Design of Accumulator Unit

It is very easy to understand accumulator unit.

1. Name : Koshti Harshad Branch : CE Subject: Computer Organization Subject Code: 2140707 Topic: Design of Accumulator unit

2. Accumulator Unit

3. The above figure shows the control circuit associated with the AC register. As shown in figure , the ALU has three sources of inputs: One from AC register, Second from DR register, Third from INPR register. The output of ALU is connected as an input for AC register. The register has three control inputs : LD INR CLR

4. Sr. No. Register Transfer Statement Operation 1 D T 5 : AC  AC ^ DR AND AC with DR 2 D 1 T 5 : AC  AC + DR Add AC and DR 3 D 2 T 5 : AC  DR Load AC from DR 4 p B 11 : AC(0 – 7)  INPR Load AC from INPR 5 rB 9 : AC  AC Complement AC 6 r B 7 : AC  Shr AC, A(15)  E Shift right AC 7 r B 6 : AC  Shl AC, AC(0)  E Shift left AC 8 r B 11 : AC  0 Clear AC 9 r B 5 : AC  AC + 1 Increment AC

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