vhdl code for 4 bit digit serial multiplier
#1

Hi am koteswararao i would like to get details on vhdl code for 4 bit digit serial multiplier ..My friend hari kiran said vhdl code for 4 bit digit serial multiplier will be available here and now i am living at vijayavada and i last studied in the kl university and now am doing project i need help onverylog code for 4 bit serial multiplaier
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#2

The sample VHDL code contained below is for tutorial purposes. An expert may be bothered by some of the wording of the examples because this WEB page is intended for people just starting to learn the VHDL language. There is no intention of teaching logic design, synthesis or designing integrated circuits. It is hoped that people who become knowledgeable of VHDL will be able to develop better models and more rapidly meet whatever their objectives might be using VHDL simulations.

A few VHDL compilers have bugs. 'alias' may have to be eliminated.

Example of VHDL writing to standard output

The VHDL source code is hello_world.vhdl
This demonstrates the use of formatting text output to a screen.
A process is used to contain the sequential code that builds an
output line, then writes the line to standard output, the display screen.

Almost identical VHDL code hello_proc.vhdl
uses a procedure in place of the process to contain the sequential code.
note that the procedure has no arguments and the call needs no label.
Simply the statement my_proc; in the architecture is the call.

Example of VHDL reading and writing disk files

The VHDL source code is file_io.vhdl

This example is a skeleton for a VHDL simulation that needs input
from a file, simulates based on the input and produces output to
a file. The output file may be used as input to other applications.
The importance of being able to write to the display screen and to
read and write files is to maintain portability of your VHDL code.
Especially test benches, must be independent of any specific VHDL
systems Graphic User Interface, GUI. GUI differ radically and it
may be important to you to be able to develop and debug your
VHDL code independent of the host machine and independent of
the VHDL system supplier.

Simple parallel 8-bit sqrt using one component

The VHDL source code is sqrt8.vhdl
The output of the VHDL simulation is sqrt8.out
The schematic is sqrt8.jpg
The Sm component schematic is sqrtsm.jpg

This example shows how a Sm component is directly coded in VHDL as
concurrent statements. The multiplexor is coded as a single "when"
statement. "Sm" is mnemonic for subtractor-multiplexor.

The overall circuit that inputs an 8-bit integer and outputs a 4-bit
integer square root uses many copies of the Sm component. This circuit
uses the "entity" method of instantiating copies of a component. The
"port map" is the mapping of actual parameters onto the formal
parameters in the Sm entity.

The theory of operation is described in sqrt.txt
and wikipedia

Optimized parallel 8-bit sqrt using many components

The VHDL source code is sqrt8m.vhdl
The output of the VHDL simulation is sqrt8m.out
The schematic is sqrt8m.jpg

This circuit performs the same function on the input as does
sqrt8.vhdl above. The difference is that many specialized
entities were created as building block components. The specialization
eliminates circuitry that is not needed because the inputs are
logical 0 or 1. This was a step in developing the parallel 32-bit
square root circuit shown next.

The Sm component family are subsets of the schematic sqrtsm.jpg
sqrtsn.jpg
sqrts0.jpg
sqrts1.jpg
sqrtsb.jpg
sqrts0b.jpg
sqrts1b.jpg


32-bit parallel integer square root

The VHDL source code is sqrt32.vhdl
The output of the VHDL simulation is sqrt32.out
The schematic was never drawn. sqrt8m.vhdl was expanded
using "generate" statements to create sqrt32.vhdl

A group of VHDL components using generic parameters

Common building blocks for simulating digital logic are adders, registers,
multiplexors and counters. This example shows a set of generic entities
and the corresponding architectures that have the word length and delay
time as generic parameters. In addition to being useful in circuits,
the generic word length allows much smaller circuits to be debugged and
then the word length increased to the final desired value. The test
bench uses a word length of 8 while the example circuit that performs
a sequential multiplication uses a 16 bit word length.

Similar to the entity declaration "port" and the entity instantiation
"port map", with generics there is an entity declaration "generic" and
the entity instantiation "generic map."

The VHDL source code for the generic adder is add_g.vhdl
The VHDL source code for the generic register is reg_g.vhdl
The VHDL source code for the generic multiplexor is mux_g.vhdl
The VHDL source code for the generic counter is cntr_g.vhdl
The VHDL source code for the generic test bench is test_g.vhdl
The output of the VHDL simulation is test_g.out

A serial multiplier using generic components

The VHDL source code for the generic serial multiplier is mul_ser_g.vhdl
The output of the VHDL simulation is mul_ser_g.out

This simulation models a multiplier using "hi" and "lo" registers used
in the MIPS architecture and is similar to the Patterson and Hennessey
example.
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