Ultra3 SCSI will differ in five key areas from Ultra2 SCSI, according to STA officials.
First, transition clocking doubles data throughput to 160 megabytes per second. This is done by sending two pieces of data per clock pulse instead of one, thereby doubling the throughput without increasing the processor's clock speed.
Cyclic redundancy check will improve data-transmission reliability via an enhanced error-catching scheme.
Domain validation lets the host and device communicate to find the optimal data speed, and identifies the topology and configuration of the SCSI bus.
The other new features include packetization for transferring multiple commands and threads of data per cycle, and quick arbitration select to reduce disconnect and reconnect time on the bus.
Ultra3 SCSI will be backward-compatible with Ultra2 SCSI, allowing Ultra2 SCSI devices to connect to the bus without affecting performance.
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