By James E. Stine
ISBN-10: 1402077106
ISBN-13: 9781402077104
This article offers easy implementation techniques for mathematics datapath designs and methodologies used in the electronic approach. the writer implements a number of datapath designs for addition, subtraction, multiplication, and department. idea is gifted to demonstrate and clarify why convinced designs are selected. each one implementation is mentioned by way of layout offerings and the way specific idea is invoked within the undefined. besides the idea that emphasizes the layout in query, Verilog modules are awarded for figuring out the elemental principles that accompany each one layout. Structural versions are carried out to assure right synthesis and for incorporation into VLSI schematic-capture courses.
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Additional resources for Digital Computer Arithmetic Datapath Design Using Verilog HDL (International Series in Operations Researchand Management Science)
Example text
The use of a $random statement to implement random generation of inputs. This can be extremely useful in a test bench. The wire data type is the default data type as in the original standard. However, with the new standard the default data type can be changed or removed. However, in this text the following convention will be utilized. In this book, we will make the code easier to view by not showing wires. Some compilers will complain about this and produce an error. Therefore, for most code, it is always good to declare a wire when the bit size is greater than 1.
It also uses n/r − 2 sets of carry skip logic, each of which requires 2 gates. Thus, the total number of gates used by an n-bit CSKA is: 9·n+2· n −2 r The worst-case delay of an n-bit CSKA uses (4 · r + 5) for the first block before the carry out is ready. 16. 16-bit CSKA Verilog Code. for the carry to skip. The last block has a delay of 4 · r + 1 from the carry in to the most significant sum bit. 1 n n − 2) + 4 · r + 1 = 8 · r + 6 + 2 · r r Optimizing the Block Size to Reduce Delay The optimum block size is determined by taking the derivative of the delay with respect to r, setting it to zero, and solving for r.
In addition, the FA implementation already has the required logic to produce the generate and propagate. Therefore, the 9-gate FA is reduce to 8-gates consisting of two half-adders with additional outputs for both generate and propagate. In addition, the generate and propagate signals are both ready after 2 . Since the Verilog code is similar to the FA Verilog code, it is not shown. 9. Reduced Full Adder (RFA) Implementation. The logic used to produce the carries is typically referred to as a carry lookahead generator (CLG).
Digital Computer Arithmetic Datapath Design Using Verilog HDL (International Series in Operations Researchand Management Science) by James E. Stine
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