ch15.4.htm

介绍asci设计的一本书

<A NAME="marker=195410">
 </A>
Package cost</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=195413">
 </A>
$0.01/pin, &#8220;penny per pin&#8221;</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=195415">
 </A>
Varies widely, figure is for low-cost plastic package, approximately constant</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=195417">
 </A>
1</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=195420">
 </A>
<A NAME="marker=195419">
 </A>
Wafer cost</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=195422">
 </A>
$1 k to  $5 k</P>
<P CLASS="TableLeft">
<A NAME="pgfId=195423">
 </A>
average $2 k</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=195425">
 </A>
Varies widely, figure is for a mature, 2LM CMOS process, approximately constant</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=195427">
 </A>
1</P>
</TD>
</TR>
</TABLE>
<TABLE>
<TR>
<TD ROWSPAN="1" COLSPAN="4">
<P CLASS="TableTitle">
<A NAME="pgfId=172546">
 </A>
TABLE&nbsp;15.4&nbsp;<A NAME="39404">
 </A>
Area estimates for datapath functions.<A HREF="#pgfId=182077" CLASS="footnote">
2</A>
 </P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172554">
 </A>
<SPAN CLASS="TableHeads">
Datapath function</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172556">
 </A>
<SPAN CLASS="TableHeads">
Area per bit/</SPAN>
<SPAN CLASS="Symbol">
l</SPAN>
<SPAN CLASS="TableHeads">
2 </SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableFirst">
<A NAME="pgfId=172558">
 </A>
Area/ <SPAN CLASS="Symbol">
l</SPAN>
<SUP CLASS="Superscript">
2 </SUP>
(32-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableFirst">
<A NAME="pgfId=172560">
 </A>
Area/ <SPAN CLASS="Symbol">
l</SPAN>
<SUP CLASS="Superscript">
2 </SUP>
(64-bit)</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172562">
 </A>
High-speed comparator (4&#8211;32 bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172564">
 </A>
24,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172566">
 </A>
7.7E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172568">
 </A>
1.5E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172570">
 </A>
High-speed comparator (32&#8211;128 bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172572">
 </A>
28,800</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172574">
 </A>
9.2E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172576">
 </A>
1.8E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172578">
 </A>
Leading-one detector (<SPAN CLASS="EquationVariables">
n</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172580">
 </A>
7200 log<SUB CLASS="Subscript">
2</SUB>
<SPAN CLASS="EquationVariables">
n</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172582">
 </A>
1.2E + 06</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172584">
 </A>
2.8E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172586">
 </A>
All-ones detector (<SPAN CLASS="EquationVariables">
n</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172588">
 </A>
6000  +  800 log<SUB CLASS="Subscript">
2</SUB>
<SPAN CLASS="EquationVariables">
n</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172590">
 </A>
3.2E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172592">
 </A>
6.9E + 05</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172594">
 </A>
Priority encoder (<SPAN CLASS="EquationVariables">
n</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172596">
 </A>
19,000  +  1400 log<SUB CLASS="Subscript">
2</SUB>
 (<SPAN CLASS="EquationVariables">
n</SPAN>
 &#8211; 2)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172598">
 </A>
8.4E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172600">
 </A>
1.8E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172602">
 </A>
Zero detector (<SPAN CLASS="EquationVariables">
n</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172604">
 </A>
5500  +  800 log<SUB CLASS="Subscript">
2</SUB>
<SPAN CLASS="EquationVariables">
n</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172606">
 </A>
3.0E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172608">
 </A>
6.6E + 05</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172610">
 </A>
Barrel shifter/rotator (<SPAN CLASS="EquationVariables">
n- </SPAN>
by <SPAN CLASS="EquationVariables">
m</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172612">
 </A>
19,000 + 1000<SPAN CLASS="EquationVariables">
n</SPAN>
  +  1600 <SPAN CLASS="EquationVariables">
m</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172614">
 </A>
3.4E + 06</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172616">
 </A>
1.2E + 07</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172618">
 </A>
Carry-save adder</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172620">
 </A>
24,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172622">
 </A>
7.7E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172624">
 </A>
1.5E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172626">
 </A>
Digital delay line (<SPAN CLASS="EquationVariables">
n</SPAN>
 delay stages, <SPAN CLASS="EquationVariables">
t</SPAN>
 output taps)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172628">
 </A>
12,000  +  6000<SPAN CLASS="EquationVariables">
n</SPAN>
  +  8400 <SPAN CLASS="EquationVariables">
t</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172630">
 </A>
1.5E + 07</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172632">
 </A>
6.0E + 07</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172634">
 </A>
Synchronous FIFO (<SPAN CLASS="EquationVariables">
n</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172636">
 </A>
34,000  +  9600<SPAN CLASS="EquationVariables">
n</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172638">
 </A>
1.1E + 07</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172640">
 </A>
4.1E + 07</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172642">
 </A>
Multiplier-accumulator (<SPAN CLASS="EquationVariables">
n</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172644">
 </A>
190,000  +  18,000<SPAN CLASS="EquationVariables">
n</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172646">
 </A>
2.4E + 07</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172648">
 </A>
8.5E + 07</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172650">
 </A>
Unsigned multiplier (<SPAN CLASS="EquationVariables">
n- </SPAN>
by <SPAN CLASS="EquationVariables">
m</SPAN>
-bit)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172652">
 </A>
54,000  +  18,000 (<SPAN CLASS="EquationVariables">
n</SPAN>
 &#8211; 2)</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172654">
 </A>
1.9E + 07</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172656">
 </A>
7.4E + 07</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172658">
 </A>
2:1 MUX</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172660">
 </A>
7200</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172662">
 </A>
2.3E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172664">
 </A>
4.6E + 05</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172666">
 </A>
8:1 MUX</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172668">
 </A>
29,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172670">
 </A>
9.2E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172672">
 </A>
1.8E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172674">
 </A>
Low-speed adder</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172676">
 </A>
28,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172678">
 </A>
8.8E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172680">
 </A>
1.8E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172682">
 </A>
2901 ALU</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172684">
 </A>
41,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172686">
 </A>
1.3E + 06</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172688">
 </A>
2.6E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172690">
 </A>
Low-speed adder/subtracter</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172692">
 </A>
30,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172694">
 </A>
9.6E + 05</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172696">
 </A>
1.9E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172698">
 </A>
Sync. up&#8211;down counter with sync. load and clear</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=172700">
 </A>
43,000</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172702">
 </A>
1.4E + 06</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=172704">
 </A>
2.8E + 06</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">