39 porte
Sono abbastanza sicuro che non ci siano progetti più semplici dei miei qui. È stato molto difficile da realizzare. Realizzo anche altri circuiti minimi.
Il ritardo di trasmissione è indicato dalla posizione verso il basso di ciascuna porta NAND sul foglio.
Codice Verilog e test:
// MINIMAL 3 BIT MULTIPLICATOR
//
// The simplest 3 bit multiplicator possible, using 39 NAND gates only.
//
// I have also made multiplicators that are faster, more efficient,
// use different gates, and multiply bigger numbers. And I also do
// hard optimization of other circuits. You may contact me at
// kim.oyhus@gmail.com
//
// This is my entry to win this hard Programming Puzzle & Code Golf
// at Stack Exchange:
// /codegolf/12261/build-a-multiplying-machine-using-nand-logic-gates/
//
// By Kim Øyhus 2018 (c) into (CC BY-SA 3.0)
// This work is licensed under the Creative Commons Attribution 3.0
// Unported License. To view a copy of this license, visit
// https://creativecommons.org/licenses/by-sa/3.0/
module mul3x3 ( in_000, in_001, in_002, in_003, in_004, in_005, out000, out001, out002, out003, out004, out005 );
input in_000, in_001, in_002, in_003, in_004, in_005;
output out000, out001, out002, out003, out004, out005;
wire wir000, wir001, wir002, wir003, wir004, wir005, wir006, wir007, wir008, wir009, wir010, wir011, wir012, wir013, wir014, wir015, wir016, wir017, wir018, wir019, wir020, wir021, wir022, wir023, wir024, wir025, wir026, wir027, wir028, wir029, wir030, wir031, wir032;
nand gate000 ( wir000, in_000, in_005 );
nand gate001 ( wir001, in_000, in_004 );
nand gate002 ( wir002, in_000, in_003 );
nand gate003 ( out000, wir002, wir002 );
nand gate004 ( wir003, in_004, in_001 );
nand gate005 ( wir004, wir003, wir003 );
nand gate006 ( wir005, in_003, in_002 );
nand gate007 ( wir006, wir000, wir005 );
nand gate008 ( wir007, in_004, in_002 );
nand gate009 ( wir008, in_001, in_005 );
nand gate010 ( wir009, wir008, wir007 );
nand gate011 ( wir010, in_001, in_003 );
nand gate012 ( wir011, wir001, wir010 );
nand gate013 ( wir012, out000, wir004 );
nand gate014 ( wir013, wir004, wir012 );
nand gate015 ( wir014, wir011, wir012 );
nand gate016 ( out001, wir014, wir014 );
nand gate017 ( wir015, in_002, in_005 );
nand gate018 ( wir016, wir015, wir015 );
nand gate019 ( wir017, out000, wir016 );
nand gate020 ( wir018, wir017, wir013 );
nand gate021 ( wir019, wir016, wir018 );
nand gate022 ( wir020, wir019, wir009 );
nand gate023 ( wir021, wir020, wir017 );
nand gate024 ( wir022, wir020, wir009 );
nand gate025 ( wir023, wir022, wir021 );
nand gate026 ( out005, wir022, wir022 );
nand gate027 ( wir024, wir016, wir022 );
nand gate028 ( wir025, wir006, wir018 );
nand gate029 ( wir026, wir025, wir006 );
nand gate030 ( wir027, wir025, wir018 );
nand gate031 ( out002, wir026, wir027 );
nand gate032 ( wir028, wir004, wir027 );
nand gate033 ( wir029, wir023, wir028 );
nand gate034 ( wir030, wir028, wir028 );
nand gate035 ( wir031, wir030, wir021 );
nand gate036 ( out004, wir031, wir024 );
nand gate037 ( wir032, wir029, wir031 );
nand gate038 ( out003, wir032, wir032 );
endmodule
module mul3x3_test;
reg [5:0] AB; // C=A*B
wire [5:0] C;
mul3x3 U1 (
.in_000 (AB[0]),
.in_001 (AB[1]),
.in_002 (AB[2]),
.in_003 (AB[3]),
.in_004 (AB[4]),
.in_005 (AB[5]),
.out000 (C[0]),
.out001 (C[1]),
.out002 (C[2]),
.out003 (C[3]),
.out004 (C[4]),
.out005 (C[5])
);
initial AB=0;
always #10 AB = AB+1;
initial begin
$display("\t\ttime,\tA,\tB,\tC");
$monitor("%d,\t%b\t%b\t%b",$time, AB[5:3], AB[2:0],C);
end
initial #630 $finish;
endmodule
// iverilog -o mul3x3_test mul3x3_test.v
// vvp mul3x3_test
Kim Øyhus
