mark@wiley.UUCP (Mark Conrad) (11/06/87)
Hi,
I'm in search of a VME-VME repeater/adapter board to connect together
multiple VME cages. In my configuration, I have a master cage containing
a Sun 3 CPU acting as the system processor and interrupt handler, VME
peripherals, and some custom VME boards. In up to three slave cages
there will be more VME peripherals and more custom hardware.
The master cage needs to be connected to each of the slave cages via
a VME-VME Repeater/Adapter. Ideally, the repeater would have the following
features:
- The adapter needs A24 and A16 capabilty. A32 would be nice, but is
not necessary.
- The adapter should have D32 and D16 capability. I don't have a need
for D8 transfers at this time.
- Address translation is required. Because I have to rely on A24 for
most data transfers, my address space is limited. The board must
be able to allow windowing from from VMEbus into the address space of
the other VMEbus. Reads and writes are required in both directions.
- The adapter needs to provide a fairly transparent way to transmit
interrupts from the slave cages back into the master cage. The Sun
CPU in that cage will act as the interrupt handler for the entire
system. The Sun needs to determine the interrupt vector and level
of the interruptor in the remote cage. Interrupts levels should
be preserved, so that the priority of each interruptor is observed.
- The adapter in each of the slave cages needs to act as the bus
arbiter for that cage. Fixed arbitration on level 3 is fine.
- There are no throughput requirements at this time.
I would greatly appreciate any pointers, comments, or experiences you
have had with any vendors concerning VME-VME adapters.
Please email directly to me, and I will summarize to the net if there
is any intrest.
Thanks in advance,
Mark
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// Mark Conrad // {uunet,cit-vax,trwrb}!wiley!mark //
// TRW Inc. - CoyoteWorks // wiley!mark@csvax.caltech.edu //
// Redondo Beach, CA // //
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