Sophy's Notebook

http://en.wikipedia.org/wiki/Clock_gating

Clock gating is one of the power-saving techniques used on many synchronous circuits including the Pentium 4 processor. To save power, clock gating support adds additional logic to a circuit to prune the clock tree, thus disabling portions of the circuitry so that its flip-flops do not change state: their switching power consumption goes to zero, and only leakage currents are incurred.

Although asynchronous circuits by definition do not have a "clock", the term perfect clock gating is used to illustrate how various clock gating techniques are simply approximations of the data-dependent behavior exhibited by asynchronous circuitry. As the granularity on which you gate the clock of a synchronous circuit approaches zero, the power consumption of that circuit approaches that of an asynchronous circuit: the circuit only generates logic transitions when it is actively computing.

Chip families such as OMAP3, with a cell phone heritage, support several forms of clock gating. At one end is manual gating of clocks by software, where a driver enables or disables the various clocks used by a given idle controller. On the other end is automatic clock gating, where the hardware can be told to detect whether there's any work to do, and turn off a given clock if it isn't needed. These modes interact. For example, an internal bridge or bus might use automatic gating so that it's gated off until the CPU or a DMA engine needs to use it.

http://fund.bot.com.tw/z/glossary/glexp_2641.asp.htm

ASIC　特殊應用IC。

表一： 國際單位字首^a

http://zh.wikipedia.org/w/index.php?title=%E5%8D%B0%E5%88%B7%E7%94%B5%E8%B7%AF%E6%9D%BF&variant=zh-hant

// Wikipedia

印刷電路板，又稱印製電路板，印刷線路板，常使用英文縮寫PCB（Printed circuit board）或寫PWB（Printed wire board），是重要的電子部件，是電子元件的支撐體，是電子元器件線路連接的提供者。傳統的電路板，採用印刷蝕刻阻劑的工法，做出電路的線路及圖面，因此被稱為印刷電路板或印刷線路板。由於電子產品不斷微小化跟精細化，目前大多數的電路板都是採用貼附蝕刻阻劑(壓膜或塗佈)，經過曝光顯影後，再以蝕刻做出電路板。

http://www.ledinside.com.tw/led_power_n_table

LEDinside為各位關心LED產業的人士整理了LED中英文常用辭彙對照表，前次推出的是LED中英文常用辭彙對照表之PCB相關術語，這次推出的是電路相關術語的中英對照。

以下是常用的相關術語表：

背板 backplane

http://www.ledinside.com.tw/led_pcb_n_table

LEDinside為各位關心LED產業的人士整理了LED中英文常用辭彙對照表，首先推出的是PCB相關術語的中英對照。

以下是常用的相關術語表：

板 board
母板 mother board