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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>Behavioural data flow description for D-FlipFlop</title>
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<body bgcolor="#66FF99">
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><font size="4"><b>Behavioural
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data flow description for D-Flip Flop</b></font></p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"> </p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0">ENTITY dffres IS<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>PORT (<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>input<span style="mso-spacerun: yes"> </span>: in bit;<span style="mso-tab-count:1">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>clk<span style="mso-spacerun: yes"> </span>: in
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bit;<span style="mso-tab-count:1"> </span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>reset<span style="mso-spacerun: yes"> </span>: in bit; <o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>output<span style="mso-spacerun: yes"> </span>: out bit;<span style="mso-tab-count:1">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>vdd<span style="mso-spacerun: yes"> </span>: in
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bit;<span style="mso-tab-count:1"> </span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>vss<span style="mso-spacerun: yes"> </span>: in
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bit<span style="mso-tab-count:1"> </span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>);<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0">END dffres;<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"> <o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0">ARCHITECTURE VBE OF
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dffres IS<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>SIGNAL<span style="mso-spacerun: yes"> </span>dffres_reg<span style="mso-spacerun:
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yes"> </span>: REG_BIT REGISTER;<span style="mso-tab-count:1">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0">BEGIN<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>ASSERT ((vdd and not (vss)) = '1')<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>REPORT "power supply is missing on dffres"<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>SEVERITY WARNING;<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>dff : BLOCK ( ( clk AND NOT (clk'STABLE)) = '1' )<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>BEGIN<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>dffres_reg <= GUARDED '1' WHEN (reset = '1') else NOT input; <o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>END BLOCK dff;<o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0"><span style="mso-spacerun: yes">
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</span>output <= NOT dffres_reg ;<span style="mso-spacerun: yes">
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</span><o:p>
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</o:p>
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</p>
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<p class="MsoNormal" style="margin-top: 0; margin-bottom: 0">END ;</p>
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</html>
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