CC-3Optimizing PerformanceAHA-2740W/2742W/2744W User’s GuideStock Number: 510647-00, Rev. A Page: C-3Print Spec Number: 492897-00Current Date: 8/3/94 ECN Date: 8/9/94AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAt t t tPerformance TipsThe AHA-2740W/2742W/2744W is designed to maximize the per-formance of your SCSI devices and computer. The following tipswill help you take full advantage of the host adapter's advanceddesign features.Enabling Synchronous NegotiationSynchronous Negotiation is enabled (set to yes) by default on theAHA-2740W/2742W/2744W. You should normally enable thisoption on the host adapter because most SCSI devices support it andbecause it allows data to be transferred faster on the bus. however,because a few SCSI devices (e.g., certain CD-ROM drives) do notsupport Synchronous Negotiation and may malfunction if theyreceive a request for it, you may want to disable Synchronous Nego-tiation for that particular device. See Device Configuration on page3-13.Note: Even when Synchronous Negotiation is disabled onthe host adapter, the host adapter will still switch to Syn-chronous mode if it receives a request from the SCSI device.Enabling Wide NegotiationWide Negotiation is enabled (set to yes) by default on theAHA-2740W/2742W/2744W. For each 16-bit SCSI device connectedto the host adapter, Wide Negotiation should normally be enabled toallow for 16-bit data transfer instead of 8-bit. See Device Configura-tion on page 3-13.Note: Even when Wide Negotiation is disabled on the hostadapter, the host adapter will still switch to Wide Negotia-tion if it receives a request for it from the SCSI device.
