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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,P224,题,4-1,:,7,、,某,72,个引脚的内存条,其数据线引脚为,32,根,内存条上的动态存储器为,2M36,共,4,片,,故计算机内存总容量为,(),MB,,,且具有奇偶校验位。,A)32 B)16 C)64 D)8,分析:单片:,2M36=2M4(8+1),相当于,8MB,所以,4,片的容量是:,48MB=32MB,8,、,某,168,个引脚的内存条,其数据线引脚为,64,根,内存条上的动态存储器为,4M64,共,8,片,,故计算机内存总容量为,(),MB,,,不具有奇偶校验位。,A)128 B)256 C)64 D)32,分析:单片:,4M64=4M8 8,相当于,32MB,所以,8,片的容量是:,832MB=256MB,4-2,2734 (4)KB 2764 (8)KB 27128 (16)KB,27256 (32)KB 27512 (64)KB 27C040 (512)KB,4-7:,27128 A14,未参与译码,所以有两组重叠地址,00003FFFH,或,40007FFFH,2764 A13,、,A14,未参与译码,所以共有四组重叠地址,80009FFFH,A000BFFFH,C000DFFFH,E000FFFFH,4-8 2764:00001FFFH,6264:80009FFFH,4-9,用,138,替代门电路,画出连线图,仍然使用地址,SRAM6116,的地址范围为:,A0000HA07FFH,A,19,A,18,A,17,A,16,A,15,A,14,A,13,A,12,A,11,A,10,A,9,A,8,A,7,A,6,A,5,A,4,A,3,A,2,A,1,A,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,这种连接方法则,6116,的地址是:,90000907FFH,不符合题意,还有一组重叠地址:,9080090FFFH,错误,A16,A17,Y0,4-10,按图,4.31,做:,A19,经非门接,74LS30,则地址为:,2000,0,207FFH,因,A11,空闲,还有一组重叠区:,20800,20FFFH,按图,4.32,做:,YOY7,对应,CS0CS7,地址为:,CS0:4000047FFFH CS1:480004FFFFH,CS2:5000057FFFH CS3:580005FFFFH,CS4:6000067FFFH CS5:680006FFFFH,CS6:7000077FFFH CS7:780007FFFFH,4-11 62256,地址范围:,380003FFFFH,
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