SBS Technologies 466-1, Hardware Manual

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Model 466-1 Adapter
Glossary 81
Node I/O: Address space that accesses adapter CSR. This space is divided
into local node I/O and remote node I/O subspaces. Local node I/O accesses
I/O registers contained locally on each adapter card. Remote node I/O
accesses I/O VMEbus adapter card registers from the SBus.
nsec: Nanosecond. 1/1,000,000,000 of a second.
Octal: Octal notation. A numbering system that uses eight digits (01234567)
to denote a number. In this manual, octal numbers are preceded by 0
(standard C notation).
Open-drain: A bus driver or signal that is driven only low. Sometimes
referred to as open-collector.
Physical Address: The actual or machine address of an item or device.
PIO: Programmed I/O.
Programmed Interrupts: Interrupts caused by setting a flip-flop in one of the
adapter node I/O registers. The two types of programmed interrupts are the
PT (Programmed to Transmitter) interrupt and the PR (Programmed to
Receiver) interrupt.
Receiver: An adapter card that is not allowed to transmit messages across
the interface cable, thus preventing it from accessing the remote node I/O,
remote bus I/O and memory, or a remotely-installed Dual Port RAM card.
Remote: Pertaining to the system accessing either adapter card. Implies that
the resource is located at the other end of the adapter interface cable.
Remote Bus Input/Output: Any access to the I/O registers of devices that
are physically located in the remote system chassis (not the remote adapter
card).
Remote Bus Memory: Any access to the memory space in the remote
chassis. This may be a shared memory section, a device buffer, or any device
that responds to a memory access. This does not include Dual Port RAM
located on the remote adapter card.