E-3
Themis Computer
E—Glossary
Hardware
: On the USPII
e
, the CPU module, cables, and peripheral devices are typ-
ical examples of hardware.
may
: A keyword indicating flexibility of choice with no implied preference.
LED
: Light-Emitting Diode.
LVD
: Low-Voltage Differential (Device).
IOM
: I/O Module.
ISR
: In-Service Reprogramming.
MHz
: Megahertz (millions of cycles per second, 10
9
cps); unit of frequency.
MII
: Medium Independent Interface.
MMU
: Memory Management Unit.
NA
or
N/A
: Not Applicable.
NC
or
N/C
: No Connection.
NVRAMRC
: Acronym for
N
on-
V
olatile
R
andom
A
ccess
M
emory
R
un
C
ommand.
This refers to the executable OBP script that is written in the NVRAM. Other text
information or binary data may exist in the NVRAM, but is not referred as
NVRAMRC.
OBP
: Acronym for
O
pen
B
oot
P
ROM. This refers to a program that consists of code
executable by the UltraSPARC-II
e
CPU. The Code is responsible for initialization
of the hardware and booting the system to bring up the Solaris operating system or
another operating system such as VxWorks.
PCB
: Printed Circuit Board.
PCI
: Peripheral Component Interconnect (bus). A high-performance 32- or 64-bit
bus with multiplexed address and data lines, as specified in the PCI Local Bus Spec-
ification, Revision 2.1, June 1, 1995. The internal bus on the Sun Microsystems
UltraSPARC-II
e
is a PCI bus.
PHY
: Physical transceiver or sublayer.
Physical Address:
An address that maps to real physical memory or I/O device
space.
PIO
: Programmed I/O. A method of accessing devices under UNIX as special files
(as opposed to mapping the physical address range to a process’s virtual address
space).
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