4.1 Control/Sense Commands

When the Immed bit is "0," the power condition state becomes Active_Wait, and the spindle motor is started after the NOTIFY (ENABLE SPINUP) primitive has been received. Then, when the disk drive enters the ready state, the status byte is reported and command execution is completed. In this case, the INIT has no means of detecting the timing when the power condition state becomes Active_Wait, and there are no limitations on the time period in which the system waits the NOTIFY (ENABLE SPINUP) primitive. Therefore, the INIT needs to issue the NOTIFY (ENABLE SPINUP) primitive after this command is issued and before the spindle motor becomes ready.

b.In the case of the stop specification ("Start" bit = "0")

When the Immed bit is "1," after the power condition state becomes Stopped, instructing the drive to stop the spindle motor is sufficient so that the GOOD status is reported and command execution is completed.

When the Immed bit is "0," after the power condition state becomes Stopped and the spindle motor enters the Stopped state, the status byte is reported and command execution is completed.

C141-C013

179

Page 183
Image 183
Fujitsu MBA3147RC, MBC2036RC, MBC2073RC, MBA3300RC, MBA3073RC specifications Control/Sense Commands