Reset; Reset Sources; Power On Reset - IBM IC35L036UWDY10 - Ultrastar 36.7 GB Hard Drive Specifications

11.16 Reset

The Reset condition is used to clear all SCSI devices from the bus. This condition takes precedence over
all other phases and conditions. After a reset condition is detected and the reset actions are completed,
the drive returns to a 'SCSI bus enabled' state that allows the drive to accept SCSI commands.
This device uses the Hard reset option as defined in the SCSI-3 Parallel Interface Standard.

11.16.1 Reset Sources

There are four sources of resets detected by the drive:
Reset Name
Power-On Reset
Self-Initiated reset
SCSI Bus Reset
TARGET RESET
Message

11.16.2 Power On Reset

At Power On Reset (POR) the following bring-up operation is taken:
1. Validation of ROM and EEPROM
2. RAM test for internal RAM
3. Test and initialize HDC registers
4. RAM test for sector buffer
5. Start spindle motor (if Auto Spin up is enabled)
6. Calibration of actuator
7. Read/Write test for all heads
8. Validation of RAM code and data table (RDM, Log, Mode Page) from the reserved area
If Auto Spin up is disabled, steps 5 - 8 will be executed when the first START STOP UNIT command with
Start bit.
Faults detected before successful completion of the HDC section could prevent the drive from responding
to a selection.
Faults detected after the successful completion of the HDC section will be reported as CHECK
CONDITION status to the initiator on the first command issued after a fault is detected except for the
INQUIRY, REPORT LUNS and REQUEST SENSE command. The INQUIRY, REPORT LUNS and
REQUEST SENSE command will always be responded with a GOOD status. Detecting a fault during POR
will not terminate execution of the bring-up operation.
Reset Source
This is the signal generated by the hardware at initial power-on
This is a software-generated reset that occurs when a internal logic error is
detected by the microcode.
This is a reset generated when the SCSI bus control line RST goes active.
This is the reset generated by the TARGET RESET Message.
Ultrastar 146Z10 hard disk drive specifications
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