| ??? 06/22/05 09:36 Read: times |
#95565 - Dual Port Question Responding to: ???'s previous message |
****Bonus OT question******
With dual port memory - what would happen if cpu B is reading the same location as cpu A is writing?? *************************** Dual port memories that I have used have a built in feature of some bit flag registers that can generate an interrupt each way. So processor A writes to the A->B flag and interrupts processor B after it has setup the whole data packet it wishes to send across to the other processor. In similar manner processor B has an almost identical B->A flag that it can interrupt back to processor A after the reply area is written. It can be a good idea to reserve specific areas of the dual port memory to be used for A->B and the B->A transfer buffers. If this is done carefully then you never create a condition wherein one processor is writing the same location that the other is reading. Michael Karas |
| Topic | Author | Date |
| Two micro in the same box not same board | 01/01/70 00:00 | |
| Eh? | 01/01/70 00:00 | |
| Design decisions | 01/01/70 00:00 | |
| Connection Parallel or Serial. | 01/01/70 00:00 | |
| OT answer | 01/01/70 00:00 | |
| Dual Port Question | 01/01/70 00:00 | |
| Dual ports ive known and loved | 01/01/70 00:00 | |
| Good to see we know the pitfalls! | 01/01/70 00:00 | |
| DPM | 01/01/70 00:00 | |
| async DPM | 01/01/70 00:00 | |
| yeah but no but yeah.. | 01/01/70 00:00 | |
| biting clocks | 01/01/70 00:00 | |
| Biting clocks | 01/01/70 00:00 | |
| Biting clocks | 01/01/70 00:00 | |
| Forget this "clock biting" | 01/01/70 00:00 | |
Re: Forget clock biting. | 01/01/70 00:00 |