IOP16 Assembler

Design a CPU - Assembler

• The CPU has an Assembler
• The Assembler is written in Python 3
  • Python code is located here
• There's also a Windows executable if you don't have Python 3 installed on your computer
  • Executable located here

Assembler - Windows executable

• Windows executable is in this folder
• Useful for people who don't have Python 3 installed
• Compiled to executable using

pyinstaller --onefile pyAssemble_cpu_001.py

Input fileName.csv

• Input file is tightly constrained in CSV file
  • Input File Header has to be

['LABEL', 'OPCODE', 'REG_LABEL', 'OFFSET_ADDR', 'COMMENT']

Memory Map File

• Optional File named: fileName_MMAP.csv
  • Memory map file Header has to be

#	['IO_ADDR','DIR','MNEUMONIC']

• IO_ADDR = 0XNN
• DIR = R, W, or RW
  • Ex: ['0X00','R','LED_RD']

Output files

• .mif file - Quartus II ROM Memory Initialization File
• .lst file - Listing file (with addresses)

Assembler Psuedo-opcodes

• NOP - No operation
• HLT - Halt (Jump to self)
• BEQ - Branch if equal (same as BEZ)
• BNE - Branch if not equal (Aame as BNZ)

Error Messages

• Error messages are pretty rudimentary.
• Dialog box notes that error messages are printed to the command window.
• The line with the error is printed as a list of the line.
• Missing labels are presented as a message.
• Only one error at a time is presented.

Documentation

• YouTube Video Series.
• Documentation slides are here (LibreOffice Impress Open document format).