| ??? 04/15/05 10:10 Read: times Msg Score: +1 +1 Informative |
#91613 - Natsemi appnote or CORDIC Responding to: ???'s previous message |
While I haven't tried this solution, I think it could work:
- take the logarithm, base 2. Look for an appnote in Natsemi for their COP8 uCs where is explained how to do it easily - add the result - take the antilogarithm (base 2) of the previous result. Maybe the appnote has some hint about this. Another way: square it by using the appropriate CORDIC algorithm. I studied it years ago and I can assure you it can be done, but don't remember the way it worked. All I can tell you is a table driven algorithm, used in (at least) all old HP calculators and in the Cyrix coprocessors for PCs in the 90's. Regards, Enrique. |
| Topic | Author | Date |
| Fast Square. | 01/01/70 00:00 | |
| Square dancing | 01/01/70 00:00 | |
| table lookup??? | 01/01/70 00:00 | |
| code & algorithm | 01/01/70 00:00 | |
| 16*16 bit is slower than what I want. | 01/01/70 00:00 | |
| How fast? | 01/01/70 00:00 | |
| Re: How Fast | 01/01/70 00:00 | |
| ... probably impossible in 15 cycles | 01/01/70 00:00 | |
| why cycles ? | 01/01/70 00:00 | |
| Re: Microseconds | 01/01/70 00:00 | |
| table lookup | 01/01/70 00:00 | |
| Natsemi appnote or CORDIC | 01/01/70 00:00 | |
| Natsemi link to appnote | 01/01/70 00:00 | |
| (a+b)^2=a^2+2*a*b+b^2 | 01/01/70 00:00 | |
| Thats Slow. | 01/01/70 00:00 | |
| faster need hardware | 01/01/70 00:00 | |
| How fast do you need? | 01/01/70 00:00 | |
| Re: How Fast. | 01/01/70 00:00 | |
| Just? | 01/01/70 00:00 | |
| Incorrect | 01/01/70 00:00 | |
| Correct? | 01/01/70 00:00 | |
| Whooooopa... Sorry. | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| I tried... | 01/01/70 00:00 | |
| optimum? table driven | 01/01/70 00:00 | |
| Jan metod | 01/01/70 00:00 | |
| Hardware? | 01/01/70 00:00 | |
| CPLD? | 01/01/70 00:00 | |
| SILabs f12x does it in hardware | 01/01/70 00:00 | |
| Re: SiLabs F12x | 01/01/70 00:00 | |
| Price | 01/01/70 00:00 | |
| F12x price | 01/01/70 00:00 | |
| F12x MAC | 01/01/70 00:00 | |
| provided in the datasheet | 01/01/70 00:00 | |
| Just out of interest | 01/01/70 00:00 | |
| clarification | 01/01/70 00:00 | |
| CPLD? | 01/01/70 00:00 | |
| too expensive | 01/01/70 00:00 | |
| Absolute rubbish Oleg | 01/01/70 00:00 | |
| explain | 01/01/70 00:00 | |
| your right | 01/01/70 00:00 | |
| especially for those... | 01/01/70 00:00 | |
| I need to say this.... | 01/01/70 00:00 | |
| By the way..... | 01/01/70 00:00 | |
| just a demo | 01/01/70 00:00 | |
| Hang on. | 01/01/70 00:00 | |
| Oh bollocks | 01/01/70 00:00 | |
| Well oleg | 01/01/70 00:00 | |
| Please check my answer. | 01/01/70 00:00 | |
| Here you go | 01/01/70 00:00 | |
| You're having me on. | 01/01/70 00:00 | |
| Pascal? | 01/01/70 00:00 | |
| Pascal? | 01/01/70 00:00 | |
| Why ? | 01/01/70 00:00 | |
| It was changed because,,, | 01/01/70 00:00 | |
| Its because | 01/01/70 00:00 | |
| For Jez | 01/01/70 00:00 | |
| For Michael | 01/01/70 00:00 | |
| simulation | 01/01/70 00:00 | |
| Re: Fast Square | 01/01/70 00:00 | |
| Prahlad, waithing for a conclusion | 01/01/70 00:00 | |
| just an exercise... | 01/01/70 00:00 | |
| Tricky | 01/01/70 00:00 | |
| Jez asked his cat, I asked my sheep | 01/01/70 00:00 | |
| Conclusion. | 01/01/70 00:00 | |
SPI EEPROM | 01/01/70 00:00 |