scsi interface specification - Plasmon

DRIVE COMMAND SET MODE SELECT (15H)MODE SELECT (15H)The MODE SELECT command provides a means for the Initiator to specify LaserDrive operationalparameters. The parameter settings can be determined with the MODE SENSE command. In autoconfiguringsystems, the MODE SENSE command should be issued before MODE SELECT to determinesupported pages, page lengths and other parameters.MODE SELECT Command (15H)BITBYTE7 6 5 4 3 2 1 000 MODE SELECT (15H)01 LUN 0 PF Reserved SP02 Reserved03 Reserved04 Parameter List Length05 ReservedPage Format (PF)A Page Format (PF) bit of one indicates that the MODE SELECT parameters are structured as pages ofrelated parameters. A MODE SELECT command received with the PF bit set to zero will only accept the 4byte header.Save Pages (SP)A Save Pages (SP) bit of zero indicates the LaserDrive will perform the specified MODE SELECToperation and not save any pages. Therefore, upon a subsequent reset or power cycle, these parametersmay be changed. An SP bit of one indicates that the LaserDrive will perform the specified MODE SELECToperation and save, to nonvolatile RAM, all the savable pages including any page changes sent during theDATA OUT phase.The LaserDrive rejects any MODE SELECT that attempts to change a parameter that is not changeable.The LaserDrive rejects a MODE SELECT that sends a parameter value out of the range supported by theLaserDrive. These command rejections cause the LaserDrive to return a completion status of CHECKCONDITION. The ILLEGAL REQUEST Sense Key and Invalid Field in Parameter List Error Code is set inthe Sense Data.Parameter List LengthThe Parameter List Length specifies the length in bytes of the MODE SELECT parameter list that istransferred from the Initiator to the LaserDrive. A Parameter List Length of zero indicates that no data istransferred. The LaserDrive accepts and validates mode select parameters up to the Parameter ListLength specified in the CDB and according to the Page Specific Parameter Length in each page header.Any multiple-byte parameter field not completely supplied is in error. The Sense Key is set to INVALIDREQUEST, the Error Code is set to Invalid Field in Parameter List and no pages are changed.The MODE SELECT parameter list shown in Table 28 contains a 4-byte header, followed by zero or morepages of parameters or an 8-byte block descriptor, followed by zero or more pages of parameters.If a MODE SELECT command is terminated with a completion status other than GOOD, the LaserDrivedoes not modify operating parameters.The contents of the media-type field is 02H. This indicates a WORM-media type. The default media typevalue of zero will also be accepted. However, any subsequent Mode Sense will always report Media Typeas 02.PLASMON L M S - LD 6100/LF 6600/LF 6602 SCSI INTERFACE SPECIFICATIONPage 68