SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 20017.2.6.5 Parallel Interface T_L target descriptor formatTargets addressed using their parallel SCSI bus Target ID, and logical unit number are identified using the targetdescriptor format shown in table 22.Table 22 — Parallel Interface T_L target descriptor formatBitByte7 6 5 4 3 2 1 00 DESCRIPTOR TYPE CODE (E3h)1 Reserved NUL PERIPHERAL DEVICE TYPE2 Reserved3 Reserved4 (MSB)LOGICAL UNIT NUMBER11 (LSB)12 Vendor unique13 TARGET IDENTIFIER14272831ReservedDevice type specific parametersThe DESCRIPTOR TYPE CODE, PERIPHERAL DEVICE TYPE and NUL fields and the device type specific parameters aredescribed in 7.2.6.1.The LOGICAL UNIT NUMBER field specifies the logical unit with in the SCSI device addressed by the data in theTARGET IDENTIFIER field that shall be the target (source or destination) for EXTENDED COPY operations.The TARGET IDENTIFIER field specifies the SCSI target identifier to be used when this target descriptor identifies thesource or destination of an EXTENDED COPY operation.54 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 207.2.6.6 Identification descriptor target descriptor formatThe target descriptor format shown in table 23 instructs the copy manager to locate a target and logical unit thatreturns a device identification VPD page (see 8.4.4) containing an Identification descriptor having the specifiedCODE SET, ASSOCIATION, IDENTIFIER TYPE, IDENTIFIER LENGTH, and IDENTIFIER field values. The copy manager mayuse any N_Port, target identifier and logical unit number values that result in matching VPD field values to addressthe copy device. If multiple N_Port, target identifiers and logical unit number combinations access matching VPDfield values, the copy manager may use any combination to address the copy device and shall try other combinationsin the event that one combination becomes non-operational during the processing of an EXTENDED COPYcommand.Table 23 — Identification descriptor target descriptor formatBitByte7 6 5 4 3 2 1 00 DESCRIPTOR TYPE CODE (E4h)1 Reserved NUL PERIPHERAL DEVICE TYPE2 Reserved3 Reserved4 Reserved CODE SET5 Reserved ASSOCIATION IDENTIFIER TYPE6 Reserved7 IDENTIFIER LENGTH (n-7)8 (MSB)nn+1272831IDENTIFIERReservedDevice type specific parameters(LSB)The DESCRIPTOR TYPE CODE, PERIPHERAL DEVICE TYPE and NUL fields and the device type specific parameters aredescribed in 7.2.6.1.The contents of the CODE SET, ASSOCIATION, IDENTIFIER TYPE, IDENTIFIER LENGTH, and IDENTIFIER fields are specifiedin 8.4.4.The identifier length shall be 20 or less. If the identifier length is 20 there shall be no reserved bytes between thetarget descriptor parameters and the device type specific parameters.Some combinations of code set, association, identifier type, identifier length and identifier do not uniquely identify alogical unit to serve as a copy target device. The application client shall not send such combinations to the copymanager.dpANS SCSI Primary Commands - 2 (SPC-2) 55
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