Ultra3 SCSI **
Data transfers 160 megabytes per second, first defined in SPI-3
SCSI SPI-3 (SCSI Parallel Interface)
16 bit SCSI asynchronous commands with Synchronous data transfer
rates up to 160 megabytes per second. LVD (Low Voltage Differential allowed in SCSI SPI-3.
There are a lot of changes with SPI-3; High voltage differential (HVD SCSI) and the 32 bit
data bus with the Q cable are obsolete, clocking is defined for LVD on both the rising and
falling edges of the REQ/ACK clock – Double Transition (DT) defined, Cyclic
Redundancy Check (CRC) defined, Domain Validation defined in SPI-3 and SPC-x, Packetized
defined and Quick Arbitration Defined. **
** Ultra160/m is a specific implementation of Ultra3 that
includes Fast-80DT, CRC and Domain Validation. Ultra160/m was developed by a group of SCSI
suppliers and customers; it is not a STA recognized term.
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