GLOSSARY
DMA------------------------------- Direct Memory Access transfer. An I/O transfer conducted by a device
controller which accesses memory directly and, as a result, can transfer a
large volume of data without requesting a processor interrupt after each
unit amount. Contrast with programmed I/O (PIO) transfer.
DTB------------------------------- Data Transfer Bus. The lines on a VME backplane that control and
transfer data throughout the backplane.
DTR-------------------------------- RS-232 line indicating, Data Terminal Ready
FIFO ------------------------------- A data storage method; First In First Out. Also refers to the specific
storage area; Transmit FIFO, Interrupt FIFO, etc.
foreign message ------------------ A message that is in (passing through) a node other than the one of
origin.
frame------------------------------ An organized finite stream of data moving through a network that
includes pertinent and overhead transmission control and management
data. Frame length is dynamically sized from 4 to 128 bytes.
GND------------------------------- RS-232 Ground line.
insertion latency ------------------ The time required for a GT200 card to insert data values into outgoing
frames and remove data values from incoming frames.
loopback--------------------------- A method of transmitting to the same node’s receivers for testing
purposes. Applies to both fiber optic and wire media. Also, a test that
loops the outgoing signal back to its source.
MAC------------------------------- Media Access Control. A hardware address that uniquely identifies each
node of a network.
master------------------------------ A functional module that initiates VME cycles to transfer data between
itself and a slave module.
native message-------------------- A message that is received by the node of origin.
pass-through latency ------------- The time required for a GT200 card to process an incoming frame and
retransmit it on the network.
point-to-point topology---------- A network topology in which one node connects directly to another node.
Copyright 2005
GLOSSARY-2
GT200 VME Hardware Reference
Содержание GT200 VME
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