Pdf an approximate multiplyaccumulate unit with low power. Our proposed work is on the low power mac unit that is used. In present day mac unit is demanded in most of the digital signal processing. Pdf fpga implementation of low power and high speed 64bit. The propagation delay of the this section describes fourbit reversible multiply accumulate design is 5. Processing dsp is one of the capable processing units, but it is not commonly. The multiply accumulate unit mac is the main computational kernel in dsp. Architecture and implementation of a vectorsimd multiplyaccumulate unit abstract. Ne tahar, senior member, ieee department of electrical and computer engineering, concordia university, montreal, qc h3g 1m8, canada corresponding author.
Low complexity multiplyaccumulate units for convolutional. Design and performance analysis of multiplyaccumulate. Design of multiply and accumulate unit using vedic multiplication techniques v. Multiply accumulate mac unit easily explained forum. This paper proposed the design of square and multiply and accumulatemac unit. Keywords reversible mac unit is discussed in section 4. This gives us method for hierarchical multiplier design. Introduction multiply accumulate mac unit is extensively used in microprocessors and digital signal processors for dataintensive applications, such as filtering, convolution, fft transform and inner products.
The multiplier 20 takes several processing cycles to determine the product ac. The vector mac can perform one 64spl times64, two 32spl times32, four 16spl times16, or eight 8spl times8 bit signedunsigned multiply using essentially the same hardware as a scalar 64bit mac and with only a small increase in delay. The mac unit is a unit that is mostly demanded in dsp applications. Pdf in the emerging technologies the low power designs play a critical role of operations. This research work presents the efficiency of urdhva triyagbhyam vedic method for multiplication which strikes. The multiplyaccumulate mac unit is a specialized coprocessor added to the c166s. It is one of the significant multiply and accumulate unit using baugh parameters persuading the functional power wooley based multiplier. Architecture and implementation of a vectorsimd multiplyaccumulate unit.
A high performance multiplyaccumulate unit with double. Mac unit performs both multiply and addition functions. The rca is built from n full adders cascaded together, with the carryout bit of one fa tied to the carryin bit of the next fa. Developing high speed and low power mac is crucial to use dsp in the future wsn. Speed of multiplier is important in mac unit which determines critical path as well as. Many researchers can be applied on binary trees constructed using 4. The inputs for the multiply accumulate mac unit are fetched from memory location and fed to multiplier block of the mac, which will perform multiplication and give the result to adder. C ranjit kumar g rahul ram n chandu reddy pigilisuresh. Pdf reversible implementation of novel multiply accumulate. Architecture and implementation of a vectorsimd multiply.
High throughput multiplier accumulator mac is always a key element to achieve a highperformance digital signal processing. Double throughput multiplyaccumulate unit for flexcore. Signal processing with the maxq multiplyaccumulate unit. Here, a black circle represents a pp and each pp row is. In the present world of irreversible circuits, the multiply accumulate unit multiplies the two operands, adds the product to the previously accumulated result and stores back the new result in the. The c55x cpu provides two multiply accumulate mac units each capable of 17bit x 17bit multiplication in a single cycle. Modified multiply and accumulate unit with hybrid encoded. Pdf double throughput multiplyaccumulate unit for flexcore. The proposed structure provides highest performance among the structures that have been compared. Is the mac unit synonymous to the arithmetic logic unit.
In this work, a carrysave operation based mac unit is. Dsp processors share basic features designed to support highperformance, repetitive, numerically intensive tasks. Design of 16bit floating point multiply and accumulate unit. At the add state, the controller commands the addaccumulator unit to add and accumulate result of multiplication. Vlsi design and implementation of low power mac unit with block enabling technique free download. The multiply accumulate mac unit is a specialized coprocessor added to the c166s cpu core to improve the performance of signal processing algorithms. The multiply accumulate mac unit is a specialized coprocessor added to the c166s. Us20080243976a1 multiply and multiply and accumulate unit. Double throughput multiplyaccumulate unit for flexcore processor enhancements tung thanh hoang, magnus sj. To design a column addition pipeline architecture by using the concept of half adder, full adder and 4. The developed low power mac unit is verified for image processing systems exploiting insignificant bits in pixels values and the similarity of.
Multiply accumulate mac unit consists of multiplier, adder and an accumulator. Digital signal processing is the application of mathematical operations to digitally represented signals. The proposed design has multiplier and accumulator units, multiplier block perform normal multiplication operation. The architecture and vlsi implementation of an arbitrarymoduli rns mac are given. Coldfire architecture cores print nxp semiconductors. Us20080243976a1 multiply and multiply and accumulate. Fpga implementation of low power and high speed 64bit. In one embodiment the multiply apparatus comprising a csa csa unit with nx rows each comprising na and gates for calculating a single bit product of two single bit input values and adder cells for adding results of a preceding. Speed of multiplier is important in mac unit which determines critical path as well as area is also of great importance in designing of mac unit. Nov 07, 2020 8 8 8 8 16bit multiply add unit and each bit is concatenated with one pp row. Design of multiply and accumulate unit using vedic. Whilst the multiplier 20 and its subsequent carrysaveadder 26 operate, an aligned value b of the addend b is generated by an alignmentshifter 34.
Introduction fx correlators enjoy an advantage over xf correlators because they need fewer computations. I should have suggested multiply accumulate operation among the alternative noun forms. Convention multiply and accumulate unit, proceedings of the ieee region 5 technical conference, 2007. For a mere multiply apparatus the cpa unit may consist only of na. Function of addition and multiplication is performed by the mac unit. The alignedaddend b may only partially overlap with the product. Us8683183b2 performing a multiplymultiplyaccumulate. Multiply accumulate mac unit for energyefficiency mahmoud masadeh, student member, ieee, osman hasan, senior member, ieee, and sofi. Multiply accumulate unit and method of operation us8620980b1 en 20050927. Multiply accumulate unit for the machine learning accelerator using feed forwardcutset free pipelined technique. In this work, a fast and low power mac unit is proposed. This article conference proceedings is brought to you for free and open access by scholars mine. Pdf implementation of mac unit using booth multiplier. High speed and areaefficient multiply accumulate mac unit for digital signal prossing applications.
The 8bit mac unit architecture is based on taking advantage of the free input lines of the available. A central 40bit arithmeticlogic unit alu is supported by an additional 16bit alu. The hardware unit that performs the operation is known as a multiplieraccumulator mac, or mac unit. Pdf design of efficient reversible multiply accumulate. For high speed mac unit, faster adder and multiplier circuits are required.
Firstly it computes the product of given numbers and forward the result for the second stage operation i. These include the multiply accumulate mac module, which provides highspeed, complex arithmetic processing for simple signal processing applications the enhacement multiply accumulate emac module, based on the original mac, but is optimized for 32 x 32 bit operations. The added mac instructions to the coldfire isa provide for the multiplication of two numbers, followed by the addition or subtraction of this number to or from the value contained in the. Multiply accumulate mac units are extensively used in mathematical operations such as matrix multiplication. Pdf design and analysis of high speed, area optimized. The multiply or mac unit includes a carry propagate adder cpa unit consisting of a row of na full adder cells for adding the carry vector and the sum vector provided by the output row of the csa unit. Conventionally a mac unit is made up of a chain of a multiplier and an accumulate adder, with a pipeline register in between, and an accumulate register for data feedback. The ability to compute with a fast mac unit is essential to achieve high performance in many dsp algorithms, and is why. This unit can calculate the running sum of products, which is at the heart of algorithms such as the fir 5 and fft 3. Performance of multiplier is enhanced by vhdl implementation of floating point multiplier using ancient vedic mathematics. The 8bit mac unit architecture is based on taking advantage of the free input. The multiplyaccumulate unit mac is the fundamental unit in digital signal processing dsp. For both, the multiply and the mac unit the carry input of the cpa unit is coupled to receive a first configuration signal to switch between processing of signed and unsigned twos complement operands.
Microelectronics europe gmbh warrants that the product will be free from defects in. And increasing the speed is achieved by reducing the critical path by changing the mac structure. In computing, especially digital signal processing, the multiply accumulate operation is a common step that computes the product of two numbers and adds that product to an accumulator. A cross multiply accumulate unit for fx correlators john bunton csiro, telecommunications and industrial physics, australia 25 august, 2001 1. Multiply stage produces an intermediate product of a. This will save the cost of the additional accumulator by merging the accumulation operation with the multiplication circuit. Pdf high speed and areaefficient multiply accumulate mac. The mac unit supports the coldfire integer multiply instructions muls and mulu and provides additional functionality for multiply accumulate operations.
Design of efficient reversible multiply accumulate mac unit. Us7107305b2 multiplyaccumulate mac unit for single. Us200300699a1 multiplyaccumulate mac unit for single. Redundant number systems provide carrypropagation free arithmetic, so that faster. The vector mac can perform one 64spl times64, two 32spl times32, four 16spl times16, or eight 8spl times8 bit signedunsigned. Inputconscious approximate multiplyaccumulate mac unit. Design and performance analysis of multiplyaccumulate mac unit. Mac unit is compared to conventional redundant carrysave and various standard mac architectures.
Praveena guideassistant professor abstract this paper proposed the design of multiply and accumulate mac unit using the techniques of ancient indian vedic mathematics that have been modified to improve performance. Feedforwardcutset free pipelined multiply accumulate unit for the machine learning accelerator sungju ryu, student member, ieee, naebeom park, and jaejoon kim, member, ieee abstract multiply accumulate mac computations account for a large part of machine learning accelerator operations. Mac unit is presented based on vedic method of multiplication 9. This paper describes the implementation of a 32x32bit multiply accumulate mac unit designed using ancient vedic mathematical techniques. The mac unit determines the power and the speed of the overall system. The architecture is needed to design a lowpower mac unit.
Reversible 8bit pipo shift register the dlatch can be realized using fredkin gate as shown in figure 20. Thus, the output of the multiplier is stored in registers in each cycle. In one embodiment, the present invention includes a processor having multiple execution units, at least one of which includes a circuit having a multiply accumulate mac unit including multiple multipliers and adders, and to execute a userlevel multiply multiply accumulate instruction to populate a destination storage with a plurality of elements each corresponding to an absolute value for a. Generally mac unit consists of three u floatingpoint multiplier, adder and an accumulator. Student, department of electronics engineering, priyadarshini college of engineering, nagpur head of department of electronics. Design of square and multiply and accumulatemac unit by. In proposed 64bit multiply and accumulate unit architecture, saving the area is achieved by fully utilizing the compressors instead of putting zeros in free inputs by using 5. Redundant number systems provide carrypropagation free arithmetic, so that faster arithmetic circuits can be designed. Design and implementation of multiply accumulate unit for. Mac unit is a fundamental block in the computing devices, especially digital signal. Feed forwardcutsetfree pipelined multiplyaccumulate unit. Pdf high speed and areaefficient multiply accumulate.
Low power multiply accumulate unit mac for dsp applications. Therefore, it high speed multiply accumulate units 7, 8. The cost and performance are analyzed with respect to other designs, and the analysis indicates that the design is generally quite competitive. Address data flow unit that provides data address generation and includes a 16bit arithmetic unit capable of performing arithmetic, logical, shift, and saturation operations data computation unit containing the primary computation units of the cpu including a 40bit arithmetic logic unit, two multiply accumulate units macs, and a shifter. Swift and approximate multiply and accumulate unit for embedded dsp applications.
Reversible 4bit multiply accumulate unit 6 international journal of computer applications 0975 8887 volume 85 no 16, january 2014 the fourbit inputs x and y are applied to the multiplier unit addersubtractor units and one half addersubtractor unit in which results in eightbit product. Pdf a high speed and areaefficient merged multiply accumulate mac units is. Implementation of static and semistatic versions of a 24. Performing the same operation in the maxq architecture shrinks code space from 12 words to 9 words, and execution time is reduced.
Pdf a novel low power multiplyaccumulate mac unit design. Firstly, multiplier computes the given number output and the result is forwarded to second stage i. Pdf design and analysis of high speed, area optimized 32x32. However, the amount of storage needed is the same for both. Us200300699a1 us09972,720 us97272001a us20030699a1 us 200300699 a1 us200300699 a1 us 200300699a1 us 97272001 a us97272001 a us 97272001a us 20030699 a1 us20030699 a1 us 20030699a1 authority us united states prior art keywords vectors accumulate multiply vector bits prior art date 20011005 legal status the legal status is an. Design and implement 64 bit macmultiplier and accumulator.
Pdf fpga implementation of low power and high speed 64. Pdf low power multiply accumulate unit mac for dsp. Pdf an approximate multiplyaccumulate unit with low. In this work, an alternative redundant arithmetic based fused multiply accumulate mac unit is designed especially suitable for 6input lookuptable lut based fpgas. The multiply accumulate unit mac is the main computational kernel in dsp architectures. Figure 2 illustrates the basic architecture of its implementation 14, which is fairly typical and used in some recent. Conference proceedings is brought to you for free and open. The developed low power mac unit is verified for image processing systems exploiting insignificant bits in.
Design of square and multiply and accumulatemac unit by using vedic multiplication techniques. Multiply accumulate mac units are extensively used in. A new architecture for multipleprecision floatingpoint. In recent years, multiply accumulate mac unit is developing for various high performance applications. A high performance multiplyaccumulate unit with double carry. To realize the areaefficient and high speed mac unit proposed in this work. The maxq multiplier is a true multiply accumulate unit. Multiply accumulate unit and method of operation us20060277245a1 en 20050407. The proposed multiplication can be designed by using wallace tree algorithm. The article of claim 6, wherein the first multiply accumulate operation comprises a single instructionmultiple data simd operation. Pdf design of efficient reversible multiply accumulate mac.
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