計(jì)算機(jī)學(xué)科基礎(chǔ)ppt課件-資料下載頁(yè)
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【正文】 ted by a few more input signals, called select signals or select control lines – 多路復(fù)用器根據(jù)稱(chēng)為選擇信號(hào)或者選擇控制線的輸入信號(hào)選擇用哪個(gè)輸入信號(hào)作為輸出信號(hào) 4–34 Multiplexers 多路復(fù)用器 ? The control lines S0, S1, and S2 determine which of eight other input lines (D0 through D7) are routed to the output (F) Figure A block diagram of a multiplexer with three select control lines Page 105 4–35 Circuits as Memory 存儲(chǔ)器電路 ? Digital circuits can be used to store information 數(shù)字電路可以用來(lái)存儲(chǔ)信息 ? These circuits form a sequential circuit, because the output of the circuit is also used as input to the circuit 這些電路是時(shí)序電路，因?yàn)檫@種電路的輸出信號(hào)也被用作電路的輸入信號(hào) 4–36 Circuits as Memory 存儲(chǔ)器電路 ? An SR latch stores a single binary digit (1 or 0) SR鎖存器存儲(chǔ)一個(gè)二進(jìn)制位 ? There are several ways an SR latch circuit could be designed using various kinds of gates Figure An SR latch 4–37 Circuits as Memory 存儲(chǔ)器電路 ? The design of this circuit guarantees that the two outputs X and Y are always plements of each other ? The value of X at any point in time is considered to be the current state of the circuit ? Therefore, if X is 1, the circuit is storing a 1。 if X is 0, the circuit is storing a 0 Figure An SR latch 4–38 Integrated Circuits 集成電路 ? Integrated circuit (also called a chip) A piece of silicon on which multiple gates have been embedded 集成電路是嵌入了多個(gè)門(mén)的硅片 These silicon pieces are mounted on a plastic or ceramic package with pins along the edges that can be soldered onto circuit boards or inserted into appropriate sockets 這些硅片被封裝在塑料或者陶瓷中，邊緣有引腳，可以焊接在電路板上或者插入適合的插座中。 4–39 Integrated Circuits 集成電路 ? Integrated circuits (IC) are classified by the number of gates contained in them Page 107 4–40 Integrated Circuits 集成電路 Figure An SSI chip contains independent NAND gates 4–41 CPU Chips CPU芯片 ? The most important integrated circuit in any puter is the Central Processing Unit, or CPU 中央處理器 ? Each CPU chip has a large number of pins through which essentially all munication in a puter system occurs 每個(gè) CPU芯片都有大量的引腳，計(jì)算機(jī)系統(tǒng)的所有通信都是通過(guò)這些引腳完成的。
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