| ??? 02/13/13 21:12 Read: times |
#189360 - and also a twisted ring network Responding to: ???'s previous message |
Oliver Sedlacek said:
An alternative to a shared high speed bus is to use point-to-point links (as promoted by the old Transputer). You would arrange your processors in a grid and each processor would have a link to its nearest neighbour, often thought of in terms of North, East, South and West. Not many processors have four UARTs, so this can be a deal breaker. Perhaps better suited to 8051 / Small uC is what I've called a twisted ring. All uC are connected in a ring, using 9 bit UARTS, and all controllers look for an EDGE on the 9th bit. They then extract an agreed count, and replace with replies, and move the signal edge as they do so. So the 9th bit looks just like a twisted ring counter, as it moves along the loop. This is well suited to similar-slaves, and modern 8051 can do this to > 1MBd Address is automatic, by location in the loop, and even the total count present can be found by checking how far the 9th bit moved. You also know the slaves are awake, and not crashed, every transaction. |
| Topic | Author | Date |
| Multi-CPU designs | 01/01/70 00:00 | |
| Commonly Done | 01/01/70 00:00 | |
| Fun with network protocols | 01/01/70 00:00 | |
| and also a twisted ring network | 01/01/70 00:00 | |
| Please explain a bit more | 01/01/70 00:00 | |
| more details | 01/01/70 00:00 | |
I'd use I²C | 01/01/70 00:00 |