FIGURE 2


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 A15   A14   A13   A12   A11   A10   A9   A8   A7   A6   A5   A4   A3   A2   A1   A0
   B15   B14   B13   B12   B11   B10   B9   B8   B7   B6   B5   B4   B3   B2   B1   B0  
 C15   C14   C13   C12   C11   C10   C9   C8   C7   C6   C5   C4   C3   C2   C1   C0
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 D15   D14   D13   D12   D11   D10   D9   D8   D7   D6   D5   D4   D3   D2   D1   D0  
 E15   E14   E13   E12   E11   E10   E9   E8   E7   E6   E5   E4   E3   E2   E1   E0  
 F15   F14   F13   F12   F11   F10   F9   F8   F7   F6   F5   F4   F3   F2   F1   F0  
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 G15   G14   G13   G12   G11   G10   G9   G8   G7   G6   G5   G4   G3   G2   G1   G0  
 H15   H14   H13   H12   H11   H10   H9   H8   H7   H6   H5   H4   H3   H2   H1   H0
(a) 
       G15  G14  G13  G12  G11  G10  G9   G8   G7   G6   G5   G4   G3   G2   G1   G0  
       H15  H14  H13  H12  H11  H10  H9   H8   H7   H6   H5   H4   H3   H2   H1   H0  
       J15  J14  J13  J12  J11  J10  J9   J8   J7   J6   J5   J4   J3   J2   J1   J0  
  K16  K15  K14  K13  K12  K11  K10  K9   K8   K7   K6   K5   K4   K3   K2   K1   K0  
       L15  L14  L13  L12  L11  L10  L9   L8   L7   L6   L5   L4   L3   L2   L1   L0  
M16  M15  M14  M13  M12  M11  M10  M9   M8   M7   M6   M5   M4   M3   M2   M1   M0
(b)
Carry-save addition assigns the input operands to 32 full-adder cells (a). The outputs of the first CSA level show six operands remaining to be added (b); these outputs are the inputs to the second CSA level.

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