By James E. Stine (auth.)
The function of mathematics in datapath layout in VLSI layout has been expanding in value over the past numerous years as a result of call for for processors which are smaller, quicker, and burn up much less strength. regrettably, which means lots of those datapaths can be complicated either algorithmically and circuit clever. because the complexity of the chips raises, much less significance might be put on knowing how a specific mathematics datapath layout is applied and extra value could be given to while a product can be put on the marketplace. it is because many instruments which are on hand this present day, are computerized to aid the electronic method dressmaker maximize their successfully. regrettably, this can result in difficulties while enforcing specific datapaths. The layout of high-performance architectures is turning into extra compli cated as the point of integration that's able for plenty of of those chips is within the billions. Many engineers depend seriously on software program instruments to optimize their paintings, for that reason, as designs have become extra advanced much less figuring out goes right into a specific implementation since it could be generated automati cally. even supposing software program instruments are a hugely helpful asset to clothier, the price of those instruments doesn't slash the significance of realizing datapath ele ments. hence, a electronic process dressmaker could be conscious of how algorithms may be carried out for datapath parts. regrettably, as a result advanced ity of a few of those algorithms, it truly is occasionally obscure how a selected set of rules is applied with no seeing the particular code.
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Additional resources for Digital Computer Arithmetic Datapath Design Using Verilog HDL: CD-ROM Included
9 . 2 = 252 gates for full adders, 12 ·4 = 48 gates for the multiplexors, and 2 x 3 = 6 gates for the carry logic. The total gate count is 252 + 48 + 6 = 306 gates. An n-bit CSEA with r bit blocks uses 2 . n - r FAs, each of which requires 9 gates. 20. 2-1 Multiplexor Verilog Code. 21. 1-bit Multiplexor Verilog Code. 2 gates for the group propagate and generate logic. The multiplexor logic requires 4 . (n - r) gates. Thus, the total number of gates used by an n-bit CSEA is: 9· (2· n - r) + 2· (r;l - 1) + 4· (n - r) = 22· n - 13· r + 2· r;l - 2 Similarly, the worst-case delay can be computed as before.
Event-based timing control allows conditional execution based on the another event. Verilog waits on a predefined signal or a user defined variable to change before it executes a specific block. A sensitivity list is crucial to the design of sequential logic. It places the focus for the language on a particular construct to determine if it changes either by delay, event, or level. However, most of the time the sensitivity list is used conjunctively with an event-based change such as a clock transition.
Although there are implementations that can theoretically be reduced to the generation of the shifted multiples of the multiplicand and multi-operand addition (Le. the addition of more than two operands), most multipliers utilize the steps J. Stine, Digital Computer Arithmetic Datapath Design Using HDL © Springer Science+Business Media New York 2004 56 DIGITAL COMPUTER ARITHMETIC DATAPATH DESIGN below. Although there are various different perspectives on the implementation of multiplication, its basic entity usually is the adder.
Digital Computer Arithmetic Datapath Design Using Verilog HDL: CD-ROM Included by James E. Stine (auth.)