📘 ❞ 12 – Standard Graphic Symbols BY :M. Morris Mano ❝ كتاب ــ إم موريس مانو

عن كتاب 12 – Standard Graphic Symbols BY :M. Morris Mano:
12 – Standard Graphic Symbols
BY :M. Morris Mano

Chapter 12
Standard Graphic Symbols
12.1 RECTANGULAR-SHAPE SYMBOLS
Digital components such as gates, decoders, multiplexers, and registers are available commercially
in integrated circuits and ue classified as SSI or MSI circuits. Standard graphic symbols
have been hveloped for these and other components so that the user can recognize each
function from the unique graphic symbol assigned to it, This standard, known as ANSVIEEE
Std. 9 1 - 1984, has been approved by industry, government, and professional organizations and
is consistent with international standards.
The standard uses a rectangular-shape outline to represent each particular logic function.
Within the outline, there is a general qualifying symbol denoting the logical operation performed
by the unit. For example, the general qualifying symbol for a multiplexer is MUX. The
size of the outline is arbitrary and can be either a square or a rectangular shap with m arbitrary
length-width ratio. Input lines are placed on the left and output lines are placed on tbe rigk
If the direction of signal flow is reversed, it must be indicated by amws.
The rectangular-shape graphic symhls for SSI gates are shown in Fig. 12 1. The pualifying
symbol for the AND gate is the ampersand (&I. The OR gate has h qualifying symbolthat k+
ignates great.terthanorequalto 1,indicatingthatatleastoneinpPtmastk~fmtka#mt
to be active. The symbol for the buffer gate is 1. showing hat& -iqpllC Lw'Ibeaclusive-
OR symbol designates tbe fzathatdy cm ingrrtmwtberriRbPrtkqmbctive.
The inclusion of the logic ntgaih small ckk in tbe ollrpll -e ID W
complement values. Although he -- sgmbolt ehbJPrA.L *
standard also recognizes the dis-vbshspc syddsh lb pllni&25 -
An example of an MSI standard graphic symbol is tb vrdda m
Fig. 12.2, The qualifying symbol formaddais -GnakW-mfm
the arithmetic operands are P and Q. 'Ihe bit-& e-w dmad
a