SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001The ten-byte CDB mode parameter header is defined in table 148.Table 148 — Mode parameter header(10)BitByte7 6 5 4 3 2 1 00 (MSB)MODE DATA LENGTH1 (LSB)2 MEDIUM TYPE3 DEVICE-SPECIFIC PARAMETER4 Reserved LONGLBA5 Reserved6 (MSB)BLOCK DESCRIPTOR LENGTH7 (LSB)When using the MODE SENSE command, the MODE DATA LENGTH field specifies the length in bytes of the followingdata that is available to be transferred. The mode data length does not include the number of bytes in the MODEDATA LENGTH field. When using the MODE SELECT command, this field is reserved.NOTE 44 Targets that support more than 256 bytes of block descriptors and pages may need to implement ten-bytemode commands. The mode data length field in the six-byte CDB header limits the returned data to 256 bytes.The contents of the MEDIUM TYPE field are unique for each device type. Refer to the mode parameters subclause ofthe specific device type command standard (see 3.1.12) for definition of these values. Some device types reservethis field.The DEVICE-SPECIFIC PARAMETER field is unique for each device type. Refer to the mode parameters subclause ofthe specific device type command standard (see 3.1.12) for definition of this field. Some device types reserve all orpart of this field.The Long LBA (LONGLBA) bit of zero indicates the mode parameter block descriptors are eight bytes long and havethe format described in 8.3.4.1 or 8.3.4.2. A LONGLBA bit of one indicates the mode parameter block descriptors aresixteen bytes long and have the format described in 8.3.4.3.The BLOCK DESCRIPTOR LENGTH field specifies the length in bytes of all the block descriptors. It is equal to thenumber of block descriptors times eight if the LONGLBA bit is set to zero or times sixteen if the LONGLBA bit is set toone, and does not include pages or vendor specific parameters, if any, that may follow the last block descriptor. Ablock descriptor length of zero indicates that no block descriptors are included in the mode parameter list. Thiscondition shall not be considered an error.190 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 208.3.4 Mode parameter block descriptor formats8.3.4.1 General block descriptor formatWhen the LONGLBA bit is set to zero (see 8.3.3), the mode parameter block descriptor format for all device typesexcept direct-access is shown in table 149.Table 149 — General mode parameter block descriptorBitByte7 6 5 4 3 2 1 00 DENSITY CODE1 (MSB)2NUMBER OF BLOCKS3 (LSB)4 Reserved5 (MSB)6BLOCK LENGTH7 (LSB)Block descriptors specify some of the medium characteristics for all or part of a logical unit. Support for blockdescriptors is optional. Each block descriptor contains a DENSITY CODE field, a NUMBER OF BLOCKS field, and aBLOCK LENGTH field. Block descriptor values are always current (i.e., saving is not supported). A unit attentioncondition (see 7.6 and SAM-2) shall be generated when any block descriptor values are changed.The DENSITY CODE field is unique for each device type. Refer to the mode parameters subclause of the specificdevice type command standard (see 3.1.12) for definition of this field. Some device types reserve all or part of thisfield.The NUMBER OF BLOCKS field specifies the number of logical blocks on the medium to which the DENSITY CODE andBLOCK LENGTH FIELDS apply. A value of zero indicates that all of the remaining logical blocks of the logical unit shallhave the medium characteristics specified.NOTES45 There may be implicit association between parameters defined in the pages and block descriptors. In thiscase, the target may change parameters not explicitly sent with the MODE SELECT command. A subsequentMODE SENSE command may be used to detect these changes.46 The number of remaining logical blocks may be unknown for some device types.The BLOCK LENGTH field specifies the length in bytes of each logical block described by the block descriptor. Forsequential-access devices, a block length of zero indicates that the logical block size written to the medium isspecified by the transfer length field in the CDB (see SSC).dpANS SCSI Primary Commands - 2 (SPC-2) 191
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