Aaaa Aaaa Aaaa Aaaa Aaaa Aaaa Aaaa A A - Adaptec AHA-2740W User Manual

are loaded into memory at boot
time.
Differential
A term referring to the electrical
characteristics of the signals
used on the SCSI bus interface.
Differential signals occupy two
conductors with a positive (+)
and negative (-) polarity compo-
nent of the signal. This mini-
mizes the effect of common
mode signal noise and allows
the SCSI bus to operate reliably
over greater distances at a
higher speed.
Direct Memory Access
A mechanism that allows hard-
ware control of the transfer of
streams of data to or from the
main memory of a computing
system. The mechanism may
require setup by the host soft-
ware. After initialization, it auto-
matically sequences the required
data transfer and provides the
necessary address information.
Disconnect/Reconnect
Disconnect is the function that
occurs when a target releases
control of the SCSI bus, allowing
the bus to go to the Bus Free
phase. Reconnect is the function
that occurs when a target selects
an initiator to continue an opera-
tion after a disconnect.
DMA
See Direct Memory Access
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AHA-2740W/2742W/2744W User's Guide
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A A Stock Number: 510647-00, Rev. A
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A A Print Spec Number: 492897-00
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Current Date: 8/3/94
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EEPROM
Electrically-Erasable Program-
mable Read Only Memory. An
integrated circuit used to store
the host adapter configuration.
The data stored in the EEPROM
can be updated while it is
installed on the host adapter.
EISA
Extended Industry Standard
Architecture. A kind of com-
puter bus. EISA, an extension of
the 16-bit ISA bus standard,
allows expansion devices like
network cards, video adapters,
and modems to transfer data
across the PC bus 32 bits at a
time. This standard was intro-
duced in 1988.
EISA Configuration
The operation of configuring a
device on the EISA bus through
accessing registers in the device
by the host. This replaces the
method of using jumpers com-
monly found on ISA bus
devices.
EPROM
Erasable Programmable Read
Only Memory. An integrated
circuit used to store the host
adapter BIOS and firmware.
EZ-SCSI
See Adaptec EZ-SCSI.
Page: Glossary-3
ECN Date: 8/9/94
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Glossary
Glossary-3
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