# *** This Is Logic Diagram For A 4×3 Memory. Each Row Is One Of The Four 3-bit Words. A Read Or Write Operation Always Reads Or Writes A Complete Word. (a) What Type Of Combinational Circuit Is Formed By The Leftmost 4 AND Gates “powered” Bythe A0 And A1 Signals? (b) Explain The Purpose Of The Tri-state Noninverting Buers Whose Outputs Are O0, O1 And O2.

Transcribed Text:Question: *** This is Logic Diagram for a 4×3 memory. Each row is one of t—
Q

Data in

‘Output enable = CS + RD – OF

*** This is Logic Diagram for a 4×3 memory. Each row is one of the four 3-bit words. A read or write
operation always reads or writes a complete word.

(b) Explain the purpose of the tri-state noninverting buers whose outputs are 00, Ol and 02.

[Lo |

Le |
Solution:

a)

The combinational circuit formed by the leftmost 4 AND gates “powered” by the AO and Al signals

is 2-to-4 Line Decoder.Who is actually decoding 2 bit Al & Ao inputs in to 4-Bit output taken from the AND.
gates.

the purpose of the tri-state noninverting buers whose outputs are ©0, Ol and O2 sto let the signal pass
through by mean of selection bit comming from Qutput enable Another function of buffer here is to boost
the current as current attenuates while travelinng through the circuit and being processed, so buffers are
employed to level them up.