DEC 4000 AXP Service Manual page 217

CSR
See control and status register.
cycle
One clock interval.
data alignment
An attribute of a data item that refers to its placement in memory (therefore its
address).
data bus
A bus used to carry signals between two or more components of the system.
D-bus
On the DEC 4000 AXP system, the bus between the 21064 CPU chip and the
''D-bus micro'' and the serial ROMs.
D-cache
Data cache. A high-speed memory reserved for the storage of data. Contrast with
I-cache.
DC-DC converter
A device that converts one DC voltage to another DC voltage.
deassert
To cause a signal to change to its logical false state.
DECchip 21064 microprocessor
The CMOS-4, Alpha AXP architecture, single-chip processor used on Alpha AXP
based computers.
DECnet
Networking software designed and developed by Digital. DECnet is an
implementation of the Digital Network Architecture.
DEC OSF/1 operating system
A general-purpose operating system based on the Open Software Foundation
OSF/1 1.0 technology. DEC OSF/1 V1.2 runs on the range of Alpha AXP systems,
from workstations to servers.
Glossary–7