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This avoids a major problem with ripple adders caused by the fact that the carry signal must propagate along the entire length of the chain of internal adders, causing longer delays in the electrical signals and thus reducing the clock rates of a circuit or possibly increasing power consumption A carry select adder gets around this through a common hardware trick of speculative execution It divides the inputs into blocks and adds each block twice, once assuming the carry is low and once assuming it is high The result is then selected after the circuit, when the carry for the block has been computed Listing 12-16 shows the specification of the essence of the hardware layout of a carry select adder using the techniques we ve developed so far The specification uses the slicing syntax for arrays described in 4 Listing 12-16.

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DMP files are designed to be forward-compatible, meaning that newer releases can read older releases DMP files and process them successfully. I have heard of people exporting a version 5 database and successfully importing it into Oracle 10g (just as a test!). So Import can read older version DMP files and process the data therein. The converse, however, is most definitely not true: the Import process that comes with Oracle9i Release 1 can t will not successfully read a DMP file created by Oracle9i Release 2 or Oracle 10g Release 1. For example, I exported a simple table from Oracle 11g Release 2. Upon trying to use these DMP files in Oracle 10g Release 2, I soon discovered Oracle 10g Release 2 Import will not even attempt to process the Oracle 11g Release 2 DMP file: $ imp userid=/ full=y Import: Release 10.2.0.4.0 - Production on Wed Jan 20 18:21:03 2010 Copyright (c) 1982, 2007, Oracle. All rights reserved.

Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options IMP-00010: not a valid export file, header failed verification IMP-00000: Import terminated unsuccessfully Even in the cases where IMP was able to recognize the file, there would be a great chance that the DDL generated by the 11g Release 2 EXP tool would not be DDL that the earlier version of Oracle would recognize. For example, suppose you export from any release of Oracle version 9i Release 2 or above. You would find in the export file that every CREATE TABLE has a COMPRESS or NOCOMPRESS option added to it. Oracle 9i Release 2 added basic table compression as a feature. If you were able to get any release of

A Carry Select Adder Modeled Using Propositional Logic let mux a b c = ((~~~a ==> b) &&& (a ==> c)) let carrySelectAdder totalSize maxBlockSize (x:bitvec) (y:bitvec) (sumLo:bitvec) (sumHi:bitvec) (carryLo:bitvec) (carryHi:bitvec) (sum:bitvec) (carry:bitvec) = Blocks [ for i in 0.maxBlockSize.totalSize-1 -> let sz = min (totalSize-i) maxBlockSize let j = i+sz-1 let carryLo = Arrayappend [| False |] carryLo[i+1.j+1] let adderLo = rippleAdder sz x[i.j] y[i.j] sumLo[i.j] carryLo let carryHi = Arrayappend [| True |] carryHi[i+1.j+1] let adderHi = rippleAdder sz x[i.j] y[i.j] sumHi[i.j] carryHi let carrySelect = (carry[j+1] === mux carry[i] carryLo[sz] carryHi[sz]) let sumSelect = Blocks [for k in i.j -> sum[k] === mux carry[i] sumLo[k] sumHi[k]] adderLo &&& adderHi &&& carrySelect &&& sumSelect ].