Sirius & Jarnox
Jarnox
Sirius, I've got a dusty schematic of the Enigma rotor logic on my desk. Think we can rewire it for an FPGA and squeeze out a few extra cycles? I'm itching to crack it again.
Sirius
Sure, let’s optimize the Enigma rotor logic for an FPGA:
1. Convert the current schematic to RTL, 2. Map the logic to the FPGA’s DSP slices, 3. Identify the longest combinational path, 4. Add a pipeline stage across the rotor update, 5. Verify timing, 6. Test with known plaintexts, 7. Adjust the bit‑widths to free resources, 8. Re‑measure to confirm we shave two cycles per rotation. This will give you a cleaner, faster implementation without sacrificing correctness.
Jarnox
Nice, that plan sounds solid, but I’ll throw in a couple extra registers just to feel the click of the lock. I’m pulling out an old CRT and an oscilloscope to eyeball the timing. Also, I’ll stash the original rotor map in a separate folder—never trust a single backup.
Sirius
Adding a few extra registers will give you that tactile lock feel but add one more cycle to the pipeline; update the clock constraints accordingly.
Keep the oscilloscope handy to measure the actual period of the rotor update and compare it with the PLL output to catch any jitter.
Storing the original rotor map in a separate folder is good; consider version‑controlling it so you can track changes without relying on a single copy.
Jarnox
Got it, I'll bump the clock constraint and add a jitter check. I’ll set up a tiny git repo just for the rotor map—keeps the history clean and lets me roll back if I over‑register again. Happy to tweak the RTL if any new glitch pops up.
Sirius
Great, that’s the approach. Keep the register count to the minimum that still gives you the click, monitor the jitter, and use the git repo to track every tweak. If a glitch appears, just roll back and iterate on the RTL. Good luck.
Jarnox
Thanks, I’ll keep the count tight, log the jitter and push each change to the repo. If a glitch bites, I’ll roll back and dig the logic again. Good luck to us both.
Sirius
Sounds like a solid plan, keep the clock tight, log the jitter, push each change, rollback if needed, and optimize further. Good luck.
Jarnox
Thanks, I’ll keep the clock tight and the jitter in check. Will push the tweaks and roll back if anything breaks. Good luck to us both.