scsi interface specification - Plasmon

DRIVE COMMAND SETWRITE BUFFER (3BH)CSIB EXAMPLESGOOD Status:After a successful microcode download, the following 18 bytes of request sense data are returned:F0 00 00 00 00 00 00 F7 03 03 00 01 00 00 00 00 00 00This indicates that both RWS PCA's were successfully downloaded, but the RWS A PCA just requiredmore than one attempt. The drive internally will retry a failed RWS or DPC download.CHECK CONDITION Status:After a failed microcode download, the following 18 bytes of request sense data are returned:F0 00 00 00 00 00 00 F7 07 03 04 0A 00 00 00 00 00 00This indicates that three PCA's were scheduled. Both RWS PCA's downloaded successfully; however, theDPC PCA was attempted and failed because the EEPROM could not be erased.DRIVER PROGRAM NOTESThe following individual paragraphs cover specific details and are unrelated to one another:In all cases, the Data Download Mode must be successfully completed prior to the Drive Download Mode.The Data Download Mode is considered successfully complete when the drive returns GOOD status and asubsequent request sense obtains a command specific information LSB of FFH. Then and only then is thedrive ready to accept a Drive Download Mode WRITE BUFFER command.Once a Drive Download Mode WRITE BUFFER command is issued, any returned CHECK CONDITIONstatus nullifies the previous Data Download Mode operation. This means that the Drive Download ModeWRITE BUFFER command retry will never be successful if just the one command is re-issued. To attempta retry of an unsuccessful Drive Download Mode WRITE BUFFER command, the user must firstsuccessfully complete the Data Download Mode and then execute the Drive Download Mode WRITEBUFFER command.Immediately after sending out the very first WRITE BUFFER command, the expected value of thecommand specific least significant byte would be in the range of 2 through FDH. There is an exceptioncase. If a user has entered the Data Download Mode and the LaserDrive is already at the exact desiredseries code, the drive will return GOOD status but on a subsequent request sense, the command specificinformation least significant byte will be equal to FEH. This value indicates that no downloads are requiredand the driver program should abort the SCSI download attempt.If a user has entered the Data Download Mode and the Reload bit (as well as at least one PCA bit) isasserted, the drive checks to ensure that the attempt is truly a redundant download. If the user-chosenPCA is at a different firmware revision than the upgrade firmware revision contained in the SCSI downloadpackage, the drive will respond with a CHECK CONDITION status to the WRITE BUFFER command.97653978 HPage 127