SCSI-1
Asynchronous or synchronous transfers up to 5
megabytes per second, below defines how it is used in the different generations of the
SCSI standards
SCSI-1
8 bit SCSI, Single-ended open collector drivers with
Asynchronous transfer for all commands and data transfers. Bipolar technology for the
drivers and receivers, bus DC loads a major consideration, passive termination.
SCSI-2
8 bit SCSI asynchronous commands with Synchronous
data transfer rates up to 5 megabytes per second. Bipolar technology with Open collector
or active negation single ended bus transceivers, passive or active termination, and
Differential (Now called HVD – High Voltage differential) bus transceivers based on
EIA 485 allowed in SCSI-2.
SCSI SPI (SCSI Parallel Interface)
8 bit SCSI asynchronous commands with Synchronous
data transfer rates up to 5 megabytes per second. CMOS technology with Open Drain or
active negation single ended bus transceivers, passive or active termination, and
Differential (Now called HVD – High Voltage differential) bus transceivers based on
EIA 485 allowed in SCSI SPI.
SCSI SPI-2 (SCSI Parallel Interface)
8 bit SCSI asynchronous commands with Synchronous
data transfer rates up to 5 megabytes per second. CMOS technology with Open Drain or
active negation single ended bus transceivers, active termination, LVD (Low Voltage
Differential) and Differential (HVD – High Voltage differential) bus transceivers
based on EIA 485 allowed in SCSI SPI-2.
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