| 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 |
Hello,
This is about a VME300 board but it can be related to a KAV30. A
customer observed that DMA done by EZDRIVER could last 18 microsec
causing other boards accessing the DPRAM a bus error. He said
that the specs should give 6 microsec. for DMA bursts at most.
My question is how to decrease this DMA bus timing by the EZDRIVER
for other boards not experiencing fatal bus errors ?
Thank you in advance.
Best regards,
Philippe
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 146.1 | bad luck... | EICMFG::KAV30_SUPP | Thu Dec 08 1994 13:30 | 9 | |
Hi Phillipe,
that is - unfortunately - a known problem, and if you use ELN and
DECnet there is nothing you can do. 6 microseconds is the chip spec,
18 microseconds is what the EZdriver does.... You could ask the
ELN guys if they have a solution/fix/workaround... we have not heard of
anything in this direction....
Thomas
| |||||
| 146.2 | see VAXELN conference | SWTHOM::VOUTERS | Mon Dec 12 1994 14:42 | 2 | |
Posted in VAXELN Notesfile.
Philippe
| |||||