USPIIi-1v Hardware Manual
E-2
Themis Computer
Hardware:
On the USPIIi-1v, CPU module, cables, peripheral devices are typical examples of hardware.
may:
A keyword indicating flexibility of choice with no implied preference.
LED:
Light-Emitting Diode
MII:
Medium Independent Interface
MMU:
Memory Management Unit.
NC or N/C:
Not Connected.
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 NV-RAM. 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 memory device which consists of executable code by
the UltraSPARC II
i
CPU. The Code is responsible for initialization of the hardware and booting the system to
bring up the Solaris operating system.
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 Specification, Revision 2.1, June 1, 1995. The
internal bus on the UltraSPARC-IIi is a PCI bus.
Physical Address:
An address that maps to real physical memory or I/O device space.
PIO:
Accesses by a Master on the primary bus to a Slave on the secondary bus. PIO is equivalent to
“Downstream.”
Probing:
A process implemented in the firmware and software to identify onboard hardware devices and add-
on cards on the PCI bus. The probing process creates the device-tree.
R0:
An abbreviation used to indicate “Read Zero.” When software attempts to read an R0 area, zero will be
returned. Writes to R0 are not permitted.
Read Cycle:
A VMEbus cycle used to transfer 1, 2, 3, 4, or 8 bytes from a Slave to a master.
Read-Modify-Write Cycle:
A VMEbus cycle used to read from, and then write to, a Slave location without
permitting any other Master to access that location during that cycle.
RED_state:
The
R
eset,
E
rror, and
D
ebug state of the UltraSPARC-II
i
processor. The UltraSPARC-II
i
enter
the RED_state when PSTATE.RED=1. Refer to Chapter 7, "Resets," for more information.
SME:
Sun Micro-Electronics
Software:
A collection of machine readable information, instructions, data and procedures that enable the
computer to perform specific functions. Typically stored on removable media.
Solaris:
The best known operating system from Sun.
TLB:
Translation Lookaside Buffer. A hardware cache that contains copies of recently used translations.
Separate TLBs reside both in the MMU and the IOM.
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