Arithmetic-logic unit

Here is an example of a parameterized jV-bit arithmetic-logic-unit that performs an exclusive-or, less than, and an increment-by-1 operation. 

Here is a model of a different simple arithmetic-logic-unit. This logic unit performs four functions add, nand, greater-than and exclusive-or. A continuous assignment statement with a conditional expression is used to model the arithmetic-logic-unit. 

Resource allocation refers to the process of sharing an arithmetic-logic-unit (ALU) under mutually-exclusive conditions. Consider the following if statement. 

Chapter 3 describes how Verilog HDL constructs are collectively used to model hardware elements. While Chapter 2 describes the mapping of Verilog HDL to logic gates, this chapter describes the opposite scenario, which is, how to model a hardware element in Verilog HDL for synthesis. Elaborate examples are provided for many common hardware elements, such as multiplexers, counters, decoders and arithmetic-logic-units. 

Figure 1. Schematic diagram of the rocket-borne NfR spectrometer. Key A, amplifier S/H, sample and hold A/DC, analog-to-digital converter D/A, digital-to-analog converter and ALU, arithmetical logic unit. (Reproduced with permission from Ref. 3. Copyright 1981, American Institute of Physics.)...

ALU (arithmetic/logic unit) The part of the central processor of a computer in which simple arithmetic and logical operations are performed electronically. For example, the ALU can add, subtract, multiply, or compare two numbers, or negate a number. 

Design of a self-assembling, repairing and reconfiguring Arithmetic Logic Unit... 

In 1970, the first IMSL was released its subroutines were called from FORTRAN programs. American electrical engineer Seymour Cray used an approximation to division, rather than the actual floating point division, for the CDC 6600 to get a faster arithmetic logic unit (ALU). 

The heart of a eomputer is the CPfl, which in the case of a microcomputer is a microprocessor chip. A microprocessor is made up of a control unit and an control unit determines the sequence of operations by means of instructions frvmi a program stored in tho computer memory. The control unit receives informaiion from tho input device, fetches instructions and data from the memory, and transmits instructions lo the arithmetic logic unit, output. and memory. 

The arithmetic logic unit, or Al,l,i, of a CPU is made up of a series of registers, or accumulators, in which the intermediate results of binary arithmetic and logic operations are accumulated. The Intel Pentium 4 processor coniains nearly 50 million transistors and is capable of operating al clock speeds greater than 5.5 GHz. The Intel tianium processor contains 22 million transistors (the Itanium 2 processor has410 million transistors I. The fastest computers can execute nearly 1 billion instructions per second. 

SIMD. This Single instruction stream, multiple data stream or SIMD family employs many fine- to medium-grain arithmetic/logic units (more than tens of thousands), each associated with a given memory block (e.g., Maspar-2, TMC CM-5). Under the management of a single system-wide controller, all units perform the same operation on their independent data each cycle. 

Accumulator Usually a part of the arithmetic-logic unit (ALU) of a computer that is used for intermediate storage. 

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