scsi interface specification - Plasmon

LASER-DRIVE SCSI CHARACTERISTICSMESSAGE SYSTEM SPECIFICATIONIdentify 80H to FFHThese messages are sent by either the Initiator or the LaserDrive to establish the physical path connectionbetween an Initiator and the LaserDrive for a particular logical unit. The logical unit number addresses oneof up to eight physical or virtual devices attached to the LaserDrive as indicated in the following bitdefinitions.Bit 7Bit 6Bits 5-3Bits 2-0This bit shall be set to one to distinguish these messages from other messages.This bit is set to one by the Initiator to grant the LaserDrive the permission to initiatedisconnection. If this bit is zero, the LaserDrive shall not disconnect.ReservedThese bits specify a logical unit number in the LaserDrive.Only one logical unit number shall be identified for any one selection sequence; a second IDENTIFYmessage with a new logical unit number shall not be issued before the bus has been released (BUS FREEphase). The Initiator may send one or more IDENTIFY messages during a selection sequence. However,the logical unit number in any additional IDENTIFY messages shall be the same as the logical unit numberspecified in the first IDENTIFY message sent by the Initiator. The LaserDrive can support logical unitnumber 0.When sent from the LaserDrive to an Initiator during reconnection, an implied RESTORE POINTERSmessage shall be performed by the Initiator prior to completion of this message.97653978 HPage 15