Themis Computer
E-1
E
E
Glossary
E.1
Terminology
The terminology used in this manual generally follows industry conventions. The following list defines the
specific meanings of words and terms as used in this section.
A16:
Addressing on address line A[15..1], as specified in ANSI VME64 Specification.
A24:
Addressing on address line A[24..1], as specified in ANSI VME64 Specification.
A32:
Addressing on address line A[32..1], as specified in ANSI VME64 Specification.
A40:
Addressing on address line A[40..1], as specified in ANSI VME64 Specification.
A64:
Addressing on address line A[64..1], as specified in ANSI VME64 Specification.
Arbitration:
The process of assigning the data transfer bus to a Master or Slave.
ASI:
An abbreviation for “Address Space Identifier.”
Boot
: The process of initializing the hardware to execute and run an operating System such as Solaris 2.6.
CPCI:
Compact PCI. An adaptation of the PCI Specification for industrial and/or embedded applications
requiring a more robust mechanical form factor than desktop PCI applications.
CPI:
Cycles per Instruction. The number of clock cycles required to execute one instruction.
Device tree:
The OBP probing process constructs a hierarchal representation of the hardware devices that are
found on the bus, the host-bus being the root. The device tree includes several device nodes, (PCI bus is a
device-node).
DMA:
Accesses by a master on the secondary bus to a target on the primary bus. DMA is equivalent to
“Upstream.”
Firmware:
This is software which stays with the hardware usually in a PROM or similar device. Referred to
as OBP in IEEE 1275 standards. In the USPIIi-1v implementation, release version 3.10.x and later are
supported. This version comes with the motherboard. The user may upgrade the OBP to a newer version if
needed.
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