Nanoprocessor-Design/NanoProcessor_UsageGuide(Improved version).txt at main · codevector-2003/Nanoprocessor-Design · GitHub

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Nano Processor (Improved Version) - Usage Guide and Instructions
==================================================================

Overview:
---------
This document provides the practical operation instructions, reset mechanisms,
LED and 7-segment display mappings, and the expected behavior of the circuit
described in the Improved Nano Processor VHDL design.

1. RESET BUTTON INSTRUCTIONS
-----------------------------
- Reset (Input: Reset):
    * Purpose: Resets the Program Counter and halts current instruction flow.
    * Usage: Pulse high ('1') for a short time (e.g., 10 ns), then return to low ('0').

- Register Reset (Input: Register_Res):
    * Purpose: Clears all the registers (R0–R7) in the Register Bank.
    * Usage: Pulse high ('1') at the beginning of operation for proper initialization.

2. CLOCK SIGNAL
----------------
- Clk_in (Input: Clock Signal):
    * Main clock input for processor execution.
    * A slower clock (slow_clock) is generated internally.

3. LED SIGNALS (Output: LED[3:0])
----------------------------------
- The 4-bit LED output reflects the content of Register R7.
- Example: If R7 = 1001, the LEDs will light up corresponding to binary 1001.

4. SEVEN SEGMENT DISPLAY
--------------------------
- Display (Output: 7 bits): Output lines for the 7-segment display driver.
- Anode (Output: 4 bits): Only the first digit (right-most) is enabled ("1110").
- The displayed value corresponds to the content of Register R7 (D_7).

5. INSTRUCTION SET AND EXPECTED BEHAVIOR
-----------------------------------------
- The instruction set is 13-bit wide and includes:
    OPCODE | DEST_REG | SRC_REG | IMM/ADDR

- Supported Instructions:
    * MOV: Move immediate to register
    * ADD: Add contents of two registers
    * NEG: Subtract content of two registers (via control signal)
    * CMP: Compare two register values
    * MUL: Multiply two register values
    * SFT: Shift bits in a register (left/right)
    * LOG: Logical operations (AND, OR, XOR)
    * JZR: Jump if zero

- Instruction Example:
    * "0101110000001": MOVI R7, 1
    * Executed by fetching operands, decoding via Ins_Decoder, processing through ALU/Multiplier/Comparator/Logical Unit as needed, and updating the register.

6. GENERAL USAGE INSTRUCTIONS
------------------------------
- Power on system and apply a clock signal.
- Apply a short high pulse to both Reset and Register_Res.
- Program ROM will begin sequential instruction execution.
- Monitor outputs via LED and 7-segment display to verify operation.
- Use simulation (e.g., testbench) to validate and observe system behavior.

For more information, refer to simulation diagrams or individual component testbenches.