❞ مذكّرة 06 – Registers and Counters :M. Morris Mano ❝ ⏤ إم موريس مانو

06 – Registers and Counters
BY :M. Morris Mano

Chapter 6
ters and Col
4.1 REClSf ERS
A clccked sequential circuit consists of n group of £lip-flops and combinational gates connected
to form a feedback path. The flip-flops are essential because. in their absence, the
circuit reduces to a purely combinational circuit (provided that there is no feedback among
the gates). A circuit with flip-flops is considered a sequential circuit even in the absence of
combinational gates. Circuits that include flip-flops are usually classified by the function
they perform rather than by the name of the sequential circuit. Two such circuits are registers
and counters.
A register is a group of flip-flops, each one of which is capable of ssroring one bit of
information. An n-bit register consists of a group of n flip-flops capable of storing n bits of
binary information. In addition to the flip-flops, a register may have combinational gates
that perform certain data-processing tasks. In its broadest definition, a register consists of
a group of flip-flops together with gates that affect their operation. The flip-flops hold the
binary information, and the gates determine how the information is transferred into the
register.
A counter is essentially a register that goes though a preduermined sequence of binary
states. The gates in the counter are corutectGd in such a way as to duce the prescn'bed sequence
of states. Although counters are a special type of register, it is common to differentiate
them by giving them a different name.
Various types of registers are avdable commercially. The simplest register is one that consists
of only flip-flops, without any gates. figure 6.1 shows such amgister constructed with four
D-type flipflops to form a four-bit data storage register. The common clock input triggers all
flipflops on the positive edge of each pulse, and the binary data available at the four inputs are
إم موريس مانو - ❰ له مجموعة من الإنجازات والمؤلفات أبرزها ❞ Introduction Digital Design M. Morris Mano ❝ ❞ Solution Manual – Digital Design 4th Ed - MorrisMano P1-P294 ❝ ❞ 02 – Boolean Algebra and Logic Gates ❝ ❞ Digital Design With an Introduction to the Verilog HDL FIFTH EDITION ❝ ❞ 10 – Digital Intergrated Circuts BY :M. Morris Mano ❝ ❞ 12 – Standard Graphic Symbols BY :M. Morris Mano ❝ ❞ M. Morris Mano 01 – Digital Systems and Binary Numbers ❝ ❞ 13 – Index BY :M. Morris Mano ❝ ❞ 09 – Asynchronous Sequential Logic :M. Morris Mano ❝ ❱
من الكتب التقنية والحاسوبية العامة - مكتبة كتب تقنية المعلومات.