Fast Data Transfer Rates; Aha-3940; Aha-3940W; Maximum Offloading Of The Host Cpu - Adaptec AHA-3940 User Manual

Fast Data Transfer Rates

AHA-3940

Up to 20.0 MBytes/sec synchronous data rate for two Fast 8-bit
SCSI channels
Up to 6.0 MBytes/sec asynchronous SCSI data rate for each of
the two SCSI channels

AHA-3940W

Up to 40.0 MBytes/sec synchronous data rate for two Fast
16-bit SCSI channels
Up to 12.0 MBytes/sec asynchronous SCSI data rate for each of
the two SCSI channels

Maximum Offloading of the Host CPU

Onboard RISC sequencer (SCSI PhaseEngine processor) auto-
mates SCSI protocol
Low SCSI processing overhead
Bus Master DMA implementation
Task scheduling and message-based communication

Disk Array Support

Able to boot from any drive on the SCSI bus
Extensive support for leading disk array vendors

Fast SCSI-2 Implementation

Concurrent support for Fast SCSI synchronous and asynchro-
nous devices
Concurrent support for 8-bit and 16-bit SCSI devices
(AHA-3940W only)
Single-ended output
Scatter/Gather
Disconnect/Reconnect
Fully multitasking/multithreading
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AHA-3940/3940W User's Guide
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Stock Number: 510600-00, Rev. A
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Current Date: 8/24/94
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Page: 1-5
ECN Date: 08/30/94
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Introduction
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