Bit line
two stable states, bi-state
17 Matching Annotations
- Feb 2025
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www.cs.columbia.edu www.cs.columbia.edu
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www.cs.columbia.edu www.cs.columbia.edu
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b
this b is different b than the b in the next line nonblocking assignment is taking a snapshot of a,b,c and then write to a,b,c
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Q
On a knife edge, the D will copy its value to Q
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ROM = 1
011-
ROM
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IO = 1
0101 IO
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VIDEO = 1
000- VIDEO
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RAM = 1;
1--- RAM
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z = a - b;
you can write to a variable twice
take precedence
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z = a + b;
take precedence
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z = 4’b0;
default value
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- Jan 2025
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www.cs.columbia.edu www.cs.columbia.edu
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blockingassignment”:use in always_com
the normal equal assignment
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n1(a, b, abn),n1: A mynand2connected to a, b, and abnn2(a, abn, aa),n3(abn, b, bb),n4(aa, bb, y)
instances of a variable
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module mynand2(input logic a, b,output logic y);assign y = ~(a & b);endmodule
module for mynand2:n4
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a & b
division and modulus are actuallly four AND gates
multiply is ??
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Divide
very hard to do in hardware, so avoid
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y = s ? d1 : d0;endmoduley~001d0[3..0]y~101y~201sd1[3..0] y[3..0]y~301
when s =1 , y = d1, and y=d0 when s=0
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this is &a
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