The document describes the design of an accumulator unit. It shows the control circuit for the accumulator (AC) register, which has three inputs: from the AC register itself, from the data register (DR), and from the input register (INPR). The output of the arithmetic logic unit is connected back to the AC register as an input. The AC register has three control inputs: load (LD), increment (INR), and clear (CLR). It also lists 9 register transfer statements that describe the operations that can be performed on the AC register, such as ANDing, adding, loading, complementing, shifting, clearing, and incrementing its contents.

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:
1) One from AC register,
2) Second from DR register,
3) Third from INPR register.
The output of ALU is connected as an input for AC register.
The register has three control inputs:
1) LD
2) INR
3) CLR

4. Sr. No. Register Transfer Statement Operation
1 D0 T5 : AC  AC ^ DR AND AC with DR
2 D1 T5 : AC  AC + DR Add AC and DR
3 D2 T5 : AC  DR Load AC from DR
4 p B11 : AC(0 – 7)  INPR Load AC from INPR
5 rB9 : AC  AC Complement AC
6 r B7 : AC  Shr AC, A(15)  E Shift right AC
7 r B6 : AC  Shl AC, AC(0)  E Shift left AC
8 r B11 : AC  0 Clear AC
9 r B5 : AC  AC + 1 Increment AC

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