Timeline for 7 segment binary to hex
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Jan 29, 2018 at 11:48 | comment | added | Goswin von Brederlow | I tried Logic Friday (one of the tools listed as using espresso) before and it wouldn't optimize for the available gates. It seems to find a minimal form using espresso and then converts/expresses that minimal form using the gates you select. That is fine if you want only NAND or AND+OR. But if you have AND+NAND+OR+NOR+XOR it doesn't see a need to transform anything and won't use the extra gate types for a more optimal result. | |
| Jan 25, 2018 at 15:20 | comment | added | Dmitry Grigoryev | According to the man page, espresso does optimize, though it uses heuristics to simplify the task. | |
| Jan 25, 2018 at 15:09 | comment | added | Goswin von Brederlow | @DmitryGrigoryev I've searched before and I have never found a free logic optimizer yet that does more than just transform the POS or SOP to use different gate types. Nothing that actually optimizes. It's a NP hard problem I believe and quickly takes to long to find the optimal solution. So people don't try. It quickly becomes simpler to use a rom as lookup table (as suggested above). | |
| Jan 25, 2018 at 10:08 | comment | added | Dmitry Grigoryev | @GoswinvonBrederlow Good point, but it's a matter of search to find a logic optimizer which does what you want. | |
| Jan 25, 2018 at 9:42 | history | edited | Dmitry Grigoryev | CC BY-SA 3.0 |
added 229 characters in body
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| Jan 25, 2018 at 9:06 | comment | added | Goswin von Brederlow | That calculator only solves one output at a time and shows only one solution even if there are multiple. That means it can give solutions that have less terms in common between the outputs. I.e. use more gates than necessary. | |
| Jan 23, 2018 at 20:22 | comment | added | Dmitry Grigoryev | @ChrisStratton Frankly I don't see the benefit of posting the actual solutions here. | |
| Jan 23, 2018 at 19:08 | comment | added | Chris Stratton | This really sounds like a comment offering supporting advice, not an answer. | |
| Jan 23, 2018 at 14:14 | history | answered | Dmitry Grigoryev | CC BY-SA 3.0 |