📄 chapter18 fsm.mht
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Subject: Chapter 18 FSM
Date: Sun, 15 Feb 2004 15:49:29 +0800
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Chapter 18 FSM</TITLE>
<META content=3D"text/html; charset=3Dgb2312" http-equiv=3DContent-Type>
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<H1>=B5=DA=CA=AE=B0=CB=D5=C2 =
=D3=D0=CF=DE=D7=B4=CC=AC=BB=FA=C6=F7</H1> =20
<TABLE border=3D0 width=3D"90%">
<TBODY>
<TR>
<TD> =20
=
=BB=F9=B1=BE=B5=C4=CA=FD=CE=BB=C2=DF=BC=AD=CF=DF=C2=B7=BF=C9=BD=F8=D2=BB=B2=
=BD=B7=D6=B3=C9=D7=E9=BA=CF=C2=DF=BC=AD=D3=EB=D1=AD=D0=F2=C2=DF=BC=AD=A3=AC=
=D7=E9=BA=CF=C2=DF=BC=AD=B5=C4=D0=F0=CA=F6=B1=C8=BD=CF=D6=B1=BD=D3=BC=F2=B5=
=A5=A3=AC=D2=D7=EC=B6=C1=CB=BD=E2=A3=AC=D1=AD=D0=F2=C2=DF=BC=AD=B5=C4=C4=A3=
=D0=CD=D6=DA=B6=E0=A3=AC=CF=EB=D2=AA=D5=FD=C8=B7=C3=E8=CA=F6=BE=CD=D0=E8=D2=
=AA=D2=BB=D0=A9=B6=D4=EC=B6=C4=A3=D0=CD=B5=C4=C1=CB=BD=E2=A1=A3 =20
<P>=D1=A7=CF=B0=C4=BF=B1=EA =20
<UL>
=
<LI>=C1=CB=BD=E2=B3=A3=D3=C3=B5=C4=D3=D0=CF=DE=D7=B4=CC=AC=BB=FA=C6=F7=A3=
=A8FSM=A3=A9=C4=A3=D0=CD=20
=
<LI>=C9=E8=BC=C6=BF=C9=D2=D4=D7=F7=C2=DF=BC=AD=BA=CF=B3=C9=B5=C4=D1=AD=D0=
=F2=C2=DF=BC=AD </LI></UL></TD></TR></TBODY></TABLE>18.1 =
=B3=A3=D3=C3=B5=C4FSM=C4=A3=D0=CD <BR> =20
<TABLE border=3D0 cols=3D1 width=3D"90%">
<TBODY>
<TR>
<TD> =20
=
=D5=E2=D2=BB=D0=A1=BD=DA=C4=DA=A3=AC=CE=D2=C3=C7=BF=C9=BD=E9=C9=DC=D2=BB=D6=
=D6=D7=EE=CD=A8=D3=C3=B5=C4FSM=C4=A3=D0=CD=A3=AC=B0=FC=BA=AC=D3=D0Mealy =
Machine=D3=EBMoore=20
=
Machine=C1=BD=D6=D6=C4=A3=D0=CD=B5=C4=BB=FA=D6=C6=A1=A3=CF=C8=BF=B4=BF=B4=
=CD=BC18-1=B5=C4=D0=CD=CC=AC=A1=A3 <BR> =20
<TABLE border=3D1 width=3D"90%">
<TBODY>
<TR>
<TD><IMG height=3D336=20
=
src=3D"file:///E:/10%20H%20D%20L/Verilog/%5B1%5D=CC=A8=CD=E5=C7=E5=BB=AAV=
erilog%20HDL=BD=CC=B3=CC/fig18-0.gif"=20
width=3D801></TD></TR></TBODY></TABLE>=CD=BC18-1 =
=B4=AB=CD=B3=B5=C4FSM=20
=
<P>=C0=B4=BF=B4=BF=B4=CF=E0=B6=D4=D3=A6=B5=C4=B3=CC=CA=BD=C2=EB=A1=A3&nbs=
p; <BR> =20
<TABLE border=3D0 cols=3D1 width=3D"90%">
<TBODY>
<TR>
<TD>module classical (a, clk, mealy, moore); =20
<P> input a, clk; // a=20
=
=CA=E4=C8=EB=A3=AC=BF=C9=D2=D4=D3=D0=BA=DC=B6=E0=A3=BBclk=CA=B1=D6=D3=D1=B6=
=BA=C5=A3=ACFSM=D2=BB=B6=A8=D3=D0=B5=C4=CA=E4=C8=EB =20
=
<BR> &nb=
sp; &nbs=
p;=20
// =
=CD=A8=B3=A3=BB=B9=BB=E1=BC=D3=C9=CFset/reset=B5=C4=CA=E4=C8=EB=A3=AC=C8=C3=
FSM=B5=C4=D7=B4=CC=AC=BF=C9=D2=D4=BB=D8=B5=BD=C6=F0=CA=BC=B5=E3 =20
<P> output mealy; // Mealy machine's =
output, can=20
be single bit or vector <BR> output =
moore;=20
// Moor machine's output, can be single bit or vector =20
<P> reg mealy, moore; // =
=C1=BD=D6=D6=BB=FA=C6=F7=B5=C4=D7=B4=CC=AC=A3=AC=D2=BB=B6=A8=D3=C3reg=D7=F7=
=D0=FB=B8=E6 =20
<BR> reg [1:0] present_state, next_state; =
//=20
=
=D3=D0=D7=B4=CC=AC=A3=AC=BE=CD=D3=D0=B7=D6=C7=B0=D7=B4=CC=AC=A3=AC=D3=EB=CF=
=D6=D4=DA=D7=B4=CC=AC=A3=AC=BB=F2=CF=C2=D2=BB=B8=F6=D7=B4=CC=AC =20
<P> parameter [1:0] S0=3D0, S1=3D1, =
S2=3D2;=20
=
//=D7=B4=CC=AC=D0=FB=B8=E6=A3=AC=D5=E2=B1=DF=D0=FB=B8=E6=D2=BB=B8=F6=C1=BD=
=CE=BB=D4=AA=B5=C4=D7=B4=CC=AC=A3=AC=B9=B2=D3=D0=CB=C4=D6=D6=D7=B4=CC=AC&=
nbsp;=20
=
<BR>//=D6=BB=D0=FB=B8=E6=C6=E4=D6=D0=C8=FE=B8=F6=A3=AC=B4=ED=CE=F3=CA=BE=B7=
=B6=A3=AC=D3=A6=B8=C3=D2=AA=B0=D1=CB=F9=D3=D0=BF=C9=C4=DC=B6=BC=D0=FB=B8=E6=
=B3=F6=C0=B4=A3=AC=B1=DC=C3=E2=CE=B4=D6=AA=D7=B4=CC=AC=B5=C4=B4=ED=CE=F3=B7=
=A2=C9=FA =20
<P> always @ (posedge clk) //=20
=
=CD=A8=B3=A3=D6=BB=D4=DA=D5=FD=D4=B5=B4=A5=B7=A2=B2=C5=B8=FC=D0=C2=D7=B4=CC=
=AC=A3=AC=D5=FD=B8=BA=D4=B5=B6=BC=D3=C3=B5=BD=B5=C4=C9=E8=BC=C6=BD=CF=C4=D1=
=D2=D4=BA=CF=B3=C9 <BR> =20
begin <BR> =20
present_state =3D next_state; <BR> =
end =20
<P> always @ (present_state or a)=20
=
//=C8=E7=B9=FB=D7=B4=CC=AC=D3=D0=B1=E4=A3=AC=BB=F2=CA=C7=CA=E4=C8=EB=D6=B5=
=D3=D0=B1=E4=A3=AC=BE=CD=D2=AA=BF=B4=BF=B4=D7=B4=CC=AC=CA=C7=B7=F1=B8=C3=B1=
=E4=BB=AF <BR> =20
begin <BR> =20
next_state =3D present_state; =20
<BR> mealy =3D =
0; =20
<BR> moore =3D =
0; =20
<BR> case=20
(present_state) =20
=
<BR> =20
S0: begin =20
=
<BR> &nb=
sp; =20
if (a) =20
=
<BR> &nb=
sp; =20
next_state =3D S1; =20
=
<BR> &nb=
sp; =20
else =20
=
<BR> &nb=
sp; =20
next_state =3D S0; =20
=
<BR> &nb=
sp; =20
end =20
=
<BR> =20
S1: begin =20
=
<BR> &nb=
sp; =20
if (!a) =20
=
<BR> &nb=
sp; =20
next_state =3D S2; =20
=
<BR> &nb=
sp; =20
else =20
=
<BR> &nb=
sp; =20
begin =20
=
<BR> &nb=
sp; =20
mealy =3D 1; =20
=
<BR> &nb=
sp; =20
next_state =3D S1; =20
=
<BR> &nb=
sp; =20
end =20
=
<BR> &nb=
sp; =20
end =20
=
<BR> =20
S2: begin =20
=
<BR> &nb=
sp; =20
moore =3D 1; =20
=
<BR> &nb=
sp; =20
if (a) =20
=
<BR> &nb=
sp; =20
next_state =3D S2; =20
=
<BR> &nb=
sp; =20
else =20
=
<BR> &nb=
sp; =20
next_state =3D S0; =20
=
<BR> &nb=
sp; =20
end =20
=
<BR> =20
default:begin=20
=
<BR> &nb=
sp; =20
next_state=3D S1;=20
=
<BR> &nb=
sp; =20
end <BR> // =
default=D5=E2=D2=BB=B6=CE=D0=F0=CA=F6=D2=BB=B6=A8=D2=AA=BC=D3=C8=EB=A3=AC=
=C8=C3=BA=CF=B3=C9=C8=ED=CC=E5=D6=AA=B5=C0=A3=AC=CE=B4=D6=B8=B6=A8=CA=E4=C8=
=EB=D7=E9=BA=CF=A3=AC=B6=D4=D3=A6=B5=BD=D5=E2=D2=BB=B8=F6=D7=B4=CC=AC=20
<BR> endcase =
<BR> end <BR>endmodule =20
<BR> </P></TD></TR></TBODY></TABLE>
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