| ??? 11/03/05 16:07 Read: times |
#103271 - In that case I probably would not buffer Responding to: ???'s previous message |
The ribbon cable is standard FRC ribbon cable simillar to that used in ATA harddisks. The length will be 3 to 4 inches. This ribbon cable doesnt leave the box.
In that case I probably would not buffer, but I would recommend you use a derivative (SILabs, Philips LPC others) that allow configuring the port pins as push-pull. Alternatively you could possibly get by with pull-up resistors to increase the drive towards high. If the buffers you mention have input from the ribbon cable they will not make much of a difference. If you do not use a real PCB (4 layer) I think you must have a ground plane below the xtal and caps and a ground wire between xtal stuff and other things. I have zero experience with non-optimal PCBs. Erik |
| Topic | Author | Date |
| Signals encircling xtal. | 01/01/70 00:00 | |
| the issue | 01/01/70 00:00 | |
| Trace lengths and buffering. | 01/01/70 00:00 | |
| In that case I probably would not buffer | 01/01/70 00:00 | |
| Solid ground plane solves your problems | 01/01/70 00:00 | |
Thanks Kai. | 01/01/70 00:00 |