| ??? 06/15/05 23:45 Read: times |
#95050 - Combined Watchdogs Responding to: ???'s previous message |
Kai Klaas said:
By the way, why not combining both watchdogs, the internal and the external one? Ever done this? I have done this for debug purposes with the Triscend E5 (now Zylogic ZE5): The trouble with an external watchdog (WD) on an E5 is that it doesn't get "kicked" during JTAG downloads, or while the chip is stopped by JTAG debug - so an external WD disable is required for these situations. Enabling the internal WD in these circumstances allows the WD functionality and JTAG download & debug to be used together. As I mentioned earlier, the trouble with the E5's internal watchdog is that it has to be explicitly enabled by the software - so it can't recover from situations where the software fails to start properly. This is a particular problem for the E5, since the startup process has to load the FPGA config before the software can even start running... |
| Topic | Author | Date |
| AT89C51RD2 without supervisor IC | 01/01/70 00:00 | |
| RC is never good | 01/01/70 00:00 | |
| watchdog ad absurdum | 01/01/70 00:00 | |
| and uses a bunch of pins | 01/01/70 00:00 | |
| wd | 01/01/70 00:00 | |
| paranoia revisited - wd 2 | 01/01/70 00:00 | |
| when the full story | 01/01/70 00:00 | |
| WD3 | 01/01/70 00:00 | |
| if code run astray | 01/01/70 00:00 | |
| Has been discussed before | 01/01/70 00:00 | |
| External ones are better | 01/01/70 00:00 | |
| External ones are better in one respect | 01/01/70 00:00 | |
| Yes, but... | 01/01/70 00:00 | |
| Nope, never use an external when | 01/01/70 00:00 | |
| Exactly! | 01/01/70 00:00 | |
| Combined Watchdogs | 01/01/70 00:00 | |
| External better in another respect | 01/01/70 00:00 | |
| I'm using the internal and works well | 01/01/70 00:00 | |
| works well - how do you know | 01/01/70 00:00 | |
| who should test it? | 01/01/70 00:00 | |
| nobody | 01/01/70 00:00 | |
| the manufacturer should | 01/01/70 00:00 | |
| Design Verification | 01/01/70 00:00 | |
one off | 01/01/70 00:00 | |
| The meaning of "well" | 01/01/70 00:00 |