| ??? 12/15/04 14:10 Read: times |
#83148 - to the above Responding to: ???'s previous message |
1)The master microcontroller definitely will be (~1 op. per clock). ... some faster slaves ....
2) What if i trow out the idea for single internal bus. I can use SPI for the slower devices. And to prepare a fast parallel bus (open collector with push-pull transmitter) for the faster devices. Ore something like that. 1) You stated "WILL use Atmel", I know of no Atmel chip with less than 6 clocks per instruction cycle. Also at 6 clocks you would need 30MHz to attain 300k and AFAIK the 6 clock Atmels go no faster than 20 MHz 2) The calculation of instruction cycles I showed above is just as valid for a bus with 2 nodes as for a bus with 32. Push-pull or '245 will not change the max attainable bus speed. again "WILL use Atmel" AFAIK does not give you Push_pull. Having worked in several countries in my career, I can appreciate your supplier situation; however, if only chip x is available, you must modify your requirements to something possible with chip x. Erik |
| Topic | Author | Date |
| Master / slave parallel bus | 01/01/70 00:00 | |
| suggestion | 01/01/70 00:00 | |
| info | 01/01/70 00:00 | |
| config ports | 01/01/70 00:00 | |
| serial parallel ? | 01/01/70 00:00 | |
| various | 01/01/70 00:00 | |
| atmel port 0 | 01/01/70 00:00 | |
| Port 0 as communicator | 01/01/70 00:00 | |
| Sorry, did not look | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| supplier.. | 01/01/70 00:00 | |
| speed | 01/01/70 00:00 | |
| go on | 01/01/70 00:00 | |
| to the above | 01/01/70 00:00 | |
| Re: to the above | 01/01/70 00:00 | |
| open collector push-pull no way | 01/01/70 00:00 | |
| open collector and upsh-pull | 01/01/70 00:00 | |
| push pull drive, OC receive | 01/01/70 00:00 | |
| How to post ASCII Art | 01/01/70 00:00 | |
| All in one chip! | 01/01/70 00:00 | |
| Why parallel ? | 01/01/70 00:00 | |
CAN or cannot | 01/01/70 00:00 |