最新嵌入式系統|常用詞匯表1

CPU（中央處理器）
Central Processing Unit. The part of a processor that executes instructions.
中央處理器。處理器中執行指令的那一部分。

Compiler（編譯器）
A software development tool that translates high-level language programs into the machine-language instructions that a particular processor can understand and execute. 
把高級編程語(yǔ)言程序轉換到只有特定的處理器能了解和執行的機器指令的一種軟件開(kāi)發(fā)包。

context （上下文）
The current state of the processor"s registers and flags.
處理器當前的狀態(tài)和標志。

context switch（上下文切換）
The process of switching from one task to another in a multitasking operating system. A context switch involves saving the context of the running task and restoring the previously-saved context of the other. The piece of code that does this is necessarily processor-specific.
在多任務(wù)操作系統中我一個(gè)任務(wù)切換到另一個(gè)的過(guò)程。上下文切換包括保存正在運行的任務(wù)的上下文和恢復早先保存的另一個(gè)任務(wù)的上下文。做這個(gè)工作的一段代碼必須具有處理器特權。

counting semaphore（計數信號）
A type of semaphore that is used to track multiple resources of the same type. An attempt to take a counting semaphore is blocked only if all of the available resources are in use. Contrast with binary semaphore.
一種用來(lái)跟蹤多個(gè)相同類(lèi)型資源的信號燈。僅僅在所有可用的資源都被用完了時(shí)才阻塞。相對二元信號而言。

critical section（臨界段）
A block of code that must be executed in sequence and without interruption to guarantee correct operation of the software. See also race condition. 
一段必須按次序執行的代碼，并且不能被中斷，否則不能保證軟件正確地操作。參照：競爭狀況。

cross-compiler（交叉編譯器）
 A compiler that runs on a different platform than the one for which it produces object code. A cross-compiler runs on a host computer and produces object code for the target.
一個(gè)運行在不同的平臺上的編譯器，其中之一能產(chǎn)生目標代碼。交叉編譯器在主機上運行并且產(chǎn)生目標機的目標代碼。

D
DMA（直接內存訪(fǎng)問(wèn)）
Direct Memory Access. A technique for transferring data directly between two peripherals (usually memory and an I/O device) with only minimal intervention by the processor. DMA transfers are managed by a third peripheral called a DMA controller. 
直接內存訪(fǎng)問(wèn)。一種直接在兩個(gè)外設（通常是內存和I/O設備）之間進(jìn)行數據傳輸的技術(shù)，它只要處理器最少的介入。DMA傳輸由叫DMA控制器的第三方外設進(jìn)行管理。

DRAM（動(dòng)態(tài)隨機訪(fǎng)問(wèn)存儲器）
Dynamic Random-Access Memory. A type of RAM that maintains its contents only as long as the data stored in the device is refreshed at regular intervals. The refresh cycles are usually performed by a peripheral called a DRAM controller.
動(dòng)態(tài)隨機訪(fǎng)問(wèn)存儲器。一種RAM，存儲在其設備中的數據被定期刷新時(shí)才能保存它的內容。刷新周期一般由一個(gè)叫DRAM控制器的外設完成。

Data bus（數據總線(xiàn)）
A set of electrical lines connected to the processor and all of the peripherals with which it communicates. When the processor wants to read (write) the contents of a memory location or register within a particular peripheral, it sets the address bus pins appropriately and receives (transmits) the contents on the data bus. 
連接處理器與所有外設進(jìn)行通訊的電子線(xiàn)路集。當一個(gè)處理器想去寫(xiě)（讀）某一特定外設中的存儲器地址或寄存器中的內容時(shí)，處理器設置地址總線(xiàn)并在數據總線(xiàn)上接收（傳輸）內容。

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