2012年3月27日 星期二

第四週 Chp:4 系統單元的組成元件

Clock Speed
Clock frequency (also translated: clock speed, English: clock rate) is the fundamental frequency of the clock refers to the synchronization circuit to measure a number of cycles per second, unit of measurement to SI unit hertz (Hz)
For example, from the crystal base frequency is usually equal to a fixed sinusoidal waveform, the clock frequency is the base frequency, electronic circuits converted digital electronic devices into the corresponding square wave pulse. Need to add a little "speed" as a vector should not be scalar "frequency" confused, so use the "clock speed" to describe this concept is a misnomer.
In a single clock cycle (the time of modern embedded microprocessors are generally shorter than a nanosecond) the logic zero state and the logic state to switch back and forth. Due to the limitations of heat and power specifications, the cycle duration of the logic zero state has always been longer than the logic state.
時鐘頻率(又譯:時鐘速度,英語:時鐘速率)是基本時鐘頻率是指同步電路來衡量一個每秒的週期數,單位的測量SI單位赫茲(赫茲)
例如,從晶體基頻通常是等於一個固定的正弦波,時鐘頻率是基頻,電子電路轉換成相應的方波脈衝的數字電子設備。需要添加一點點的“速度作為載體,不應該標“頻率”混淆所以使用時鐘速度來形容這個概念是一種誤導。
在一個時鐘週期(現代嵌入式微處理器的時間一般較短的不足一納秒)零的邏輯狀態和邏輯狀態來回切換。由於熱量功率規格的限制,一直邏輯零狀態的週期時間長於邏輯狀態

沒有留言:

張貼留言