1 / 3

5.10 Adders, Subtractor and ALUs

HS=X⊕Y= X·Y+X ·Y CO=X·Y. Return. Next. 5.10 Adders, Subtractor and ALUs. Half Adders and Full Adders. Half adder , adds two 1-bit operands x and y, producing a 2-bit sum. The low-order bit of the sum may be named HS (half sum), and the high-order bit may be named CO (carry out).

amie
Download Presentation

5.10 Adders, Subtractor and ALUs

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. HS=X⊕Y= X·Y+X ·Y CO=X·Y Return Next 5.10 Adders, Subtractor and ALUs • Half Adders and Full Adders • Half adder, adds two 1-bit operands x and y, producing a 2-bit sum. The low-order bit of the sum may be named HS (half sum), and the high-order bit may be named CO (carry out)

  2. S=X⊕Y⊕CIN =X·Y·CIN+X·Y·CIN+X·Y·CIN+X·Y·CIN Return Back Next 5.10 Adders, Subtractor and ALUs • Full adder, Besides the addend-bit inputs x and y, a full adder has a carry-bit input, CIN. And two output bits, S and COUT. COUT=X·Y+X·CIN+Y·CIN (p431 Figure 5-86)

  3. Return Back 5.10 Adders, Subtractor and ALUs • Ripple Adders • Two binary words, each with n bits,can be added using a ripple adder----a cascade of n full-adder stages, each of which handles one bit. • A ripple adder is slow, the total worst-case delay is tADD=tXYCout+(n-2) ·tCinCout+tCinS (p432 Figure 5-87)

More Related