《计算机系统结构》第四章作业解答.htm

清华大学出版得计算机系统结构得答案

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style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">中断处理示意图：</SPAN><SPAN 
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<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312"><o:p>&nbsp;</o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">4.8 
</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">解：</SPAN><SPAN 
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<P class=MsoNormal 
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style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'Times New Roman'"><SPAN 
style="mso-list: Ignore">(1)<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
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style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">fByte 
= (1/10 + 1/75 + 1/15 + 1/50) MB/S = 0.2 MB/S<o:p></o:p></SPAN></P>
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= 1/fByte = 5us/Byte<o:p></o:p></SPAN></P>
<P class=MsoNormal 
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style="mso-list: Ignore">(2)<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
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style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">图示如下：</SPAN><SPAN 
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style="mso-ignore: vglayout" clear=all><SPAN lang=EN-US 
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<P class=MsoNormal 
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lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'Times New Roman'"><SPAN 
style="mso-list: Ignore">(3)<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
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style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">DEV1</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">第一次完成服务请求的时刻为</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">5us</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">；</SPAN><SPAN 
lang=EN-US 
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<P class=MsoNormal style="MARGIN-LEFT: 17.25pt"><SPAN lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">DEV2</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">第一次完成服务请求的时刻大于</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">145us</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">；</SPAN><SPAN 
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<P class=MsoNormal style="MARGIN-LEFT: 17.25pt"><SPAN lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">DEV3</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">第一次完成服务请求的时刻为</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">20us</SPAN><SPAN 
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<P class=MsoNormal style="MARGIN-LEFT: 17.25pt"><SPAN lang=EN-US 
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style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">第一次完成服务请求的时刻为</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312">40us</SPAN><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">；</SPAN><SPAN 
lang=EN-US 
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<P class=MsoNormal 
style="MARGIN-LEFT: 17.25pt; TEXT-INDENT: -17.25pt; mso-list: l1 level1 lfo3; tab-stops: list 17.25pt"><![if !supportLists]><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'Times New Roman'"><SPAN 
style="mso-list: Ignore">(4)<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
</SPAN></SPAN></SPAN><![endif]><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">不能。</SPAN><SPAN 
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<P class=MsoNormal 
style="MARGIN-LEFT: 17.25pt; TEXT-INDENT: -17.25pt; mso-list: l1 level1 lfo3; tab-stops: list 17.25pt"><![if !supportLists]><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 'Times New Roman'"><SPAN 
style="mso-list: Ignore">(5)<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
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style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">有三种方法：</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312"><o:p></o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN-LEFT: 35.25pt; TEXT-INDENT: -18pt; mso-list: l2 level1 lfo4; tab-stops: list 35.25pt"><![if !supportLists]><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-family: 楷体_GB2312"><SPAN 
style="mso-list: Ignore">①<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
</SPAN></SPAN></SPAN><![endif]><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">增加通道的最大流量；</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312"><o:p></o:p></SPAN></P>
<P class=MsoNormal 
style="MARGIN-LEFT: 35.25pt; TEXT-INDENT: -18pt; mso-list: l2 level1 lfo4; tab-stops: list 35.25pt"><![if !supportLists]><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-family: 楷体_GB2312"><SPAN 
style="mso-list: Ignore">②<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
</SPAN></SPAN></SPAN><![endif]><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">动态改变设备的优先级；</SPAN><SPAN 
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<P class=MsoNormal 
style="MARGIN-LEFT: 35.25pt; TEXT-INDENT: -18pt; mso-list: l2 level1 lfo4; tab-stops: list 35.25pt"><![if !supportLists]><SPAN 
lang=EN-US 
style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 楷体_GB2312; mso-bidi-font-family: 楷体_GB2312"><SPAN 
style="mso-list: Ignore">③<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
</SPAN></SPAN></SPAN><![endif]><SPAN 
style="FONT-SIZE: 15pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">增加一定数量的数据缓冲器。</SPAN><SPAN 
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