Mano Basic Computer

Overview

The Mano Basic Computer is a theoretical computer architecture described by M. Morris Mano. It includes a central processing unit (CPU), random access memory (RAM), and an input-output bus. This project was undertaken by a team of 5 students as part of our Microcontrollers Architecture Course.

Modules

• 4bit_counter: Module for a 4-bit counter.
• 256_RAM: Module for a 256-byte Random Access Memory (RAM).
• AC_adderNlogic: Module for an Arithmetic and Logic Unit (ALU) adder and logic operations.
• AC_CONTROL: Module for controlling the Arithmetic and Logic Unit (ALU).
• AC_REG: Module for the Arithmetic and Logic Unit (ALU) register.
• AR_Control: Module for controlling the Address Register (AR).
• BUS_Control: Module for controlling the system bus.
• BUS_Selection: Module for selecting signals on the bus.
• Control_Unit: Module for the main control unit.
• D_ff_reset: Module for a D flip-flop with reset functionality.
• D_flipflop: Module for a D flip-flop.
• decoder: Module for a binary decoder.
• Decoder3x8: Module for a 3x8 binary decoder.
• DR_Control: Module for controlling the Data Register (DR).
• DR_REG: Module for the Data Register (DR).
• Encoder8x3: Module for an 8x3 binary encoder.
• main: Main module.
• Main_tb_behav.wcfg: Module for the testbench behavior configuration.
• mano_basic_comp3: Module for the Mano Basic Computer.
• Memory_control: Module for controlling memory operations.
• MUX8x3: Module for an 8x3 multiplexer.
• PC_Control: Module for controlling the Program Counter (PC).
• PC_REG: Module for the Program Counter (PC) register.
• seq_counter: Module for a sequential counter.
• Sequence_counter: Module for a sequence counter.
• timing_signals: Module for timing signals.

Instruction Set

Instruction	Hexadecimal Code	Description
AND	0XXX 8XXX	And memory word to AC
ADD	1XXX 9XXX	Add memory word to AC
LDA	2XXX AXXX	Load AC from memory
STA	3XXX BXXX	Store content of AC into memory
BUN	3XXX CXXX	Branch unconditionally
ISZ	7XXX EXXX	Increment and skip if zero
CLA	7800	Clear AC
CLE	7400	Clear E
CMA	7200	Complement AC
CME	7100	Complement E
INC	7020	Increment AC
SPA	7010	Skip next instruction if AC is positive
SNA	7008	Skip next instruction if AC is negative
SZA	7004	Skip next instruction if AC is zero
SZE	7002	Skip next instruction if E is zero

basic computer

Output signal