Switch Level Modeling part 1

... nmos and pmos switches are shown in Figure 11 -1 . Figure 11 -1. NMOS and PMOS Switches In Verilog, nmos and pmos switches are instantiated as shown in Example 11 -1 . Example 11 -1 Instantiation ... for a cmos switch is shown in Figure 11 -2 . Figure 11 -2. CMOS Switch A cmos switch is instantiated as shown in Example 11 -2 . Example 11 -2 Instantiation of CMOS Sw...

Ngày tải lên: 20/10/2013, 16:15

... for a level- sensitive CMOS latch is shown in Figure 11 -6 . Figure 11 -6. CMOS flipflop The switches C1 and C2 are CMOS switches, discussed in Section 11 .1. 2 , CMOS Switches. Switch C1 is ... blocks, they use switch- level modeling. 11 .2.2 2-to -1 Multiplexer A 2-to -1 multiplexer can be defined with CMOS switches. We will use the my_nor gate declared in Section 11...

Ngày tải lên: 20/10/2013, 16:15

... 0 010 , B= 010 1, C_IN= 0, C_OUT= 0, SUM= 011 1 15 A= 10 01, B =10 01, C_IN= 0, C_OUT= 1, SUM= 0 010 20 A= 10 10, B =11 11, C_IN= 0, C_OUT= 1, SUM= 10 01 25 A= 10 10, B= 010 1, C_IN= 1, , C_OUT= 1, SUM= ... select signals is tested. IN0= 1, IN1= 0, IN2= 1, IN3= 0 S1 = 0, S0 = 0, OUTPUT = 1 S1 = 0, S0 = 1, OUTPUT = 0 S1 = 1, S0 = 0, OUTPUT = 1 S1 = 1, S...

Ngày tải lên: 15/12/2013, 03:15

... blocks will be as follows. time statement executed 0 m = 1& apos;b0; 5 a = 1& apos;b1; 10 x = 1& apos;b0; 30 b = 1& apos;b0; 35 y = 1& apos;b1; 50 $finish; The initial blocks are typically used ... initial begin #5 a = 1& apos;b1; //multiple statements; need to be grouped #25 b = 1& apos;b0; end initial begin #10 x = 1& apos;b0; #25 y = 1& apos;b1; end in...

Ngày tải lên: 28/10/2013, 22:15

... time units. initial begin A= 1& apos;b0; B= 1& apos;b0; C= 1& apos;b0; #10 A= 1& apos;b1; B= 1& apos;b1; C= 1& apos;b1; #10 A= 1& apos;b1; B= 1& apos;b0; C= 1& apos;b0; #20 $finish; end ... and #(5) a1(e, a, b); //Delay of 5 on gate a1 or #(4) o1(out, e,c); //Delay of 4 on gate o1 endmodule This module is tested by the stimulus file shown in Example 5 -13 . E...

Ngày tải lên: 15/12/2013, 03:15

... vector nets. addr is a 16 -bit vector net // addr1 and addr2 are 16 -bit vector registers. assign addr [15 :0] = addr1_bits [15 :0] ^ addr2_bits [15 :0]; // Concatenation. Left-hand side is a concatenation ... used in gate -level modeling. //Net Delays wire # 10 out; assign out = in1 & in2; //The above statement has the same effect as the following. wire out; assign #10...

Ngày tải lên: 26/01/2014, 14:20

... IN C: THE ART OF SCIENTIFIC COMPUTING (ISBN 0-5 21- 4 310 8-5) Copyright (C) 19 88 -19 92 by Cambridge University Press.Programs Copyright (C) 19 88 -19 92 by Numerical Recipes Software. Permission is ... website http://www.nr.com or call 1- 800-872-7423 (North America only),or send email to trade@cup.cam.ac.uk (outside North America). Chapter 15 . Modeling of Data 15 .0 Introductio...

Ngày tải lên: 15/12/2013, 04:15

... designing optimized circuits for leaf -level cells. They build higher -level cells by using these leaf cells. The flow meets at an intermediate point where the switch- level circuit designers have created ... terms of a gate- level logic diagram. • Switch level This is the lowest level of abstraction provided by Verilog. A module can be implemented in terms of switches, stor...

Ngày tải lên: 24/12/2013, 11:17