[Search for users]
[Overall Top Noters]
[List of all Conferences]
[Download this site]
| Title: | VAX on VMEbus: KAV30 |
| Notice: | Could have been as fast as 68K but its a VAX! |
| Moderator: | CSSVMS::KAV30_SUPP |
|
| Created: | Thu Apr 18 1991 |
| Last Modified: | Fri Aug 02 1996 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 159 |
| Total number of notes: | 645 |
60.0. "Arbitration failure in multi-master applications" by GOBANG::LEMMER () Mon Jul 20 1992 12:53
In a multi-master configuration (that is, several cpu's like KAV30 or
others on the VMEbus compete about bus mastership) and at high
temperature (> 45�C ) without forced cooling (which is not
recommended!) on some modules the arbitration logic may fail.
This could cause the application to hang or crash. By analyzing
the VMEbus with a logic analyzer strange behaviour on the
BGIN/BGOUT lines can be observed. This is caused by meta-stability
of the arbitration logic.
To prevent this the PAL was changed, the fix is implemented on
Rev A04 and B02 of all module 'flavours'. For details of the
ECO see note 8.x.
Thomas
| T.R | Title | User | Personal
Name | Date | Lines
|
|---|