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Source code


Name: 6809_6309_compatible_core
Created: Dec 23, 2013
Updated: Jul 31, 2014
SVN Updated: Jan 25, 2015

Other project properties

Category: Processor
Language: Verilog
Development status: Beta
Additional info: FPGA proven
WishBone Compliant: No
License: LGPL


A verilog, vendor independent, no cycle accurate MC6809/HD6309 compatible processor core.
- Execute all implemented opcodes
- Allow asnychronous memories
- >40 MHz clock


- Most instructions need less clocks than the original.
- Synthesizes in Lattice Diamond for the MachXO2 requiring ~1260 Slices (two-cycle multiplier) @ >40 MHz, tested, works.
- Synthesizes in XST for Spartan 2 using a bit less than 1200 Slices (fits in a XC2S100). Testing pending.
- Synthesizes in XST for Spartan 3 using ~1150 Slices, hw-multiplier. Testing on real FPGA pending.
- A simple vga text controller has been added, it needs some 70 SLICES and two blocks of ram of 4 kbyte each
for font and text. It only outputs b/w. It may be removed to make the code smaller.
- All 6809 opcodes have been implemented.
- 6309 opcodes have to be added