Ling adder

Equations

Ling adder, architecture Skllansky, radix-2, 4-bit

In Borland Turbo Basic 1.1:

'--- Step 0 ------------ Warning --------------------------------------- P00 = A0 OR B0 '1dt, Initial only CLA & Ling Propagate (not in PPA) G00 = A0 AND B0 '1dt, Initial CLA & Ling & PPA Generate D00 = A0 XOR B0 '1dt, Only Ling Initial half bit generate (P0 in PPA) P10 = A1 OR B1 '1dt G10 = A1 AND B1 '1dt D10 = A1 XOR B1 '1dt P20 = A2 OR B2 '1dt G20 = A2 AND B2 '1dt D20 = A2 XOR B2 '1dt P30 = A3 OR B3 '1dt G30 = A3 AND B3 '1dt D30 = A3 XOR B3 '1dt '--- Step 1, Ling Propagate and Generate ------ LG01 = G00 '1dt LG11 = G10 OR G00 '2dt LP11 = P10 '1dt, Sklansky architecture LG21 = G20 '1dt, Sklansky architecture LP21 = P20 AND P10 '2dt LG31 = G30 OR G20 '2dt '--- Step 2, Ling PseudoCarry (H) --------------------------- H0 = LG01 '1dt H1 = LG11 '2dt H2 = LG21 OR (LP11 AND LG11) '4dt TTL, Sklansky architecture ' 1dt 1dt 2dt H3 = LG31 OR (LP21 AND LG11) '4dt TTL ' 2dt 2dt 2dt '--- Sum ----------------------------------------- S0 = (D00 ) '1dt S1 = (D10 AND 1-H0) OR ((D10 XOR P00) AND H0) '4dt TTL S2 = (D20 AND 1-H1) OR ((D20 XOR P10) AND H1) '5dt TTL S3 = (D30 AND 1-H2) OR ((D30 XOR P20) AND H2) '7dt TTL S4 = (( P30) AND H3) '5dt TTL, S4=C4=Cout <sup about="#mwt6" class="mw-ref reference" id="cite_ref-ling_2-0" rel="dc:references" typeof="mw:Extension/ref" data-mw='{"name":"ref","attrs":{"name":"ling"},"body":{"id":"mw-reference-text-cite_note-ling-2"}}'><a href="./Ling_adder#cite_note-ling-2" id="mwFw"><span class="mw-reflink-text" id="mwGA"><span class="cite-bracket" id="mwGQ">[</span>2<span class="cite-bracket" id="mwGg">]</span></span></a></sup>

Ling adder, architecture Kogge-Stone, radix-2, 4-bit

'--- Step 0 ------------ Warning --------------------------------------- P00 = A0 OR B0 '1dt, Initial only CLA & Ling Propagate (not in PPA) G00 = A0 AND B0 '1dt, Initial CLA & Ling & PPA Generate D00 = A0 XOR B0 '1dt, Only Ling Initial half bit generate (P0 in PPA) P10 = A1 OR B1 '1dt G10 = A1 AND B1 '1dt D10 = A1 XOR B1 '1dt P20 = A2 OR B2 '1dt G20 = A2 AND B2 '1dt D20 = A2 XOR B2 '1dt P30 = A3 OR B3 '1dt G30 = A3 AND B3 '1dt D30 = A3 XOR B3 '1dt '--- Step 1 ---------------------------- LG01 = G00 '1dt, Ling Generate LP11 = P10 AND P00 '2dt, Ling Propagate, Kogge-Stone architecture LG11 = G10 OR G00 '2dt LP21 = P20 AND P10 '2dt LG21 = G20 OR G10 '2dt, Kogge-Stone architecture LG31 = G30 OR G20 '2dt '--- Step 2, Ling PseudoCarry ---- H0 = LG01 '1dt H1 = LG11 '2dt H2 = LG21 OR (LP11 AND LG01) '4dt TTL, Kogge-Stone architecture ' 2dt 2dt 1dt H3 = LG31 OR (LP21 AND LG11) '4dt TTL ' 2dt 2dt 2dt '--- Sum ----------------------------------------- S0 = (D00 ) '1dt S1 = (D10 AND 1-H0) OR ((D10 XOR P00) AND H0) '4dt TTL S2 = (D20 AND 1-H1) OR ((D20 XOR P10) AND H1) '5dt TTL S3 = (D30 AND 1-H2) OR ((D30 XOR P20) AND H2) '7dt TTL S4 = (( P30) AND H3) '5dt TTL, S4=C4=Cout <sup about="#mwt9" class="mw-ref reference" id="cite_ref-3" rel="dc:references" typeof="mw:Extension/ref" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-3"}}'><a href="./Ling_adder#cite_note-3" id="mwHQ"><span class="mw-reflink-text" id="mwHg"><span class="cite-bracket" id="mwHw">[</span>3<span class="cite-bracket" id="mwIA">]</span></span></a></sup>