1.1. Substantiation
of subject topicality
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Wide introduction
of electronics and automatics in all fields of activity
of a human society, puts forward more rigid requirements
to electronic products. Now for realization of digital
systems as hardware basis programmed logic devices with
various architecture are used. Application of this basis
allows increasing reliability, speed, a degree of integration
of designed devices, and also it is essential to lower
time of designing and constructing, consumption of power
and dimensions of devices.
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Modern digital
systems constructis on the basis of a principle of microprogram
management which assumes presence of the control device,
in particular the microprogram control device, which
coordinating work of all blocks of system. Two basic
classes of microprogram control devices are "rigid"
logic machines, representing sequential scheme synthesized
by the description, set by the abstract automatic device;
and also "programmed" logic machines, based on operational-address
representation of information stored in special control
memory. These classes possess a number of problems which
with success are solved by microprogram control devices
presented in the form of a composition of machines with
"rigid" and "programmed" logic which have received the
name of composite microprogram control devices (CMCD).
The similar approach promotes reduction in hardware
expenses in the scheme and to increase in speed of the
device. But also the scheme in that case becomes specialized,
that limits an opportunity of an effective utilization
of micro programming at a user level.
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1.2. The
object and tasks of work
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The object of work
is reduction of cost and increase in speed synthesized
microprogram control device, by minimization of the
logic scheme due to application of structure with the
converter "number of input - the address of input".
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For achievement
of an object in during researches it is necessary:
- To analyze existing structures and methods of
synthesis microprogram control device in CPLD basis,
and also the review of actual CPLD.
- To develop structure of microprogram control device,
allowing optimizing hardware expenses and speed
of scheme of microprogram control device in its
realization in CPLD.
- To develop the software (CAD), allowing to automate
process of synthesis CMCD on the basis of algorithm
and to receive the description of its scheme in
VHDL.
- To research characteristics of schemes of microprogram
control devices with use of the offered structure,
and also to compare the received characteristics
to characteristics of microprogram control device
in which other structures are applied.
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1.3. Prospective
scientific novelty and planned scientific value
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Scientific novelty
of the received results of dissertational work consists
in development of structure CMCD focused on minimization
of cost and increase of speed of microprogram control
device.
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Planned scientific
value consists in the following:
- Structure of CMCD with improved characteristics
in CPLD is developed.
- The CAD, allowing automating process of synthesis
of CMCD on the basis of algorithm is developed.
Result of work of the program is the description
of scheme CMCD in VHDL.
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2.1. The
description of the received results
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Preliminary researches
of structure with the converter "number of input - address
of input" have shown a clear advantage in comparison
with base structure. At increase in amount of operational
vertices, the economy of number of equivalent gates
at application of the described structure grows.
Results can be seen on the graphics.
The Y-axis represents quantity of equivalent gates
and X-axis represent word length needed to adress
operational vertices of devise.
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2.2. Conclusions
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Carried out researches
have shown, that in comparison with base structure,
application of the offered structure allows to lower
hardware expenses because for coding states, codes of
smaller word length are used, than for addressing set
of operational vertices of algorithm.
The further researches are directed on adaptation of
the offered structure to modern CPLD, and also on development
of methods of optimization of the presented scheme,
in particular on research of possible minimization of
the field which are responsible for coding of microcommands.
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2.3. Literature
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- Баркалов О.О. Синтез операційних пристроїв. –
Донецьк: РВА ДонНТУ, 2003. – 305 с.
- Соловьёв В.В. Проектирование цифровых систем на
основе программируемых логических интегральных схем.
– 2-е изд., стереотип. – М.: Горячая линия-Телеком,
2007. – 636 с. ил.
- Баркалов А.А., Палагин А.В. Синтез микропрограммных
устройств управления. - Киев: ИК НАН Украины, 1997.
- 156с.
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