嵌入式相关名词笔记

Mbps, Gbps: 一百万比特每秒,十亿比特每秒
skew:时间偏差,A比B快/慢一秒,就叫skew一秒
PCB:印刷电路板,也就是大多数电路板
IO: 输入输出电路
cable: 线缆
SerDes:串行转并行,并行转串行

 

# CPU 
CU:Control Unit. send need-clac-data -> ALU clac -> get result send back -> to save in memory
ALU:Arithmetic Logic Unit.  Binary clac, such as add/sub/mult(except interger division) 
MMU:Memory Management Unit.  registers like:  MAR MDR PC AC CIR
  • MAR. Memory adress register. save will-be-visited-data 's address
  • MDR. Memory data register. saveor will-write-in-RAM data or from-RAM-data 
  • PC. Program Counter.  save next-exe-instruction 's address
  • AC. Accumulator. save ALU and CU 's middle-result data
  • CIR. Current Instruction Register. save current executing instruction 
 
RAM:"random access memory"
ROM: "read-only memory"
PCI-E:计算机内部的一种高速总线
USB:通用串行总线 Universal Serial Bus
SPI:串行外设接口 Serial Peripheral Interface
I2C:双向同步串行总线 Inter Intergrated CirCUIT bus 内部集成电路总线
GPIO:通用输入输出/总线扩展器 
UART:通用异步收发传输器(协议)
RS232:rs232物理层(接口标准)
 
 
JTAG:联合测试工作组
openOCD :开源片上调试器(rear end)
GDB:GNU调试器(front end),主要调试c/c++程序

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