Digital logic circuit The basic logic functional units that perform primitive logic functions are called gates A 8 翻F(ABC)=AB+ABC+ABC 8 8
Digital logic circuit • The basic logic functional units that perform primitive logic functions are called gates. & A F B C & & + F(A,B,C)=AB+AB’C’+A’BC
Digital logic circuit The work signal is restricted to two binary values o. 1 o and 1 are logic value They can represent the voltage level of a circuit 1 is high level and o is low They also can represent the two states of transistors, conduct is defined as logic 1 and cutoff is logic O
Digital logic circuit • The work signal is restricted to two binary values 0, 1. – 0 and 1 are logic value. – They can represent the voltage level of a circuit , 1 is high level and 0 is low. – They also can represent the two states of transistors, conduct is defined as logic 1 and cutoff is logic 0
Digital logic circuit Studying the digital circuit we are concerned with the relationship between the input and output, the function it provide, not the internal detail Digital integrated circuits, constructed from electronic components, are designed to perform specified logic functions Simple integrated circuits contain a few logic gates is called small-scale integration(SSI contains 0 to 9 gates) Medium-scale integration(MSI contains 10 to 99 gates) Large-scale integration (LSI contains 100 or more gates Very large-scale integration (vLsi does not have a gate count but is usually thought of as more than 1000 gates)
Digital logic circuit • Studying the digital circuit , we are concerned with the relationship between the input and output, the function it provide, not the internal detail. • Digital integrated circuits, constructed from electronic components, are designed to perform specified logic functions. – Simple integrated circuits contain a few logic gates is called small-scale integration (SSI contains 0 to 9 gates) – Medium-scale integration (MSI contains 10 to 99 gates) – Large-scale integration (LSI contains 100 or more gates) – Very large–scale integration (VLSI does not have a gate count but is usually thought of as more than 1000 gates)
Digital logic circuit Level five Complex Systems, Function Units from levels Two through Four evel four More complex Function Logic Units, e.g. Third IC level(VLSI) microprocessor Level three Function Logic Units, e.g. adders Second ic level counters, multiplexers (MSI and LSI) Level two Function Logic Units, e.g. gates, NOT, AND, NAND, EX-OR First IC level (SSI) Level one Electronic Components, e.g. transistors, Components level diodes, resistors, capacitors
Digital logic circuit Components level First IC level (SSI) Level four Level three Level five Electronic Components, e.g. transistors, diodes, resistors, capacitors Function Logic Units, e.g. gates, NOT, AND, NAND, EX-OR Function Logic Units, e.g. adders, counters, multiplexers More complex Function Logic Units, e.g. microprocessor Complex Systems, Function Units from levels Two through Four Third IC level (VLSI) Second IC level (MSI and LSI) Level two Level one