组成习题答案ppt课件.ppt
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ComputerOrganization,exercise,2-1Givethesignmag、1scompl、2scomplrepresentationofthefollownumber(wordlengthis8),whereMSBisthehighestbit(signbit),LSBisthelowestbit。
Ifthenumberisdecimal,thedecimalpointisbehindtheMSB;ifthenumberisinteger,thenthedecimalpointisbehindtheLSB.
(1)35/64
(2)23/128(3)127(4)1(decimalrepresentation)(5)1(integerrepresentation),2-1Solute:
(1)-35/64binary-100011/1000000=-0.100011=-0.1000110signmag:
1.10001101scompl:
1.01110012scompl:
1.0111010
(2)23/128binary10111/10000000=0.0010111signmag:
0.00101111scompl:
0.00101112scompl:
0.0010111,2-1Solute:
(3)-127binarysignmag:
11111111(1,1111111)1scompl:
10000000(1,0000000)2scompl:
10000001(1,0000001)(4)-1(decimal)Therearenorepresentationof-1insignmagand1scompl2scompl:
1.0000000(5)-1(integer)signmag:
10000001(1,0000001)1scompl:
11111110(1,1111110)2scompl:
11111111(1,1111111),2-2Rankthesenumbers:
(smalltolarge)16,1010.11B,25.3Q,X12scompl=10001101,1CH,X21scompl=01001101,0110.1001BCD,X3signmag=10101011,-X42scompl=10111111,-X52scompl=10100101Key:
(1)unifyalltheforms,generallydecimalisselected
(2)transformationbetweenB,Q,HandBCD;,2-2Solute:
16,1010.11B,25.3Q,X12scompl=10001101,0110.1001BCD,1CH,X21scompl=01001101,X3signmag=10101011,-X42scompl=10111111,-X52scompl=10100101AN:
1010.11B=10.75,25.3Q=21.375,X1=-01110011B=-1150110.1001BCD=6.9,1CH=28,X2=01001101B=77X3=-0101011B=-43,X4=01000001B=65,X5=01011011B=91smalltolarge:
X1,X3,0110.1001BCD,1010.11B,16,25.3Q,1CH,X4,X2,X5,3-1设计一个A、B、C三人表决电路,当表决某个提案时,多数人同意提案通过,同时A具有否决权,用与非门实现。
设计步骤列出真值表设A、B、C三个人,表决同意用1表示,不同意时用0表示;Y为表决结果,提案通过用1表示,提案未通过用0表示,同时还要考虑A的否决权。
写出逻辑表达式画出逻辑图,3-1Solute:
写出逻辑表达式:
Y=AB+AC,3-1Solute:
A,C,Y,B,6-1Givena32bitfloating-pointnumber,1bitforsign,8bitforE,representedbybiasedcode,23bitforM,representedby2sComplement;radixis2:
(1)Maximalbinary;
(2)Minimalbinary;(3)range;(4)positiveandnegativenormalizedrepresentationfloat-pointthatclosestto0,6-1Solute:
规格化浮点数的最大正数值是由尾数的最大正数值与阶码的最大正数值组合而成的;最小正数值是由尾数的最小正数值与阶码的最小负数值组合而成的。
在负数区间;最大负数值是由尾数的最大负数值与阶码的最小负数值组合而成的;最小负数值是由尾数的最小负数值与阶码的最大正数值组合而成的。
6-1Solute:
f-pformatisX=2EM,8bitE(biasedcode),witharangeof-128+127;23bitM(2sC),withitmaxpositivevalueofMmax=1-2-23,minpositiveisMmin=2-23,maxnegativevalueofMmax=-2-23,minpositivevalueofMmin=-1
(1)binaryformatofMaximum:
PositiveXmax=2127(1-2-23)=21270.111111=11111100000(23bits1,104bits0)NegativeXmax=2-128(-2-23)=-0.0000001(151bits0)
(2)binaryformatofMinimum:
positiveXmin=2-1282-23=0.0000001(151bits0)NegativeXmin=2127(-1)=-10000000(127bits0),6-2TransformthefollowdecimaltoIEEE75432bitfloat-point
(1)27/64
(2)-27/64,6-2Solute:
TransformthefollowdecimaltoIEEE75432bitfloat-point
(1)27/64=11011X2-6=1.1011X2-2S=0;E=2127125=01111101B;M=10110000000000000000000result:
001111101101100000000000000000003ED80000H,6-2Solute:
TransformthefollowdecimaltoIEEE75432bitfloat-point
(2)-27/64=-11011X2-6=-1.1011X2-2S=1;E=2127125=01111101B;M=10110000000000000000000result:
10111110110110000000000000000000BED80000H,6-3Transformdecimal-0.75toIEEE75432bitsingleprecisionfloat-pointnumber,6-3Solute:
Transformdecimal-0.75toIEEE75432bitsingleprecisionfloat-pointnumber-0.75=-3/4=-11X2-2=-1.1X2-1S=1;E=1127126=01111110B;M=10000000000000000000000result:
10111111010000000000000000000000BF400000H,6-4Transform0C0B00000HIEEE75432bitfloat-pointnumbertoDecimal,6-4Solute:
Transform0C0B00000HIEEE75432bitfloat-pointnumbertoDecimal0C0B00000H=11000000101000000000000000000000S=1;e=E-127=(1000000101111111)B
(2)10;1.M=(1.01)B=(1.25)10result:
(-1)1X(1.25)X22=-1X1.25X4=-5.0,6-5Transform(0.15)10toNormalizedfloating-pointnumbersrepresentation阶码:
Signofm:
1-bitExponent:
8-bit,integer,biasedcode,radix=2mantissa:
23-bit,decimal,sign-mag,radix=2,impliedleading1,Signofmantissa,exponent,mantissa,6-5Transform(0.15)10toNormalizedfloating-pointnumbersrepresentation阶码:
Signofm:
1-bitExponent:
8-bit,integer,biasedcode,radix=2mantissa:
23-bit,decimal,sign-mag,radix=2,impliedleading1Solute:
0.15D0.0010011001100110010.100110011001100122S=0;M00110011001100110011001=199999HE=-2+128=126D01111110=7EHN001111110001100110011001100110013F199999H,Signofmantissa,exponent,mantissa,6-6Transform(0.1)10toNormalizedfloating-pointnumbersrepresentation阶码:
(1)Signofm:
1-bitExponent:
8-bit,integer,biasedcode,radix=2mantissa:
23-bit,decimal,sign-mag,radix=2,impliedleading1
(2)Signofm:
1-bitExponent:
7-bit,integer,biasedcode,radix=2mantissa:
6-bit,decimal,sign-mag,radix=16,Signofmantissa,exponent,mantissa,6-6Transform(0.1)10toNormalizedfloating-pointnumbersrepresentation阶码:
(1)Signofm:
1-bitExponent:
8-bit,integer,biasedcode,radix=2mantissa:
23-bit,decimal,sign-mag,radix=2,impliedleading1Solute:
0.1D0.000110011001100110010.1100110011001100123S=0;M100110011001100110011004CCCCCH;E-3+128=