c2440英文手册 INTRODUCTION This user’s manual describes SAMSUNG's S3C2440A 16/32-bit RISC microprocessor. SAMSUNG’s S3C2440A is designed to provide hand-held devices and general applications with low-power, and high-performance micro-controller solution in small die size. To reduce total system cost, the S3C2440A includes the following components. The S3C2440A is developed with ARM920T core, 0.13um CMOS standard cells and a memory complier. Its low-power, simple, elegant and fully static design is particularly suitable for cost- and power-sensitive applications. It adopts a new bus architecture known as Advanced Micro controller Bus Architecture (AMBA). The S3C2440A offers outstanding features with its CPU core, a 16/32-bit ARM920T RISC processor designed by Advanced RISC Machines, Ltd. The ARM920T implements MMU, AMBA BUS, and Harvard cache architecture with separate 16KB instruction and 16KB data caches, each with an 8-word line length. By providing a complete set of common system peripherals, the S3C2440A minimizes overall system costs and eliminates the need to configure additional components. The integrated on-chip functions that are described in this document include: · Around 1.2V internal, 1.8V/2.5V/3.3V memory, 3.3V external I/O microprocessor with 16KB I-Cache/16KB D-Cache/MMU · External memory controller (SDRAM Control and Chip Select logic) · LCD controller (up to 4K color STN and 256K color TFT) with LCD-dedicated DMA · 4-ch DMA controllers with external request pins · 3-ch UARTs (IrDA1.0, 64-Byte Tx FIFO, and 64-Byte Rx FIFO) · 2-ch SPls · IIC bus interface (multi-master support) · IIS Audio CODEC interface · AC’97 CODEC interface · SD Host interface version 1.0 & MMC Protocol version 2.11 compatible · 2-ch USB Host controller / 1-ch USB Device controller (ver 1.1) · 4-ch PWM timers / 1-ch Internal timer / Watch Dog Timer · 8-ch 10-bit ADC and Touch screen interface · RTC with calendar function · Camera interface (Max. 4096 x 4096 pixels input support. 2048 x 2048 pixel input support for scaling) · 130 General Purpose I/O ports / 24-ch external interrupt source · Power control: Normal, Slow, Idle and Sleep mode · On-chip clock generator with PLL

uboot代码详细分析

uboot代码详细分析 u-boot-1.1.6 之cpu/arm920t/start.s分析 .................................................. u-boot中.lds 连接脚本文件的分析 ............................................................ 分享一篇我总结的uboot 学习笔记（转） .............................................. U-BOOT内存布局及启动过程浅析 ............................................................ u-boot中的命令实现 ................................................................................... U-BOOT环境变量实现 ................................................................................. 1.相关文件 ............................................................................................. 2.数据结构 ............................................................................................. 3.ENV 的初始化.................................................................................... 3.1env_init ..................................................................................... 3.2 env_relocate ............................................................................

Makefile 语法分析

makefile 实例分析 Makefile 语法分析 第一部分 VERSION = 2# 给变量VERSION赋值 PATCHLEVEL = 6# 给变量PATCHLEVEL赋值 SUBLEVEL = 22# 给变量SUBLEVEL赋值 EXTRAVERSION = .6# 给变量EXTRAVERSION赋值 NAME = Holy Dancing Manatees, Batman!# 给变量NAME赋值 # *DOCUMENTATION*# To see a list of typical targets execute "make help"# More info can be located in ./README# Comments in this file are targeted only to the developer, do not# expect to learn how to build the kernel reading this file. # Do not:# o use make's built-in rules and variables#    (this increases performance and avoid hard-to-debug behavour);# o print "Entering directory ...";MAKEFLAGS += -rR --no-print-directory# 操作符“+=”的作用是给变量（“+=”前面的MAKEFLAGS）追加值。# 如果变量（“+=”前面的MAKEFLAGS）之前没有定义过，那么，“+=”会自动变成“=”；# 如果前面有变量（“+=”前面的MAKEFLAGS）定义，那么“+=”会继承于前次操作的赋值符；# 如果前一次的是“:=”，那么“+=”会以“:=”作为其赋值符# 在执行make时的命令行选项参数被通过变量 “MAKEFLAGS”传递给子目录下的make程序。# 对于这个变量除非使用指示符“unexport”对它们进行声明，它们在整个make的执行过程中始终被自动的传递给所有的子make。# 还有个特殊变量SHELL与MAKEFLAGS一样，默认情况（没有用“unexport”声明）下在整个make的执行过程中被自动的传递给所有的子make。

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