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4.13 设有一个128K×16位的RAM芯片,试问该芯片共有多少个基本单元电路(简称存储基元)?欲设计一种具有上述同样多存储基元的芯片,要求对芯片字长的选择应满足地址线和数据线的总和为最小,试确定这种芯片的地址线和数据线,并说明有几种解答？
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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。
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.
画图说明异步通信中请求与回答有哪几种互锁关系
3.12·设数据总线上接有A，B、C、D 4个寄存器，要求选用合适的74系列凇片，完成下列逻辑设计：(1）设计一个电路，在同一时间实现D→A，D→B和D)→C寄存器间的传送。(2)设计一个电路，实现下列操作。T0时刻完成D→总线T1时刻完成总线→AT2时刻完成A→总线T3时刻完成总线→B
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