Switch level modeling 2 x4
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The switch level modeling provides an abstraction between logic and transistor levels. It models transistors as either on or off, conducting or not conducting. Interconnect values are abstracted to a small number of discrete signal strengths. A binary decoder converts binary inputs to unique outputs, used for applications like data demultiplexing and memory address decoding. An example decoder is implemented using basic gates like NOT, NAND in a Verilog program and tested with a testbench that applies inputs over time.
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Switch level modeling
This document discusses switch level modeling in Verilog. It describes different types of transistor switches that can be used as primitives in Verilog, including nmos, pmos, rnmos, rpmos, and cmos switches. It also covers bidirectional switches like tran, tranif1, and examples of how to use the switches to model basic logic gates and memory cells like a RAM cell. Time delays can be specified for switches. Switch level modeling allows designing circuits using transistors directly in Verilog.
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Switch level modeling 2 x4
- 1. Switch Level Modeling:- The switch level of modeling provides a level of abstractionbetweenthe logic and analog-transistor levels of abstraction, describing the interconnectionof transmission gates which are abstractionsof individual MOS and CMOS transistors. The switch level transistors are modeled as being either on or off, conducting or not conducting. Further, the values carried by the interconnectionsare abstracted from the whole range of analog voltages or currentsto a small number of discretevalues. These values are referred to as signal strengths. NOT GATE NAND GATE SYNTEX:- Nmos n1(output,data,control) Pmos p1(output,data,control)
- 2. DECODER In digital electronics,a binary decoder is a combinational logic circuit that converts binary information from the n coded inputs to a maximum of 2n unique outputs. They are used in a wide variety of applications, including data DE multiplexing, seven segmentdisplays,and memoryaddress decoding.
- 3. BLOCK DIAGRAM USING BASIC GATES:- TRUTH TABLE:-
- 4. PROGRAM:- module notgate1(x,y); input x; output y; supply0 gnd; supply1 vdd; pmos x1(y,vdd,x); nmos x2(y,gnd,x); endmodule module andgate(a,b,y); input a,b; output y; wire w,w1; supply0 gnd; supply1 vdd; pmos y1(w,vdd,a); pmos y2(w,vdd,b); nmos y3(w1,gnd,b); nmos y4(w,w1,a); notgate1 y5(w,y); endmodule module decoder(a,b,i); input a,b; output [3:0]i; wire abar,bbar; notgate1 z1(a,abar); notgate1 z2(b,bbar); andgate z3(abar,bbar,i[0]); andgate z4(abar,b,i[1]); andgate z5(a,bbar,i[2]); andgate z6(a,b,i[3]); endmodule module decoder_test(); reg a,b; wire [3:0]i; decoder d1(a,b,i); initial begin a=1'b0;b=1'b0; #5 a=1'b0;b=1'b1; #5 a=1'b1;b=1'b0; #5 a=1'b1;b=1'b1; #5 $stop; end endmodule
- 5. WAVEFORM:-