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# digital hardware des

microprogramming Writing microcode is often called microprogramming and the microcode in a particular processor implementation is sometimes called a microprogram.
Hardwired control units Hardwired control units are implemented through use of sequential logic units, featuring a finite number of gates that can generate specific results based on the instructions that were used to invoke those responses. Hardwired control units are generally
Reduced instruction set computing Reduced instruction set computing, or RISC /ˈrɪsk/, is a CPU design strategy based on the insight that simplified (as opposed to complex) instructions can provide higher performance if this simplicity enables much faster execution of each instruction.
programmable logic array (PLA) A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logic circuits. The PLA has a set of programmable AND gate planes, which link to a set of programmable OR gate planes, which can then be conditionally
canonical form. Definition: Any Boolean function that is expressed as a sum of minterms or as a product of maxterms is said to be in its canonical form.
Maxterms For a boolean function of n variables {x_1,\dots,x_n}, a sum term in which each of the n variables appears once (in either its complemented or uncomplemented form) is called a maxterm. Thus, a maxterm is a logical expression of n variables that employs on
Half adder The half adder adds two single binary digits A and B. It has two outputs, sum (S) and carry (C). The carry signal represents an overflow into the next digit of a multi-digit addition. The value of the sum is 2C + S. The simplest half-adder design, picture
Full adder A full adder adds binary numbers and accounts for values carried in as well as out. A one-bit full adder adds three one-bit numbers, often written as A, B, and Cin; A and B are the operands, and Cin is a bit carried in from the next less significant stage
Ripple-carry adder It is possible to create a logical circuit using multiple full adders to add N-bit numbers. Each full adder inputs a Cin, which is the Cout of the previous adder. This kind of adder is called a ripple-carry adder, since each carry bit "ripples" to the nex
datapath A datapath is a collection of functional units, such as arithmetic logic units or multipliers, that perform data processing operations. It is a central part of many central processing units (CPUs) along with the control unit, which largely regulates inter
Created by: skrobin