📄 分频器的硬件描述语言设计.mht
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Date: Mon, 27 Aug 2007 23:47:22 +0800
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<P> </P>
<P> </P>
<P class=3Dfont12B =
align=3Dcenter><STRONG>=B7=D6=C6=B5=C6=F7=B5=C4=D3=B2=BC=FE=C3=E8=CA=F6=D3=
=EF=D1=D4=C9=E8=BC=C6 </STRONG></P>
<P align=3Dcenter><STRONG> </STRONG></P>
<BLOCKQUOTE>
<P=20
=
align=3Dleft>=D4=DA=CA=FD=D7=D6=B5=E7=C2=B7=D6=D0=A3=AC=B3=A3=D0=E8=D2=AA=
=B6=D4=BD=CF=B8=DF=C6=B5=C2=CA=B5=C4=CA=B1=D6=D3=BD=F8=D0=D0=B7=D6=C6=B5=B2=
=D9=D7=F7=A3=AC=B5=C3=B5=BD=BD=CF=B5=CD=C6=B5=C2=CA=B5=C4=CA=B1=D6=D3=D0=C5=
=BA=C5=A1=A3=CE=D2=C3=C7=D6=AA=B5=C0=A3=AC=D4=DA=D3=B2=BC=FE=B5=E7=C2=B7=C9=
=E8=BC=C6=D6=D0=CA=B1=D6=D3=D0=C5=BA=C5=CA=C7=D7=EE=D6=D8=D2=AA=B5=C4=D0=C5=
=BA=C5=D6=AE=D2=BB=A1=A3=20
=CF=C2=C3=E6=CE=D2=C3=C7=BD=E9=C9=DC=B7=D6=C6=B5=C6=F7=B5=C4 =
VHDL =
=C3=E8=CA=F6=A3=AC=D4=DA=D4=B4=B4=FA=C2=EB=D6=D0=CD=EA=B3=C9=B6=D4=CA=B1=D6=
=D3=D0=C5=BA=C5 CLK =B5=C4 2 =B7=D6=C6=B5=A3=AC 4 =B7=D6=C6=B5=A3=AC 8 =
=B7=D6=C6=B5=A3=AC 16 =B7=D6=C6=B5=A1=A3=20
=
=D5=E2=D2=B2=CA=C7=D7=EE=BC=F2=B5=A5=B5=C4=B7=D6=C6=B5=B5=E7=C2=B7=A3=AC=D6=
=BB=D0=E8=D2=AA=D2=BB=B8=F6=BC=C6=CA=FD=C6=F7=BC=B4=BF=C9=A1=A3</P>
<P align=3Dleft> </P>
<BLOCKQUOTE>
<P align=3Dleft>LIBRARY IEEE; </P>
<P align=3Dleft>USE IEEE.STD_LOGIC_1164.ALL; </P>
<P align=3Dleft>USE IEEE.STD_LOGIC_ARITH.ALL; </P>
<P align=3Dleft>USE IEEE.STD_LOGIC_UNSIGNED.ALL; </P>
<P align=3Dleft> </P>
<P align=3Dleft>ENTITY clkdiv IS </P>
<BLOCKQUOTE>
<P align=3Dleft>PORT(clk : IN STD_LOGIC; </P>
<BLOCKQUOTE>
<P align=3Dleft>clk_div2 : OUT STD_LOGIC; </P>
<P align=3Dleft>clk_div4 : OUT STD_LOGIC; </P>
<P align=3Dleft>clk_div8 : OUT STD_LOGIC; </P>
<P align=3Dleft>clk_div16 : OUT STD_LOGIC);=20
</P></BLOCKQUOTE></BLOCKQUOTE>
<P align=3Dleft>END clk_div; </P>
<P align=3Dleft> </P>
<P align=3Dleft>ARCHITECTURE rtl OF clk_div IS </P>
<BLOCKQUOTE>
<P align=3Dleft>SIGNAL count : STD_LOGIC_VECTOR(3 DOWNTO 0); =
</P></BLOCKQUOTE>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>PROCESS(clk) </P>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF (clk'event AND clk=3D' 1' ) THEN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF(count=3D=A1=B1 1111=A1=B1 ) THEN </P>
<BLOCKQUOTE>
<P align=3Dleft>Count <=3D (OTHERS =3D>' 0' ); =
</P></BLOCKQUOTE>
<P align=3Dleft>ELSE </P>
<BLOCKQUOTE>
<P align=3Dleft>Count <=3D count +1; =
</P></BLOCKQUOTE>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END PROCESS; </P>
<P align=3Dleft>clk_div2 <=3D count(0); </P>
<P align=3Dleft>clk_div4 <=3D count(1); </P>
<P align=3Dleft>clk_div8 <=3D count(2); </P>
<P align=3Dleft>clk_div16 <=3D count(3); =
</P></BLOCKQUOTE>
<P align=3Dleft>END rtl; </P>
<P align=3Dleft> </P></BLOCKQUOTE>
<P align=3Dleft>=B6=D4=D3=DA=B7=D6=C6=B5=B1=B6=CA=FD=B2=BB=CA=C7 =
2=20
=
=B5=C4=D5=FB=CA=FD=B4=CE=C3=DD=B5=C4=C7=E9=BF=F6=A3=AC=CE=D2=C3=C7=D6=BB=D0=
=E8=D2=AA=B6=D4=D4=B4=B4=FA=C2=EB=D6=D0=B5=C4=BC=C6=CA=FD=C6=F7=BD=F8=D0=D0=
=D2=BB=CF=C2=BC=C6=CA=FD=BF=D8=D6=C6=BE=CD=BF=C9=D2=D4=C1=CB=A3=AC=C8=E7=CF=
=C2=C3=E6=D4=B4=B4=FA=C2=EB=C3=E8=CA=F6=D2=BB=B8=F6=B6=D4=CA=B1=D6=D3=D0=C5=
=BA=C5=BD=F8=D0=D0 6 =B7=D6=C6=B5=B5=C4=B7=D6=C6=B5=C6=F7=A1=A3 </P>
<P align=3Dleft> </P>
<BLOCKQUOTE>
<P align=3Dleft>ENTITY clkdiv IS </P>
<BLOCKQUOTE>
<P align=3Dleft>PORT(clk : IN STD_LOGIC; </P>
<BLOCKQUOTE>
<P align=3Dleft>clk_div6 : OUT STD_LOGIC);=20
</P></BLOCKQUOTE></BLOCKQUOTE>
<P align=3Dleft>END clk_div; </P>
<P align=3Dleft> </P>
<P align=3Dleft>ARCHITECTURE rtl OF clk_div IS </P>
<BLOCKQUOTE>
<P align=3Dleft>SIGNAL count : STD_LOGIC_VECTOR(1 DOWNTO 0); =
</P>
<P align=3Dleft>SIGNAL clk_temp : STD_LOGIC; =
</P></BLOCKQUOTE>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>PROCESS(clk) </P>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF (clk'event AND clk=3D' 1' ) THEN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF(count=3D=A1=B1 10=A1=B1 ) THEN </P>
<P align=3Dleft>count <=3D (OTHERS =3D>' 0' ); =
</P>
<P align=3Dleft>clk_temp <=3DNOT clk_temp; </P>
<P align=3Dleft>ELSE </P>
<P align=3Dleft>count <=3D count +1; </P>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END PROCESS; </P>
<P align=3Dleft>clk_div6 <=3D clk_temp; </P></BLOCKQUOTE>
<P align=3Dleft>END rtl; </P></BLOCKQUOTE>
<P align=3Dleft> </P>
<P =
align=3Dleft>=C7=B0=C3=E6=C1=BD=B8=F6=B7=D6=C6=B5=C6=F7=B5=C4=C0=FD=D7=D3=
=C3=E8=CA=F6=B5=C4=BD=AB=CA=B1=D6=D3=D0=C5=BA=C5=BD=F8=D0=D0=B7=D6=C6=B5=A3=
=AC=B7=D6=C6=B5=BA=F3=B5=C3=B5=BD=B5=C4=CA=B1=D6=D3=D0=C5=BA=C5=B5=C4=D5=BC=
=BF=D5=B1=C8=CE=AA 1 =A3=BA 1=20
=
=A1=A3=D4=DA=BD=F8=D0=D0=D3=B2=BC=FE=C9=E8=BC=C6=B5=C4=CA=B1=BA=F2=A3=AC=CD=
=F9=CD=F9=D2=AA=C7=F3=B5=C3=B5=BD=D2=BB=B8=F6=D5=BC=BF=D5=B1=C8=B2=BB=CA=C7=
1 =A3=BA 1 =
=B5=C4=B7=D6=C6=B5=D0=C5=BA=C5=A3=AC=D5=E2=CA=B1=C8=D4=B2=C9=D3=C3=BC=C6=CA=
=FD=C6=F7=B5=C4=B7=BD=B7=A8=C0=B4=B2=FA=C9=FA=D5=BC=BF=D5=B1=C8=B2=BB=CA=C7=
1 =A3=BA 1=20
=
=B5=C4=B7=D6=C6=B5=D0=C5=BA=C5=A1=A3=CF=C2=C3=E6=D4=B4=B4=FA=C2=EB=C3=E8=CA=
=F6=B5=C4=CA=C7=D5=E2=D1=F9=D2=BB=B8=F6=B7=D6=C6=B5=C6=F7=A3=BA=BD=AB=CA=E4=
=C8=EB=B5=C4=CA=B1=D6=D3=D0=C5=BA=C5=BD=F8=D0=D0 16 =
=B7=D6=C6=B5=A3=AC=B7=D6=C6=B5=D0=C5=BA=C5=B5=C4=D5=BC=BF=D5=B1=C8=CE=AA =
1 =A3=BA 15=20
=
=A3=AC=D2=B2=BE=CD=CA=C7=CB=B5=A3=AC=C6=E4=D6=D0=B8=DF=B5=E7=CE=BB=B5=C4=C2=
=F6=B3=E5=BF=ED=B6=C8=CE=AA=CA=E4=C8=EB=CA=B1=D6=D3=D0=C5=BA=C5=B5=C4=D2=BB=
=B8=F6=D6=DC=C6=DA=A1=A3 </P>
<BLOCKQUOTE>
<P align=3Dleft>LIBRARY IEEE; </P>
<P align=3Dleft>USE IEEE.STD_LOGIC_1164.ALL; </P>
<P align=3Dleft>USE IEEE.STD_LOGIC_ARITH.ALL; </P>
<P align=3Dleft>USE IEEE.STD_LOGIC_UNSIGNED.ALL; </P>
<P align=3Dleft> </P>
<P align=3Dleft>ENTITY clkdiv IS </P>
<BLOCKQUOTE>
<P align=3Dleft>PORT(clk : IN STD_LOGIC; </P>
<BLOCKQUOTE>
<P align=3Dleft>clk_div16 : OUT STD_LOGIC);=20
</P></BLOCKQUOTE></BLOCKQUOTE>
<P align=3Dleft>END clk_div; </P>
<P align=3Dleft> </P>
<P align=3Dleft>ARCHITECTURE rtl OF clk_div IS </P>
<BLOCKQUOTE>
<P align=3Dleft>SIGNAL count : STD_LOGIC_VECTOR(3 DOWNTO 0); =
</P></BLOCKQUOTE>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>PROCESS(clk) </P>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF (clk'event AND clk=3D' 1' ) THEN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF(count=3D=A1=B1 1111=A1=B1 ) THEN </P>
<P align=3Dleft>Count <=3D (OTHERS =3D>' 0' ); =
</P>
<P align=3Dleft>ELSE </P>
<P align=3Dleft>Count <=3D count +1; </P>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END PROCESS; </P>
<BLOCKQUOTE>
<P align=3Dleft> </P></BLOCKQUOTE>
<P align=3Dleft>PROCESS(clk) </P>
<P align=3Dleft>BEGIN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF (clk'event AND clk=3D' 1' ) THEN </P>
<BLOCKQUOTE>
<P align=3Dleft>IF(count=3D=A1=B1 1111=A1=B1 ) THEN </P>
<P align=3Dleft>Clk_div16 <=3D =A1=AE 1' ; </P>
<P align=3Dleft>ELSE </P>
<P align=3Dleft>Clk_div <=3D =A1=AE 0' ; </P>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END IF ; </P></BLOCKQUOTE>
<P align=3Dleft>END PROCESS; </P></BLOCKQUOTE>
<P align=3Dleft>END rtl; </P></BLOCKQUOTE>
<P align=3Dleft> </P>
<P=20
=
align=3Dleft>=B6=D4=D3=DA=C9=CF=CA=F6=D4=B4=B4=FA=C2=EB=C3=E8=CA=F6=B5=C4=
=D5=E2=D6=D6=B7=D6=C6=B5=C6=F7=A3=AC=D4=DA=D3=B2=BC=FE=B5=E7=C2=B7=C9=E8=BC=
=C6=D6=D0=D3=A6=D3=C3=CA=AE=B7=D6=B9=E3=B7=BA=A3=AC=C9=E8=BC=C6=C8=CB=D4=B1=
=B3=A3=B2=C9=D3=C3=D5=E2=D6=D6=B7=D6=C6=B5=C6=F7=C0=B4=B2=FA=C9=FA=D1=A1=CD=
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