DEC RK07 drive interface specs wanted

From: Brad Parker <brad_at_heeltoe.com>
Date: Fri May 14 08:06:39 2004

Jochen Kunz wrote:
...
>> For older disk controllers, this approach is likely to be hard because
>> touching CSRs causes actions to take place,
>Programm and wire the CPLD so that it generates an interrupt to the PIC
>when the register file is touched. Issue a vector along with the
>interrupt that tels the PIC which CSR was touched.

yes, but you also need to worry about back-to-back accesses by the
unibus cpu. the 'card micro' needs to be able to get in and do it's
magic between the unibus cpu's two cycles...

i.e. bus locking...

-brad
Received on Fri May 14 2004 - 08:06:39 BST