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4.15设CPU共有16根地址线,8根数据线,并用MREQ(低电平有效)作访存控制信号,R/W作读/写命令信号(高电平为读,低电平为写)。现有这些存储芯片:ROM(2K×8位,4K×4位,8K×8位),RAM(1K×4位,2 K×8位,4K×8位)及74138译码器和其他门电路(门电路自定)。试从上述规格中选用合适的芯片,画出CPU和存储芯片的连接图。要求如下﹔(1）最小4K地址为系统程序区.4096~16383地址范围为用户程序区。(2〉指出选用的存储芯片类型及数量。(3）详细画出片选逻辑。

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语法填空Complete the following sentences, using the right verb forms.1) They __ (live) in the suburb when she was only a child.2) The football match (begin) at seven yesterday evening.3) The time of the entrance examination _ (be changed) to next week.4) The students (play) basketball energetically on the playground right now.5) The professor (explain) the questions to the students already.6) I (try) to repair the car while you were watching TV.7) They went to have their dinner after they (finish) the assignment.8) The bridge _ (be built) by the time you come back from abroad.9) She (tell) me that she would be very happy to have us in her home at the weekend.10) The children have already learnt from chemistry that water (be made) up of hydrogen and oxygen.

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