RISCQ

Designed a basic computer that called RISCQ. RISCQ has registers, two memories, arithmetic and logic unit, control unit and bus system.

Contents

Registers

RISCQ has 9 registers which are Address Register, Program Counter, Input Register, Output Register, Instruction Register and 4 general purpose registers.

Register Symbol	Register name	Number of bits	Function
AR	Address Register	5	Holds address for data memory. It can be cleared with related control signal.
PC	Program Counter	5	Holds address of instruction. It can be cleared and increase by one with related control signals.
IR	Instruction Register	11	Holds instruction code
InpR	Input Register	4	Holds input data
OutR	Output Register	4	Holds output data
R0, R1, R2, R3	General Purposed Registers	4	Holds operands and other data

Memories

In RISCQ there is two memories which are instruction and data memories. Each has read enable and data inputs. Data memory has also write enable input.

Instruction Memory (32x11)
Data Memory (32x4)

Common Bus System

Common bus system will be responsible for data flow and provide data transfer between register and/or memories.

So after all; Memories and Registers in the BUS system looks like that;

Arithmetic and Logic Unit

In ALU, arithmetic and logical operations will be held. Its block diagram like that;

The ALU supports following operations;

Actually the ALU configrated like that;

Instruction set and micro-operations table

Instruction Set

Control functions and Microoperations

Control Unit

Control unit processes instructions to direct the micro-operations for computer's memories, registers and arithmetic/logic unit. Control unit consists of decoders and a number of control logic gates. It should produce operation signals and time periods for fetching, decoding and executing the instructions.

Control Unit Figure;